Journal articles: 'Fin rays'

1

Stewart, Thomas A., Justin B. Lemberg, Natalia K. Taft, Ihna Yoo, Edward B. Daeschler, and Neil H. Shubin. "Fin ray patterns at the fin-to-limb transition." Proceedings of the National Academy of Sciences 117, no. 3 (December 30, 2019): 1612–20. http://dx.doi.org/10.1073/pnas.1915983117.

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The fin-to-limb transition was marked by the origin of digits and the loss of dermal fin rays. Paleontological research into this transformation has focused on the evolution of the endoskeleton, with little attention paid to fin ray structure and function. To address this knowledge gap, we study the dermal rays of the pectoral fins of 3 key tetrapodomorph taxa—Sauripterus taylori (Rhizodontida), Eusthenopteron foordi (Tristichopteridae), and Tiktaalik roseae (Elpistostegalia)—using computed tomography. These data show several trends in the lineage leading to digited forms, including the consolidation of fin rays (e.g., reduced segmentation and branching), reduction of the fin web, and unexpectedly, the evolution of asymmetry between dorsal and ventral hemitrichia. In Eusthenopteron, dorsal rays cover the preaxial endoskeleton slightly more than ventral rays. In Tiktaalik, dorsal rays fully cover the third and fourth mesomeres, while ventral rays are restricted distal to these elements, suggesting the presence of ventralized musculature at the fin tip analogous to a fleshy “palm.” Asymmetry is also observed in cross-sectional areas of dorsal and ventral rays. Eusthenopteron dorsal rays are slightly larger than ventral rays; by contrast, Tiktaalik dorsal rays can be several times larger than ventral rays, and degree of asymmetry appears to be greater at larger sizes. Analysis of extant osteichthyans suggests that cross-sectional asymmetry in the dermal rays of paired fins is plesiomorphic to crown group osteichthyans. The evolution of dermal rays in crownward stem tetrapods reflects adaptation for a fin-supported elevated posture and resistance to substrate-based loading prior to the origin of digits.

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Beacham, T. D., and C. B. Murray. "The effect of spawning time and incubation temperature on meristic variation in chum salmon (Oncorhynchus keta)." Canadian Journal of Zoology 64, no. 1 (January 1, 1986): 45–48. http://dx.doi.org/10.1139/z86-007.

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Variability in the number of dorsal, anal, caudal, pectoral, and pelvic fin rays, vertebrae, and gill rakers of early and late spawning stocks of Chehalis River chum salmon (Oncorhynchus keta) incubated under controlled water temperatures of 4, 8, and 12 °C was examined. The early spawning stock had fewer dorsal fin rays, more anal fin rays, fewer pectoral and pelvic fin rays, and fewer gill rakers than did the late spawning stock. Chum salmon originally incubated at 4 °C had the lowest number of dorsal fin rays, but the highest number of vertebrae and gill rakers. Chum salmon originally incubated at 8 °C had the highest number of anal fin rays, and those incubated at 12 °C had the highest number of pectoral fin rays. Meristic phenotypes had both a genetic and an environmental component.

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Román-Valencia, César, Carlos A. García-Alzate, Raquel I. Ruiz-C, C. Donald, and B. Taphorn. "A new species of Tyttocharax (Characiformes: Characidae: Stevardiinae) from the Güejar river, Orinoco river Basin, Colombia." Neotropical Ichthyology 10, no. 3 (September 2012): 519–25. http://dx.doi.org/10.1590/s1679-62252012000300004.

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A new Tyttocharax species from the Güejar River system, near the Macarena Mountains in Colombia is described. This is the first record for the genus from the Orinoco basin. The combination of the following characters distinguish Tyttocharax metae from its congeners: presence of bony hooks on the pectoral and caudal-fin rays; bony hooks on the anal-fin rays larger than those on the pelvic-fin rays; pectoral-fin rays i,5-6,i; presence of three unbranched dorsal-fin rays; absence of an adipose fin; four scales rows between the anal-fin origin and the lateral line; and four scale rows between the pelvic-fin and the lateral line. Ecological characteristics of the habitat of the new species are also presented.

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Vanegas-Ríos, James Anyelo, María de las Mercedes Azpelicueta, Juan Marcos Mirande, and María Dolly García Gonzales. "Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia." Neotropical Ichthyology 11, no. 2 (June 2013): 275–84. http://dx.doi.org/10.1590/s1679-62252013000200005.

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A new species of Gephyrocharax is described from the río Cascajales basin, a tributary of the río La Colorada, río Magdalena system, Colombia. The new species is distinguished from its congeners, exceptG. melanocheir, by the absence of an adipose fin in most specimens and by the possession of a lateral branched pectoral-fin ray in males with a distal fan-shaped structure with minute bony hooks and a dark blotch or a few scattered dark brown chromatophores along its branches. The new species differs from G.melanocheir by the absence of an intense black pigmentation at the base of the anterior five dorsal-fin rays, the number of vertebrae (40-41vs. 38-39), the frontals contacting each other anterior to the epiphyseal bar in adults (vs. the absence of contact), the posterior margin of the mesethmoid straight in its central portion (vs. strongly concave at this point), the pouch scale of mature males reaching caudal-fin ray 11 or the area between caudal-fin rays 11 and 12 (vs. reaching only to caudal-fin ray 10 or the area between caudal-fin rays 9 and 10), the number of minute terminal branches of the lateral branched pectoral-fin ray of mature males (60-88 vs. 28-54), a longer black lateral stripe along the body in males (reaching to the base of the caudal-fin rays vs. reaching the middle of the length of the caudal peduncle), and the snout length (28.3-31.8% HLvs. 22.2-28.0% HL). The diagnosis ofGephyrocharax is modified to include species with the adipose fin variably present

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5

Kai, Yoshiaki, Kenta Murasaki, Ryo Misawa, Atsushi Fukui, Eisuke Morikawa, and Yoji Narimatsu. "A new species of snailfish of the genus Paraliparis (Liparidae) from the western North Pacific, with a redescription of the poorly known species Paraliparis mandibularis." ZooKeys 968 (September 16, 2020): 143–59. http://dx.doi.org/10.3897/zookeys.968.56057.

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A new snailfish, Paraliparis flammeus, is described on the basis of 18 specimens collected off the Pacific coast of Tohoku District, northern Japan at depths of 422–890 m. The new species is distinguished from 28 species of Paraliparis described from the North Pacific by the following combination of characters: mouth oblique; uppermost pectoral-fin base below horizontal through posterior margin of maxillary; 60–63 vertebrae, 54–58 dorsal-fin rays, 50 or 51 anal-fin rays, six principal caudal-fin rays, and 17–20 pectoral-fin rays. A maximum likelihood tree based on 106 COI gene sequences (492 bp) of Paraliparis recovered a monophyletic group comprising P. flammeus, Paraliparis cephalus, and Paraliparis dipterus. Paraliparis cephalus is similar to P. flammeus in having an oblique mouth, but it has four caudal-fin rays (vs six rays) and the uppermost pectoral-fin base above a horizontal through the maxillary posterior margin. Paraliparis dipterus differs from P. flammeus in having a horizontal mouth, 12–14 pectoral-fin rays, and lacking pyloric caeca (present in P. flammeus). Paraliparis flammeus is most similar to the eastern North Pacific Paraliparis mento in having an oblique mouth and the uppermost pectoral-fin base below a horizontal through the posterior margin of the maxillary. However, P. flammeus differs from P. mento in having six caudal-fin rays (vs five rays) and greater preanal length (29.9–35.3% SL vs 26.7–28.5% SL). A poorly known species, Paraliparis mandibularis, previously known from only two specimens collected from Tosa Bay, southern Japan, is redescribed based on the holotype and seven newly collected specimens. It is also similar to the new species but has 27–30 pectoral-fin rays and a shorter pectoral-fin lower lobe (13.8–15.9% SL in P. mandibularis vs 16.7–23.4% SL in P. flammeus).

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KAI, YOSHIAKI, HIROMITSU ENDO, FUMIHITO TASHIRO, and NAOHIDE NAKAYAMA. "Two new species of snailfishes of the genus Careproctus (Cottoidei: Liparidae) from the western North Pacific Ocean with a range extension of Careproctus brevipectoralis." Zootaxa 4951, no. 2 (April 6, 2021): 361–71. http://dx.doi.org/10.11646/zootaxa.4951.2.9.

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Three snailfish species of Careproctus (Cottoidei: Liparidae), including two new species, are described from the deep Pacific Ocean off northern Honshu Island, Japan. Careproctus cyanogladius sp. nov., collected from the depths of 2,698–3,223 m, can be distinguished from congeneric species by having the following combination of characters: vertebrae 63; dorsal-fin rays 57–58; anal-fin rays 50; principal caudal rays 7; pectoral-fin rays 29–31; pectoral fin without a notch; uppermost pectoral-fin base below a horizontal through posterior margin of maxillary; pelvic disk oval; chin pores well separated; teeth simple; pyloric caeca 6–10; body pale blue or gray when fresh. The other new species, Careproctus orri sp. nov., collected from depths of 640–808 m, can be distinguished from congeneric species by having the following combination of characters: vertebrae 58–60; dorsal-fin rays 52–53; anal-fin rays 47–49; pectoral-fin rays 34–35; pectoral fin with a distinct notch; cephalic pores 2-6-7-2, chin pores single, unpaired; gill slit extending ventrally to 5th or 6th pectoral-fin ray; teeth strongly trilobed; peritoneum dark, stomach white. In addition, one specimen of Careproctus brevipectoralis Chernova, Thiel & Eidus, 2020 was newly collected from Japan, and is redescribed here in detail with comments on intraspecific variations.

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WANGHE, KUNYUAN, FAXIANG HU, MINHAO CHEN, and XIAOFENG LUAN. "Rhinogobius houheensis, a new species of freshwater goby (Teleostei: Gobiidae) from the Houhe National Nature Reserve, Hubei province, China." Zootaxa 4820, no. 2 (July 28, 2020): 351–65. http://dx.doi.org/10.11646/zootaxa.4820.2.8.

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A new freshwater goby, Rhinogobius houheensis, is described based on 40 specimens in a freshwater stream from the Houhe National Nature Reserve, Hubei Province, China. The new species can be distinguished from all its congeneric species by the following combination of characters: thee first dorsal fin rays VI, the second dorsal fin rays I/9-I/10; anal fin rays I/7-I/8; pectoral-fin rays 16–17; longitudinal scale series 37–40; transverse scales 12–14; predorsal scale series 0; and vertebrae counts 12+18=30. The first three spinous rays in the first dorsal fin are colored with two dark-blue stripes and one black spot in alive.

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Carvalho, Tiago Pinto, and Vinicius Araújo Bertaco. "Two new species of Hyphessobrycon (Teleostei: Characidae) from upper rio Tapajós basin on Chapada dos Parecis, central Brazil." Neotropical Ichthyology 4, no. 3 (September 2006): 301–8. http://dx.doi.org/10.1590/s1679-62252006000300001.

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Two new species of Hyphessobrycon are described from the upper rio Tapajós basin, Mato Grosso, Brazil. Hyphessobrycon melanostichos is distinguished from its congeners by the combination of a conspicuous longitudinal broad black band beginning on the posterior margin of orbit and reaching the tip of middle caudal fin rays, a distinct vertically elongate humeral spot, and 16 to 18 branched anal-fin rays. Hyphessobrycon notidanos is distinguished from its congeners by the combination of an elongate dorsal fin in mature males, a vertically elongate humeral spot, 2-4 maxillary teeth, iii,8 dorsal-fin rays, and 16 to 21 branched anal-fin rays.

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Zanata, Angela M., and Jane P. Serra. "Hasemania piatan, a new characid species (Characiformes: Characidae) from headwaters of Rio de Contas, Bahia, Brazil." Neotropical Ichthyology 8, no. 1 (March 2010): 21–26. http://dx.doi.org/10.1590/s1679-62252010000100003.

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Hasemania piatan is described from the upper rio de Contas drainage, Bahia, northeastern Brazil. It can be easily distinguished from its congeners by having 18 principal caudal-fin rays. The new species differs further from congeners by a combination of seven branched dorsal-fin rays, six branched pelvic-fin rays, anal-fin base not covered by scales, presence of only five infraorbitals, and presence of a humeral blotch. It also can be distinguished by having 10-13 branched anal-fin rays, 27-32 scales on longitudinal series, 10-12 circumpeduncular scales, and one to three maxillary teeth.

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10

KOVAČIĆ, MARCELO, SERGEY V. BOGORODSKY, and AHMAD O. MAL. "Two new species of Hetereleotris (Perciformes: Gobiidae) from the Red Sea." Zootaxa 4608, no. 3 (May 21, 2019): 501. http://dx.doi.org/10.11646/zootaxa.4608.3.5.

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Two new species of the gobiid genus Hetereleotris, H. aurantiaca sp. nov. and H. semisquamata sp. nov., are described from the Red Sea, the former from Saudi Arabia at Jeddah from the cave at depth of 14–16 m, and the latter from the southern Egypt from reef flat. Hetereleotris aurantiaca sp. nov. is distinguished from its congeners by having dorsal-fin rays VI + I,10; anal-fin rays I,9; pectoral-fin rays 14, all rays branched; pelvic-fin rays I,5, the fin separated and without frenum, 5th ray unbranched; anterior nostril with a long tube without process from the rim, posterior nostril a pore with erected rim; no tentacle above eye; posterior angle of jaws extending posteriorly to below posterior edge of pupil; no opercular spine; no mental frenum; pelvic fins longer than pectoral fins; squamation reduced to a few scales on caudal peduncle at caudal-fin base; no head canals; by presence, size and pattern of suborbital rows of sensory papillae; and orange head and yellowish orange body with five faint brown bars. Hetereleotris semisquamata sp. nov. is distinctive among its congeners by unique scale pattern (scales cycloid, the squamation reduced, tapering from caudal-fin base along lateral midline towards pectoral fin where nearly reaching its base) and by coloration (head and body whitish, with brown line from eye to end of upper lip, dark brown band across interorbital area and continuing obliquely from eye to corner of opercle, broad dark brown band below first dorsal fin continuing into fin, and moderately broad dark brown bar on caudal-fin base). Furthermore, it is characterized in having dorsal-fin rays VI + I,11, anal-fin rays I,10, pectoral-fin rays 16, and absence of head canals. In addition to descriptions of two species, a key to all species of Hetereleotris is provided. Hetereleotris psammophila is reported outside the Gulf of Aqaba for the first time.

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Chilton, D. E., and H. T. Bilton. "New Method for Ageing Chinook Salmon (Onchorhynchus tshawytscha) Using Dorsal Fin Rays, and Evidence if Its Validity." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 8 (August 1, 1986): 1588–94. http://dx.doi.org/10.1139/f86-197.

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Age of spawning chinook salmon (Oncorhynchus tshawytscha) was estimated using a combination of thin cross-sections from the dorsal fin rays and scales. The latter were used when freshwater growth could not be interpreted from fin rays. Fish of known age were used when available. Results were compared with ages obtained from scales only. Due to scale resorption a significant proportion of the older fish ages was undetected using only scales. Determinations of freshwater age from fin rays and from scales were in agreement 88.5 ± 8.7 to 92.3 ± 7.2% at the 95% confidence level. Thus, the fin ray method provided virtually the same freshwater age as did the scale method. Also, fin rays provided quite acceptable estimation of ocean age. It is recommended that managers use a combination of scales and fin rays to estimate the total age of spawning chinook salmon.

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Qin, TAO, KYAW WIN MAUNG, and XIAO-YONG CHEN. "Opsarius putaoensis, a new species of subfamily Danioninae (Actinopterygii, Cyprinidae) from the Irrawaddy River basin in northern Myanmar." Zootaxa 4615, no. 3 (June 14, 2019): 585–93. http://dx.doi.org/10.11646/zootaxa.4615.3.11.

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Opsarius putaoensis, new species, is described from the Mali Hka River, a tributary of the Irrawaddy River in northern Myanmar. For convenience of identification, Opsarius sensu Rainboth (1991) in Southeast Asia and India can be divided into two species groups based on the number of anal-fin rays: (1) the O. gatensis species group with more than 12 branched anal-fin rays, and (2) the O. barna species group with fewer than 11 branched anal-fin rays. The remaining species of the O. barna species group can be divided into two species subgroups by the presence or absence of barbels: (1) the O. chatricensis species subgroup without barbels, and (2) the O. barnoides species subgroup with one or two pairs of barbels. Opsarius putaoensis sp. nov. is a member of the O. chatricensis species subgroup together with O. chatricensis, O. arunachalensis, and O. barna. Opsarius putaoensis is most similar to O. chatricensis in overall appearance, including the number of vertical bars and color pattern, but it differs from O. chatricensis by the following characters: insertion of dorsal not reaching posterior end of pelvic fin base vs. reaching, vertical bars 6−7 vs. 7−8, vertical bars extending to the lateral line vs. not, branched anal-fin rays 9 vs. 10, branched pelvic-fin rays 7 vs. 8, branched pectoral-fin rays 12, rarely 11 vs. 11, circumpeduncular scales 12 vs. 14, and scale rows between dorsal-fin origin and lateral line 7−8 vs. 6. It is distinguished from all other species of the genus Opsarius by a combination of the following characters: barbels absent, dentary with parallel rows of tubercles, snout much shorter than eye diameter, mouth gape below anterior edge of orbit, body deep with depth 25.6−33.3% SL, pectoral and pelvic axial scales lobate, lateral line completely perforated with 35−38 scales, scale rows between dorsal-fin origin and lateral line 7−8, predorsal scales 15, circumpeduncular scales 12, branched dorsal-fin rays 7, branched anal-fin rays 9, branched pelvic-fin rays 7, insertion of dorsal not reaching pelvic-fin base, body with 6−7 vertical bars, extending to lateral line, and distal edge of dorsal fin black.

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HO, HSUAN-CHING, HIROYUKI MOTOMURA, HARUTAKA HATA, and WEI-CHUAN JIANG. "Review of the fish genus Epinnula Poey (Perciformes: Gempylidae), with description of a new species from the Pacific Ocean." Zootaxa 4363, no. 3 (December 12, 2017): 393. http://dx.doi.org/10.11646/zootaxa.4363.3.5.

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The gempylid fish genus Epinnula is reviewed and two species are recognized. The type species E. magistralis is considered restricted to the western Atlantic Ocean and a new species from the Pacific Ocean is described. The new species, Epinnula pacifica sp. nov., can be distinguished from E. magistralis by 17 or 18 dorsal-fin rays (vs. 15 or 16 in E. magistralis), 15 or 16 anal-fin rays (vs. 13 or 14), 247–268 total scales on lower lateral line (vs. 285–330), a deeper body, relatively high dorsal fin as reflected by the relatively long fin spines and rays, longer dorsal-fin and anal-fin bases, longer pectoral fin, and longer pelvic fin and pelvic spine.

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BENINE, RICARDO C., and GUILHERME A. M. LOPES. "A new species of Hyphessobrycon (Characiformes: Characidae) from rio Portuguesa, rio Orinoco basin, Venezuela." Zootaxa 1747, no. 1 (April 11, 2008): 61. http://dx.doi.org/10.11646/zootaxa.1747.1.3.

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A new species of Hyphessobrycon is described from tributaries of the río Portuguesa, río Orinoco Basin, Venezuela. The new species is diagnosed from congeners by the presence of two large hooks on each side of the anal fin in adult males (processes of last unbranched and first branched anal-fin rays), distal third of caudal-fin black except for its distal tips (which are hyaline), anal-fin rays v,19–21, and dorsal-fin rays ii,8. Comments on its generic status and putative relationships are provided.

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MATSUMOTO, TATSUYA, KEIICHI MATSUURA, and NAOTO HANZAWA. "A new species of nine-spined stickleback, Pungitius modestus (Gasterosteiformes, Gasterosteidae), from northern Honshu, Japan." Zootaxa 5005, no. 1 (July 23, 2021): 1–20. http://dx.doi.org/10.11646/zootaxa.5005.1.1.

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A new species of nine-spined stickleback, Pungitius modestus, is described based on the holotype and 17 paratypes (38.7–51.7 mm standard length) collected from the inland area of Yamagata Prefecture, northern Honshu, Japan. The new species is distinguished from the other species of Pungitius by the following combination of characters: 30–32 small unconnected lateral plates; dorsal-fin rays VIII–X (usually IX)+9–11; anal-fin rays 7–10 (usually 8); pectoral-fin rays 10; a short spiny dorsal fin base (26.5%–29.8% SL); the first spiny dorsal fin spine behind the pectoral-fin base; a long pre-anal fin (59.9%–67.4% SL); the anal-fin spine below the 1st–3rd dorsal-fin rays; a short pelvic-fin spine (6.3%–9.1% SL); a short anal-fin spine (4.1%–6.0% SL); a long caudal peduncle (14.3%–19.7% SL); no body markings; membranes of the dorsal-fin spines dark brown with black pigments; the entire male body, and soft dorsal and anal fins, becoming black in the breeding season; the anteroventral process of the ectocoracoid present; and the dorsal extension of the ascending process of the pelvis level with the dorsal-most actinost.

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BRITZ, RALF. "A new earthworm eel of the genus Chaudhuria from the Ayeyarwaddy River Drainage, Myanmar (Teleostei: Synbranchiformes: Chaudhuriidae)." Zootaxa 2571, no. 1 (August 19, 2010): 62. http://dx.doi.org/10.11646/zootaxa.2571.1.4.

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Chaudhuria ritvae, new species, from the lower Ayeyarwaddy River Drainage, southern Myanmar, is distinguished from C. caudata by a greater number of caudal vertebrae, shorter jaws, larger and broader ribs, neural arches of vertebrae without fenestration, absence of spots associated with base of dorsaland anal-fin rays, sparse body pigmentation consisting of only minute widely separated melanophores, and absence of pigmentation along pectoral-fin rays. It differs from its only other congener, C. fusipinnis, by having the dorsal and anal fins separate from the caudal fin, by a smaller number of dorsaland anal-fin rays, by a greater number of caudal-fin rays and by the presence of teeth on hypobranchial 3.

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HO, HSUAN-CHING, HIROMITSU ENDO, CHIA-LIEN LEE, and TAH-WEI CHU. "Bregmaceros anchovia sp. nov., a new codlet species from the western Pacific Ocean (Gadiformes: Bregmacerotidae)." Zootaxa 4801, no. 3 (June 19, 2020): 559–69. http://dx.doi.org/10.11646/zootaxa.4801.3.8.

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A new codlet species is described from Japan, Taiwan, Indonesia and Australia. It is distinguished from its congeners by having a pointed snout extending beyond jaws, a stripe of black dots above anal-fin base, a black vertical band on caudal-fin base, and the following combination of characters: ventral surface of head and abdomen devoid of melanophores; ventral portion of abdominal vertebrae with a pointed parapophysis and a blunt ventral post-zygapophysis; peritoneum, pyloric caeca, and intestine pale; dorsal-fin rays 46–52; anal-fin rays 47–55; pectoral-fin rays 15–17; principal caudal-fin rays 12‒14; caudal vertebrae 35‒39; total vertebrae 50–54. Furthermore, as a result of this study, Bregmaceros pescadorus Shen described from southwestern Taiwan is herein recognized as a junior synonym of Bregmaceros nectabanus Whitley.

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BINEESH, KINATTUMKARA, MUSALIYARAKAM NASHAD, K. V. ANEESH KUMAR, and HIROMITSU ENDO. "Glossanodon macrocephalus, a new argentine fish (Argentinidae) from the Arabian Sea." Zootaxa 4688, no. 2 (October 22, 2019): 289–94. http://dx.doi.org/10.11646/zootaxa.4688.2.9.

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A new species of argentinid fish, Glossanodon macrocephalus Bineesh & Endo, from the Arabian Sea, off the southwestern coast of India, is described on the basis of four specimens (129–164 mm SL). The new species clearly differs from its congeners in the following combination of characters: dorsal-fin rays 10–11; pectoral-fin rays 21–23; anal-fin rays 12–13; pelvic-fin rays 11–12; branchiostegal rays 5; gill rakers on first arch 30–36; vertebrae 47–48; a patch of small conical teeth on middle of lower jaws; predorsal 49–51% SL; prepectoral 36–39% SL; prepelvic 57–58% SL; distance from pelvic to anal-fin origin 26–28% SL; head length 35–39% SL; eye diameter 22–26% HL; snout length 28–30% HL; location of anus immediately anterior to anal-fin origin; broad longitudinal black stripe above lateral line; dark spot on the base to half of pectoral fin; and no teeth on tongue. The new species is a benthopelagic dweller on muddy bottoms in depths of around 300–600 m.

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SILVA, GABRIEL S. C. "A new species of Phenacorhamdia Dahl 1961 (Siluriformes: Heptapteridae) from the Paranapanema River basin, southeastern Brazil." Zootaxa 4890, no. 2 (December 2, 2020): 275–82. http://dx.doi.org/10.11646/zootaxa.4890.2.8.

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A new species of Phenacorhamdia is described from Paranapanema River, Upper Paraná River basin, southeastern Brazil. The new species is distinguished from congeners by the combination of following characters 45−46 vertebrae; an entirely dark-brown body; nine pleural ribs; eight branched rays in upper lobe of caudal fin; seven branched rays in pectoral fin; 13 anal-fin rays with 9−10 branched; first basal radial inserted at the 13th vertebrae and eight branchiostegal rays.

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HASTINGS, PHILIP A., and KEVIN W. CONWAY. "Gobiesox lanceolatus, a new species of clingfish (Teleostei: Gobiesocidae) from Los Frailes submarine canyon, Gulf of California, Mexico." Zootaxa 4221, no. 3 (January 17, 2017): 393. http://dx.doi.org/10.11646/zootaxa.4221.3.8.

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Gobiesox lanceolatus is described from a single specimen collected from 300 meters depth in the Los Frailes submarine canyon in the southwestern Gulf of California. The "Canyon Clingfish" is unique within Gobiesox in having a lanceolate caudal fin, with the central rays longer than those above and below them. It is also distinguished by 14 dorsal-fin rays (first tiny and unsegmented), 11 anal-fin rays, 28 pectoral-fin rays, anus slightly closer to anal-fin origin than to posterior margin of pelvic disc, and dorsal-fin origin in front of vertical from anus. It is most similar to Gobiesox eugrammus, known from Isla Guadelupe, the coast of outer Baja California and southern California. This is the deepest record for a species of Gobiesox and only four other species of clingfishes are known from greater depths.

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HO, HSUAN-CHING, HIROMITSU ENDO, and TAH-WEI CHU. "A new species of the codlet genus Bregmaceros from the western Pacific Ocean (Gadiformes: Bregmacerotidae)." Zootaxa 4786, no. 4 (June 4, 2020): 565–73. http://dx.doi.org/10.11646/zootaxa.4786.4.8.

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Bregmaceros retrodorsalis sp. nov., a new codlet species is described based on specimens from shallow to deep waters off Japan and Melanesia. It differs from all congeners by having the origin of second dorsal-fin well posterior, above bases of 5th to 7th anal-fin rays and combination of the following characters: a pointed snout distinctly longer than eye diameter; upper lobe of opercle branched distally; body relatively slender, its depth 10.0‒13.0% SL; 13 principal caudal-fin rays (middle 11 branched); 52‒57 second dorsal-fin rays; 58‒63 anal-fin rays; 16‒18 transverse scale rows below dorsal-fin origin; 86‒93 longitudinal scale rows along body axis; vertebrae 55‒58; entire body evenly covered with melanophores, those on lateral sides forming regular longitudinal rows, one melanophores per scale; head and isthmus entirely, but loosely, covered with variably sized melanophores.

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22

Peristiwady, Teguh. "FIRST RECORD ON ODONTANTHIAS FLAGRIS YOSHINO AND ARAGA, 1975 (PERCIFORMES: SERRANIDAE) IN INDONESIAN WATERS." Marine Research in Indonesia 36, no. 1 (October 7, 2018): 7–13. http://dx.doi.org/10.14203/mri.v36i1.523.

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Two specimens of Odontanthias flagris have been caught from Bitung, North Sulawesi in June 2010. Previously, nown locations of this species are Okinawa and Nishino-shima, Japan. O. flagris is very similar with O. rhodopeplus. They shares following characters: dorsal fin rays X, 13; anal fin rays III, 7; pectorals fin rays 17-18; scales above lateral line 7; scales below lateral line 19 and gill rakers on lower limb 28. Characters differing O. flagris from O. rhodopeplus, O. chrysostictus and other six species appear in the percentage of orbit diameter. In addition, O. flagris has shorter pelvic fin rays but longer caudal peduncle and third dorsal fin spine. Its morphological features, distribution, remarks and photo of species are given in this paper.

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Jawad, Laith A., and Liu Jig. "Comparative osteology of the axial skeleton of the genus Pampus (Family: Stromateidae, Perciformes)." Journal of the Marine Biological Association of the United Kingdom 97, no. 2 (March 22, 2016): 277–87. http://dx.doi.org/10.1017/s0025315416000369.

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Seven osteological characters of the axial skeleton are studied in the eight species of the genus Pampus. The characters include: pattern of interdigitation of the dorsal- and anal-fin pterygiophores with the neural and haemal spines of the vertebrae, structure of the vertebral column, distribution of the dorsal- and ventral- procurrent caudal-fin rays, distribution of the principal caudal-fin rays and the morphology of the caudal-fin skeleton. All these features appear to be useful in the characterization of the eight species of the genus Pampus. Formulae for the structure of the vertebral column, the dorsal- and anal-fin pterygiophores’ interdigitation with the neural and haemal spines of the vertebrae, distribution of the dorsal and ventral procurrent caudal-fin rays, and distribution of the principal caudal-fin rays were developed. Pampus nozawae was recently considered a synonym of P. argenteus. However, according to the characters used in the present study, this species is notably distinct from P. argenteus.

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COSTA, WILSON J. E. M. "Moema apurinan sp. n. and Aphyolebias boticarioi sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new annual killifishes from the Rio Purus basin, Brazilian Amazon." Zootaxa 707, no. 1 (October 29, 2004): 1. http://dx.doi.org/10.11646/zootaxa.707.1.1.

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Two new annual fishes are described from the upper Rio Purus drainage, Amazonian basin, northern Brazil. Moema apurinan, new species, is similar to M. staecki, these two species distinguished from other congeners in having contact organs on scales of the flank in males, an acuminate caudal fin, fewer pectoral-fin rays, fewer vertebrae, and a narrower rostral cartilage. Moema apurinan differs from M. staecki in having a longer pectoral fin and a wider basihyal. Moema apurinan is distinguished from all other congeners by possessing fewer caudal-fin rays. Aphyolebias boticarioi, new species, differs from all other congeners by having a deeper body. It is similar to A. rubrocaudatus, A. obliquus, A. claudiae and A. schleseri in having a ventral marginal black stripe on the caudal fin in males. Aphyolebias boticarioi differs from these species by a combination of features including number of anal-fin rays, pectoral-fin rays, vertebrae and gill-rakers, and color patterns.

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Nguyen, Khoi, Ning Yu, Mahesh M. Bandi, Madhusudhan Venkadesan, and Shreyas Mandre. "Curvature-induced stiffening of a fish fin." Journal of The Royal Society Interface 14, no. 130 (May 2017): 20170247. http://dx.doi.org/10.1098/rsif.2017.0247.

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How fish modulate their fin stiffness during locomotive manoeuvres remains unknown. We show that changing the fin's curvature modulates its stiffness. Modelling the fin as bendable bony rays held together by a membrane, we deduce that fin curvature is manifested as a misalignment of the principal bending axes between neighbouring rays. An external force causes neighbouring rays to bend and splay apart, and thus stretches the membrane. This coupling between bending the rays and stretching the membrane underlies the increase in stiffness. Using three-dimensional reconstruction of a mackerel ( Scomber japonicus ) pectoral fin for illustration, we calculate the range of stiffnesses this fin is expected to span by changing curvature. The three-dimensional reconstruction shows that, even in its geometrically flat state, a functional curvature is embedded within the fin microstructure owing to the morphology of individual rays. As the ability of a propulsive surface to transmit force to the surrounding fluid is limited by its stiffness, the fin curvature controls the coupling between the fish and its surrounding fluid. Thereby, our results provide mechanical underpinnings and morphological predictions for the hypothesis that the spanned range of fin stiffnesses correlates with the behaviour and the ecological niche of the fish.

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OKAMOTO, MAKOTO, and HIROYUKI MOTOMURA. "Navigobius asayake, a new species of ptereleotrine goby (Gobioidei: Microdesmidae) from Kagoshima, southern Japan." Zootaxa 4526, no. 3 (November 30, 2018): 373. http://dx.doi.org/10.11646/zootaxa.4526.3.6.

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A new species of ptereleotrine dartfish, Navigobius asayake, is described based on four specimens (45.0–52.1 mm in standard length: SL) collected from off the Satsuma Peninsula and Tanegashima island, Kagoshima, southern Japan. It is distinguished from other congeners by the following combination of characters: second dorsal-fin rays I, 18–19; anal-fin rays I, 19; pectoral-fin rays 21–22; gill rakers 5–6 + 13–15; head length 25.1–26.4% SL; eye diameter 8.6–10.0% SL; pelvic-fin length 15.2–16.1% SL; and a well-developed yellow stripe extending from behind upper part of eye to beneath first dorsal fin.

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27

Rocha, Marcelo Salles, Renildo Ribeiro de Oliveira, and Lúcia H. Rapp Py-Daniel. "A new species of Gladioglanis Ferraris & Mago-Leccia from rio Aripuanã, Amazonas, Brazil (Siluriformes: Heptapteridae)." Neotropical Ichthyology 6, no. 3 (2008): 433–38. http://dx.doi.org/10.1590/s1679-62252008000300017.

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A new species of Gladioglanis is described from a single locality on rio Aripuanã, rio Madeira basin, and can be distinguished from its congeners by the following characters: dorsal-fin spine and spinelet absent, first dorsal-fin ray flexible, unbranched, followed by five branched dorsal-fin rays, pectoral-fin spine short and with few (5 anterior-side, 4 posterior-side) dentations, 22-25 anal-fin rays, round profile of the head in dorsal view, first dorsal-fin pterygiophore in contact with the neural spine of eighth vertebrae, 13 caudal-fin rays in both upper and lower lobes, and 60 total vertebrae. Some of its characters are discussed below and compared among the species of a small clade within Heptapteridae proposed by Bockmann (1998).

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FUKUI, YOSHINO. "A new wrasse, Novaculops compressus n. sp. (Perciformes: Labridae), from the western Pacific Ocean." Zootaxa 4742, no. 3 (February 21, 2020): 555–64. http://dx.doi.org/10.11646/zootaxa.4742.3.9.

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A new sandy, Novaculops compressus n. sp. is described on the basis of two specimens collected from Yoron Island, Japan and Panay Island, the Philippines. The new species is characterized by IX, 12 dorsal-fin rays, III, 12 anal-fin rays, 12 or 13 pectoral-fin rays, interrupted lateral line, 12 + 5 pored lateral-line scales, 4 scale rows above lateral line, 9 scale rows below lateral line, 16 total gill rakers, snout length 11.1% of standard length (SL), orbit diameter 10.0–10.1% SL, body depth 30.9% SL, anal-fin base length 36.2–37.6% SL, first dorsal-fin spine length 6.4–7.0% SL, pectoral-fin axil black, and first two dorsal-fin membranes black. This species is sympatric with N. sciistius in Kagoshima, Japan.

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Özcan, Ebru İfakat. "MURAT NEHRI (PALU-ELAZIĞ)’NDE YAŞAYAN CAPOETA TRUTTA (HECKEL, 1843) TÜRÜNÜN BAZI MERISTIK VE MORFOMETRIK ÖZELLIKLERI." e-Journal of New World Sciences Academy 15, no. 4 (October 31, 2020): 155–62. http://dx.doi.org/10.12739/nwsa.2020.15.4.5a0142.

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In the present study, some meristic and morphometric characteristics of 66 Capoeta trutta (Heckel, 1843) fish samples collected from Murat River (Palu-Elazığ) were examined. The samples were immediately preserved with ice and fixed with 5% formaldehid on arrival in the laboratory. Metric measurements were carried out with 0.01 mm sensitive calipers. Meristic characters were counted as number of the dorsal fin rays, number of the anal fin rays, number of the pelvic fin rays, number of the pectoral fin rays, number of scales on the lateral line and number of the pharyngeal teeth. The morphometric characters were measured as total length, fork length, standard length, predorsal length, postdorsal length, caudal peduncle length, body width, body height, snout length, head length, head width, eye diameter, mouth width, intertorbital length, distance between pelvic fin and anal fin, distance between pelvic fin and pectoral fin. Morphometric measurements as total length percentage and total length regression models and determination coefficients (r2) were calculated. Generally, a significant, high, positive correlation was found between total length and morphometric measurements (r2= 0.70-0.92, p<0.01).

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30

GILL, ANTHONY C., and RANDALL D. MOOI. "Character evidence for the monophyly of the Microdesminae, with comments on relationships to Schindleria (Teleostei: Gobioidei: Gobiidae)." Zootaxa 2442, no. 1 (May 3, 2010): 51. http://dx.doi.org/10.11646/zootaxa.2442.1.4.

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The composition of the Microdesminae has been inconsistently reported in recent molecular studies. A monophyletic Microdesminae consisting of both Indo-Pacific and New World/Atlantic genera is diagnosed here by the following synapomorphies: maxilla with elongate projection extending anteriorly over ascending processes of premaxilla; palatine medial process absent; single dorsal process on cleithrum; supracleithrum oriented vertically and closely applied to cleithrum; posttemporal with elongate posteroventral process; body slender and elongate, with associated increase in number of vertebrae and median fin rays (total vertebrae 42–66 with 19 or more precaudal vertebrae, total dorsal-fin rays 42–78, anal-fin rays 27–43), slender pelvis with anterior extensions of the pelvic intercleithral cartilage, and decrease in number of pelvic-fin rays (with a spine and 2–4 segmented rays); single dorsal fin; dorsal-fin spines usually 12 or more; predominantly 1:1 relationship between interneural spaces and anterior dorsal-fin pterygiophores; and first (supernumerary) ray on first anal pterygiophore a bilaterally paired, segmented ray. Several of these characters (particularly single dorsal process on cleithrum, posttemporal with elongate posteroventral process) support a possible relationship between microdesmines and Schindleria, as does dorsal gill-arch morphology.

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31

ROCHA, YURI GOMES PONCE DE CARVALHO, TELTON PEDRO ANSELMO RAMOS, and ROBSON TAMAR DA COSTA RAMOS. "Phenacorhamdia cabocla, a new heptapterid from the Parnaíba River basin, Northeastern Brazil (Siluriformes: Heptapteridae)." Zootaxa 4402, no. 2 (March 28, 2018): 353. http://dx.doi.org/10.11646/zootaxa.4402.2.7.

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Phenacorhamdia Dahl, 1961 comprises 11 valid species of small demersal and solitary catfishes which occur mainly along riverbeds and are widely distributed throughout rivers of South America. The genus is included within the Nemuroglanis subclade, and species of Phenacorhamdia can be separated from other heptapterid catfishes through external and internal characters. Diagnostic characters include a prognathous mouth, first ray of dorsal and pectoral fins flexible, eight or nine branched rays in the lower lobe of caudal fin, and optic foramen reduced. A new species of Phenacorhamdia is described herein from the upper Parnaíba river basin. Phenacorhamdia cabocla sp. nov is distinct from its congeners by: total vertebrae 44, nine of which with pleural ribs; bifid neural spines until vertebrae 13; last precaudal vertebrae lacking pleural ribs; 7–8 branchiostegal rays; pectoral-fin rays i+6; first pterygiophore of dorsal-fin associated to the neural spine of twelfth vertebrae; dorsal-fin pterygiophores associated to vertebrae 12 to 16; anal-fin with nine branched and 3–4 unbranched rays; upper and lower lobes of caudal fin with 8–9 branched rays each; adipose fin corresponding to 14.9%–18.1% of standard length; and snout length corresponding to 30.0%–35.9% of head length.

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32

Petersen, Jarrod C., and Jason B. Ramsay. "Walking on chains: the morphology and mechanics behind the fin ray derived limbs of sea-robins." Journal of Experimental Biology 223, no. 18 (July 24, 2020): jeb227140. http://dx.doi.org/10.1242/jeb.227140.

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ABSTRACTFish fin rays (lepidotrichia) are typically composed of paired and segmented flexible structures (hemitrichia) that help support and change the shape of the fins to affect water flow. Yet, marine ray-finned fish that are members of the family Priontinae (sea-robins) have specialized pectoral fin rays that are separated from the fin and used as limbs to walk along the seafloor. While previous kinematic studies have demonstrated the use of these specialized fin rays as walking appendages, there is little information on how the morphology of the ‘walking rays’ and associated musculature facilitate underwater walking. Here, we examine the musculoskeletal anatomy of the walking and pectoral fin rays in the striped sea-robin Prionotus evolans and compare the mechanical properties of the rays with those of the smaller northern sea-robin Prionotus carolinus. We aimed to determine what structural modifications in the walking rays allow them to function as a supportive limb. We found enlarged processes for muscle attachment, bone extensions that brace the hemitrich articulations, and reduced flexibility and increased second moment of area along the rostro-caudal bending axis in the rays used for walking. This novel limb design may have promoted the benthic foraging behavior exhibited by these species by uncoupling locomotion and feeding.

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KAWAI, TOSHIO, KUNIO AMAOKA, and BERNARD SÉRET. "Samariscus neocaledonia, a new righteye flounder (Teleostei: Pleuronectiformes: Samaridae) from New Caledonia." Zootaxa 3135, no. 1 (December 19, 2011): 63. http://dx.doi.org/10.11646/zootaxa.3135.1.5.

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A new righteye flounder, Samariscus neocaledonia sp. nov., is described on the basis of two specimens collected in deep waters (244–278 m) around New Caledonia. The new species is easily distinguished from its 18 congeners in having a combination of 78–81 dorsal fin rays, 62–65 anal fin rays, five pectoral fin rays, ca. 55–62 lateral line scales, and 10 abdominal and 31–32 caudal vertebrae.

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CHERNOVA, NATALIA, RALF THIEL, and IRINA EIDUS. "Four new species of Careproctus (Cottoidei: Liparidae) from the deep-water vicinity of the southern Kuril Islands (Western North Pacific)." Zootaxa 4821, no. 1 (July 30, 2020): 71–87. http://dx.doi.org/10.11646/zootaxa.4821.1.3.

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Four new species of Careproctus (Cottoidei: Liparidae) are described from the Bussol Strait (the deepest channel of the Kuril archipelago) and two neighboring abyssal basins of the Western North Pacific. Careproctus laperousei sp. nov. from the northern slope of the Kuril-Kamchatka Trench (depths of 4796–4803 m) has the following characters: vertebrae 57, pectoral-fin rays 26, principal caudal-fin rays 8 and pore pattern 2-6-7-1; it differs from the most similar congeners from the North Pacific in having a black peritoneum, short head (22.5 % of standard length, SL) and large disk (37.0 % of head length, lc). Careproctus brevipectoralis sp. nov. from the Kuril Basin of the Sea of Okhotsk (depths of 3301 m) has the following characters: vertebrae 55, pectoral-fin rays 26, caudal-fin rays 9, pore pattern 2-6-7-1 and peritoneum black; it differs from congeners by the absence of pleural ribs, deep and compressed leaf-like body (greatest depth 119 % lc, depth above anal-fin origin 113 % lc), small head (18 % SL), short pectoral fin (11 % SL) and cartilaginous-like tissue surrounding the dorsal fin. Careproctus pulcher sp. nov. and Careproctus globulus sp. nov., both having 46 vertebrae, are found on the Pacific side of the Bussol Strait at depths of 2350–2358 m. Careproctus pulcher sp. nov. is characterized by pectoral-fin rays 31–32, caudal-fin rays 10, pore pattern 2-6-7-1 and peritoneum pale; it differs from the most similar congeners in having a shorter head (25.5–26.3 % SL in adults) and gill opening reaching ventrally to 4th pectoral ray. Careproctus globulus sp. nov. has the following characters: pectoral-fin rays about 24, caudal-fin rays 8 and peritoneum black; it differs from other species in having a globular body, deep curve of vertebral column and pore pattern 2-5-6-1. Thus, based on these collections, the underwater sill of the Bussol Strait is inhabited by different species of Careproctus than the neighboring abyssal plains, Kuril-Kamchatka Trench and the Kuril Basin of the Sea of Okhotsk. Careproctus laperousei sp. nov. is the most deep-water Careproctus in the North Pacific.

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GILL, ANTHONY C., GERALD R. ALLEN, and MARK V. ERDMANN. "Pseudochromis stellatus, a new species of dottyback from Indonesia (Teleostei: Pseudochromidae)." Zootaxa 4338, no. 2 (October 24, 2017): 333. http://dx.doi.org/10.11646/zootaxa.4338.2.7.

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The Pseudochromis reticulatus complex is diagnosed to include species of Pseudochromis with the combination of a pointed caudal fin (rounded with middle rays produced), a reticulated colour pattern on the upper part of the body, dorsal-fin rays modally III,26, anal-fin rays modally III,15, and pectoral-fin rays modally 18. Members of the complex include P. reticulatus Gill & Woodland, P. pictus Gill & Randall, P. tonozukai Gill & Allen, P. jace Allen, Gill & Erdmann and P. stellatus new species. The last-named is herein described from six specimens from Batanta and Batu Hitam in the Raja Ampat Islands, West Papua, Indonesia. It is distinguished from other members of the complex in live coloration, and in having higher mean numbers of scales in lateral series and of anterior lateral-line scales (36–38 and 29–32, respectively), and a deeper body as measured from the dorsal-fin origin to pelvic-fin origin (31.8–33.5 % SL).

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GILL, ANTHONY C., SERGEY V. BOGORODSKY, and AHMAD O. MAL. "Description of a second species of Gymnoxenisthmus from the Red Sea (Teleostei: Gobioidei: Xenisthmidae)." Zootaxa 4590, no. 1 (April 24, 2019): 177. http://dx.doi.org/10.11646/zootaxa.4590.1.8.

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Gymnoxenisthmus flavicinctus n. sp. is described from the 20.2 mm SL holotype collected from Sharm Obhur, Jeddah, Saudi Arabia, central Red Sea. It differs from the holotype and only known specimen of its congener G. tigrellus in having entirely unbranched pectoral-fin rays (versus only upper two rays and lowermost ray unbranched), 17 (versus 15) pectoral-fin rays and 13 (versus 12) segmented anal-fin rays. It also differs in live and preserved coloration. The new species brings the total number of xenisthmids known from the Red Sea to five.

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PATTERSON, COLIN. "Supernumerary median fin-rays in teleostean fishes." Zoological Journal of the Linnean Society 106, no. 2 (October 1992): 147–61. http://dx.doi.org/10.1111/j.1096-3642.1992.tb01244.x.

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38

Zylberberg, Louise, and François J. Meunier. "Histology of Polypterus senegalus fin rays revisited." Comptes Rendus Palevol 12, no. 4 (April 2013): 203–10. http://dx.doi.org/10.1016/j.crpv.2013.05.006.

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39

GARCÍA-ALZATE, CARLOS A., CÉSAR ROMÁN-VALENCIA, and DONALD C. TAPHORN. "Hyphessobrycon oritoensis (Characiformes: Characidae), a new species from the Putumayo River drainage, Colombian Amazon." Zootaxa 1813, no. 1 (June 30, 2008): 42. http://dx.doi.org/10.11646/zootaxa.1813.1.4.

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Hyphessobrycon oritoensis (Characiformes: Characidae) is described from the Putumayo River drainage of the Colombian Amazon. The new species belongs to the H. heterorhabdus group and is distinguished from all other known species by the following combination of characters: iii,8 dorsal–fin rays, iv, 26–27 anal–fin rays, 19 teeth on dentary, 35 scales in longitudinal series, 10–11 perforated scales in lateral line, 7 scales between lateral line and dorsal–fin origin, 14 predorsal scales and a dark lateral band that extends from the posterior border of the humeral spot to the tips of the middle caudal fin rays.

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GILL, ANTHONY C., YI-KAI TEA, and HIROSHI SENOU. "Navigobius kaguya, new species of ptereleotrine goby (Teleostei: Gobiidae) from the West Pacific." Zootaxa 4347, no. 2 (November 13, 2017): 371. http://dx.doi.org/10.11646/zootaxa.4347.2.11.

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Navigobius kaguya is described on the basis of two specimens from the Ryukyu Islands, Japan, and Luzon, Philippines. It differs from other described species of the genus in live coloration, and in having: second dorsal-fin rays I,16; anal-fin rays I,16; pectoral-fin rays 21–22; gill rakers 5–6 + 17; and first dorsal fin weakly to moderately incised between spines, taller than second dorsal. It closely resembles an undescribed species from Bali and the Maldives, but differs in lacking an orange-red mid-lateral stripe. The possible placement of Navigobius khanhoa in Oxymetapon is discussed.

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41

Taki, Yasuhiko, Hiroshi Kohno, and Shiro Hara. "Early development of fin-supports ani fin-rays in the milkfishChanos chanos." Japanese Journal of Ichthyology 32, no. 4 (December 1986): 413–20. http://dx.doi.org/10.1007/bf02905419.

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42

Henschel, Elisabeth, Pedro H. N. Bragança, Filipe Rangel-Pereira, and Wilson J. E. M. Costa. "A new psammophilic species of the catfish genus Ammoglanis (Siluriformes, Trichomycteridae) from the Amazon River basin, northern Brazil." Zoosystematics and Evolution 96, no. 1 (February 18, 2020): 67–72. http://dx.doi.org/10.3897/zse.96.48952.

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Ammoglanis obliquussp. nov., a minute catfish species reaching a maximum adult size of 15.5 mm, is described from the Rio Preto da Eva drainage in the central Brazilian Amazon. It is distinguished from all of its congeners in possessing an exclusive combination of character states, including the presence and number of premaxillary and dentary teeth, number of interopercular and opercular odontodes, presence of cranial fontanel, number of dorsal-fin rays, number of anal-fin rays, number of caudal-fin rays, number of pelvic-fin rays, number of pectoral-fin rays, absence of pelvic splint, antorbital morphology, and absence of supraorbital and autopalatine morphology. It is considered to be a member of a clade also including A. pulex and A. amapaensis due to the unique oral, antorbital, and autopalatine morphology. Ammoglanis obliquus is regarded as more closely related to A. pulex than to any other congener, as both species exhibit a similar colour pattern, an absence of the metapterygoid, and the presence of two finger-like projections on the chin region.

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43

Fricke, Ronald, Daniel Golani, and Brenda Appelbaum-Golani. "Arnoglossus nigrofilamentosus n. sp., a new species of flounder (Teleostei: Bothidae) from off the Mediterranean coast of Israel, probably a new case of Lessepsian migration." Scientia Marina 81, no. 4 (December 15, 2017): 457. http://dx.doi.org/10.3989/scimar.04684.07a.

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The filamentous flounder Arnoglossus nigrofilamentosus n. sp. is described from four specimens collected in the southeastern Mediterranean near Tel-Aviv, Israel on 5 May 2017. The new species is characterized as follows: second to sixth dorsal-fin rays elongate and filamentous, dorsal-fin rays 78-84, anal-fin rays 61-66, pectoral-fin rays on ocular side 12-13, on blind side 7-9, caudal-fin rays iii,11,iii , lateral-line scales 52-54, gill rakers 0 + 4-5, not serrated, interorbital a narrow bony ridge without scales in the middle, interorbital width 11% to 16% of upper orbit diameter, no enlarged teeth anteriorly in upper jaw, and prevomer small, not enlarged, weakly projecting into mouth cavity; body in fresh specimens pale (may have been dark before the epidermis was abrased), head, peritoneum and vertical fins black. The new species is described and compared with similar species. Though the species has not yet been observed in the northern Red Sea, it probably originates from the Gulf of Suez, so this finding represents a probable new case of Lessepsian migration.

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THIEL, RALF, THOMAS KNEBELSBERGER, and IRINA EIDUS. "Description and DNA barcoding of Lycenchelys lenzeni, a new species of eelpout (Perciformes: Zoarcidae) from the deep sea off the Kuril Archipelago." Zootaxa 4370, no. 1 (January 9, 2018): 45. http://dx.doi.org/10.11646/zootaxa.4370.1.3.

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A new species of eelpout genus Lycenchelys Gill, 1884 is described based on seven specimens caught at a depth of about 2350 m in the Bussol Strait, southwest of the Kuril Island Simushir. The species differs from its congeners in the following combination of characters: vertebrae 26–28 + 100–102 = 126–130; interorbital and occipital pores absent; postorbital pores 3–4; suborbital pores 7 (rarely 6); preoperculomandibular pores 4 + 4; gill rakers 11–16; dorsal fin rays 118–122; anal fin rays 105–108; pelvic fin rays 2; middle and lower ray tips of pectoral fin very slightly exserted; lateral line double with mediolateral and ventral branches; pyloric caeca not developed. The new species is morphologically most similar to Lycenchelys micropora and Lycenchelys jordani, which differ from the new species in having three pelvic-fin rays (vs. two pelvic-fin rays in the new species). L. micropora has the pectoral-fin origin below body midline, whereas the new species has the pectoral-fin origin at body midline. Middle and lower ray tips of pectoral fin are very slightly exserted in L. lenzeni sp. nov., whereas they are well exserted in L. jordani and L. micropora. Mitochondrial COI sequences were analyzed from four paratype specimens and all show the same haplotype sequence. The DNA barcodes allowed discrimination of L. lenzeni sp. nov. from other species of Lycenchelys where sequence data were available. The nearest match with already published sequences was Lycenchelys antarctica, with a sequence similarity of 98.25%, followed by Lycenchelys aratrirostris (sequence similarities 97.95–97.96%) and L. jordani (sequence similarity of 97.81%).

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Matallanas, Jesús. "Description of two new species ofOphthalmolycus(Teleostei: Zoarcidae) from the southern Ocean and key to species of the genus." Journal of the Marine Biological Association of the United Kingdom 91, no. 2 (June 2, 2010): 561–67. http://dx.doi.org/10.1017/s0025315410000615.

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Two new species of zoarcid fish,Ophthalmolycus eastmanisp. nov., andOphthalmolycus polylepissp. nov. are described from specimens collected from the Bellingshausen Sea and Gerlache Strait, Southern Ocean, at depths of 1837 and 1056 m.Ophthalmolycus eastmanican be distinguished from its congeners by the following combination of characters: two posterior nasal pores; epidermal prickles on lips and snout; gill slit extending ventrally to the lower margin of the pectoral fin base; vertebrae asymmetrical 26 − 27 + 91 − 92 = 117 − 118; dorsal fin rays 111–113; dorsal fin origin associated with vertebra 6, with no free pterygiophores; pectoral fin rays 17–18; two postorbital pores; lateral line with ventral and mediolateral branches; scales extending anteriorly to just anterior to the anal fin origin; six branchiostegal rays; oral valve nearly reaching the anterior edge of vomer; palatine teeth in two rows anteriorly; 3–5 pseudobranch filaments; two well developed pyloric caeca; pelvic fin and vomerine teeth present.Ophthalmolycus polylepiscan be distinguished from its congeners by the following combination of characters: two posterior nasal pores; epidermal prickles on lips; gill slit extending ventrally just to below mid-pectoral fin base; interorbital pore present; two postorbital pores; lateral line triple with ventral, mediolateral and dorsolateral branches; scales extending anteriorly to predorsal area, abdomen, pelvic fins base, and pectoral fins base and axil; vertebrae asymmetrical 22 + 76; dorsal fin origin associated with vertebra 5; pectoral fin rays 18; six branchiostegal rays; oral valve overlapping the anterior edge of vomer; two rows of palatine teeth anteriorly; two vestigial pyloric caeca and 2 pseudobranch filaments; pelvic fin and vomerine teeth present. A key to the species ofOphthalmolycusis provided.

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NG, HEOK HEE, LALRAMLIANA LALRAMLIANA, and SAMUEL LALRONUNGA. "Pterocryptis subrisa, a new silurid catfish (Teleostei: Siluridae) from northeastern India." Zootaxa 4500, no. 1 (October 15, 2018): 126. http://dx.doi.org/10.11646/zootaxa.4500.1.8.

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Pterocryptis subrisa, a new species of silurid catfish from the Kaladan River drainage in northeastern India, is described in this study. It can be distinguished from congeners by the unique combination of the following characters: supralabial fold extending posteriorly beyond vertical through posterior orbital margin; nearly circular eye; head length 17.6–19.6% SL; head depth 10.6–11.9% SL; dorsal-fin height 2.6–4.7% SL; 2 dorsal-fin rays; pectoral-fin length 11.8–14.0% SL; body depth at anus 14.4–16.7% SL; caudal peduncle depth 6.8–8.5% SL; 66–75 anal-fin rays; confluent anal and caudal fins separated by deep notch; 17 principal caudal-fin rays; and 57 vertebrae. The generic status of Pterocryptis taytayensis is discussed, with this species being reassigned to Ompok.

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GILL, ANTHONY C., YI-KAI TEA, and HIROSHI SENOU. "Plectranthias takasei, new species of anthiadine fish from southern Japan (Teleostei: Serranidae)." Zootaxa 4205, no. 4 (December 7, 2016): 349. http://dx.doi.org/10.11646/zootaxa.4205.4.3.

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Plectranthias takasei is described from two specimens collected in Izu Oceanic Park, Sagami Bay, Honshu, Japan. It is distinguished from congeners in having the following combination of characters: dorsal rays X,15; no fleshy flaps on dorsal-fin spines; pectoral rays 13, all unbranched; branched caudal-fin rays 8 + 7; lateral line scales 28 (including intermittent and terminal pitted scales); circumpeduncular scales 12; fourth dorsal-fin spine longest; and preopercle without antrorse spines or serrations ventrally, with 2–3 weak serrations or crenulations posteriorly.

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SHANGNINGAM, BUNGDON, SHIBANANDA RATH, ASHA KIRAN TUDU, and LAISHRAM KOSYGIN. "A new species of Osteobrama (Teleostei: Cyprinidae) from the Mahanadi River, India with a note on the validity of O. dayi." Zootaxa 4722, no. 1 (January 10, 2020): 68–76. http://dx.doi.org/10.11646/zootaxa.4722.1.6.

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A new species of the genus Osteobrama is described from the Mahanadi River, Tikarpada, Angul District, Odisha state, India. Osteobrama tikarpadaensis, new species, differs from its congeners in having two pairs of minute barbels; iii–iv unbranched dorsal-fin rays with 25–33 serrae on the last unbranched ray; 15–16 branched pectoral-fin rays, and 25–27 branched anal-fin rays. The status of Osteobrama dayi is discussed and shown to be a valid species. A key to the species of the genus is provided.

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CHEN, ZIMING, JIAN YANG, and JUNXING YANG. "Description of a new species of the genus Yunnanilus Nichols, 1925 (Teleostei: Nemacheilidae) from Yunnan, China." Zootaxa 3269, no. 1 (April 16, 2012): 57. http://dx.doi.org/10.11646/zootaxa.3269.1.5.

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A new species of the family Nemacheilidae, Yunnanilus niulanensis, is described from the upper reach of the NiulanjiangRiver, a branch of the Jinsha River, in Songming County, Yunnan Province, China. It can be distinguished from all otherYunnanilus species by the combination of the following characters: dorsal fin rays iii, 9; anal fin rays iii, 5; pectoral finrays i, 11; pelvic fin rays i, 7–8; branched caudal fin rays 14; mouth subterminal; 9–11 gillrakers on the inner side of thefirst gill arch, no gillrakers on the outer side; upper two-thirds of body and head covered by large brown spots; fins hyaline;body covered with scales; no lateral line; no cephalic sensory pores; caudal-peduncle length less than caudal-peduncledepth; caudal-peduncle length 9.2–11.1 % SL; body depth 21.0–25.8 % SL; eye diameter 5.4–6.0 % SL; interorbital width 9.9–12.1 % SL.

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MARINHO, MANOELA M. F., FERNANDO R. CARVALHO, FRANCISCO LANGEANI, and FLÁVIO L. TATSUMI. "A new Hemigrammus Gill from upper rio Parana system, Southeastern Brazil (Characiformes: Characidae)." Zootaxa 1724, no. 1 (March 10, 2008): 52. http://dx.doi.org/10.11646/zootaxa.1724.1.2.

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Hemigrammus parana is described from the upper rio Paraná system, in the area of influence of the Ilha Solteira reservoir in states of Mato Grosso do Sul, Minas Gerais and São Paulo, southeastern Brazil. The new species differs from all congeners by the combination of the following characters: absence of humeral spot; presence of a roughly triangular or rectangular conspicuous black caudal spot, extending from base to tip of middle caudal-fin rays, its greatest depth at base of caudal-fin rays; and anal-fin rays iii–iv, 18–23.

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Journal articles on the topic 'Fin rays'

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