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Journal articles on the topic 'Acanthostemma'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Cabactulan, Derek D., Michele Rodda, and Reynold Pimentel. "Hoya of the Philippines part I. Hoya migueldavidii (Apocynaceae, Asclepiadoideae), a new species from Northern Mindanao, Philippines." PhytoKeys 80 (June 5, 2017): 105–12. https://doi.org/10.3897/phytokeys.80.12872.

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A new species of Hoya R.Br. from Mindanao (Philippines), Hoya migueldavidii Cabactulan, Rodda & Pimentel, is described and illustrated. It is a member of Hoya section Acanthostemma (Blume) Kloppenb. that is particularly speciose in the Philippines. It is compared with the similar Hoya loheri Kloppenb, also endemic of the Philippines, from which it differs in indumentum of the vegetative parts (pubescent vs. glabrous), the shape of the corolla (almost spherical vs. partly flattened) and the type of gynostegium (not stipitate vs. stipitate)

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2

Rodda, Michele, and Juhonewe Nadhanielle Simonsson. "Hoya isabelchanae Rodda & Simonsson, a new, showy species of Hoya R.Br. (Apocynaceae, Asclepiadoideae) with pomegranate red flowers from Sulawesi, Indonesia." PhytoKeys 68 (August 2, 2016): 45–50. https://doi.org/10.3897/phytokeys.68.8803.

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A new species of Hoya R.Br. from Sulawesi (Indonesia), H. isabelchanae Rodda & Simonsson, is described and illustrated. It is one of the largest flowered species in Hoya section Acanthostemma (Blume) Kloppenb. Its flowers are of comparable size to those of Hoya benchaii Gavrus et al., Hoya kloppenburgii T.Green, Hoya rundumensis (T.Green) Rodda & Simonsson and Hoya sigillatis T.Green ssp. sigillatis, all from Borneo. Among Sulawesi species it is compared with the vegetatively similar Hoya brevialata Kleijn & van Donkelaar and Hoya pallilimba Kleijn & van Donkelaar.

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Rodda, Michele. "Two new species of Hoya R.Br. (Apocynaceae, Asclepiadoideae) from Borneo." PhytoKeys 53 (July 21, 2015): 83–93. https://doi.org/10.3897/phytokeys.53.5079.

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Two new Hoya R.Br. species from Borneo are described and illustrated. The first, Hoya ruthiae Rodda was collected in Sabah on Bukit Baturong, a limestone outcrop. It is one of the few species in the genus to have clear exudate. It is compared with the morphologically related Hoya uncinata Teijsm. and Binn. The other, Hoya bakoensis Rodda, was collected in the kerangas forests of Bako National Park. It belongs to Hoya section Acanthostemma (Bl.) Kloppenb., a section with numerous members in the Philippines but under-represented in Borneo.

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4

Neenan, James M., Marcello Ruta, Jennifer A. Clack, and Emily J. Rayfield. "Feeding biomechanics in Acanthostega and across the fish–tetrapod transition." Proceedings of the Royal Society B: Biological Sciences 281, no. 1781 (2014): 20132689. http://dx.doi.org/10.1098/rspb.2013.2689.

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Acanthostega is one of the earliest and most primitive limbed vertebrates. Its numerous fish-like features indicate a primarily aquatic lifestyle, yet cranial suture morphology suggests that its skull is more similar to those of terrestrial taxa. Here, we apply geometric morphometrics and two-dimensional finite-element analysis to the lower jaws of Acanthostega and 22 other tetrapodomorph taxa in order to quantify morphological and functional changes across the fish–tetrapod transition. The jaw of Acanthostega is similar to that of certain tetrapodomorph fish and transitional Devonian taxa bot

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5

Clack, J. A. "The dermal skull roof of Acanthostega gunnari, an early tetrapod from the Late Devonian." Transactions of the Royal Society of Edinburgh: Earth Sciences 93, no. 1 (2002): 17–33. http://dx.doi.org/10.1017/s0263593300000304.

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ABSTRACTThe dermal skull roof of Acanthostega gunnari Jarvik is described in detail, giving new information on the anatomy, and new reconstructions of the skull in dorsal, lateral and occipital views, as well as sections through the skull at two points. The types of suture are compared with those of temnospondyls and discosauriscids, comparable animals in terms of habit and skull shape. The skull-bones of Acanthostega are much more closely integrated with each other than those of the two later groups. However, regions of relatively less firmly and more firmly sutured regions are comparable in

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6

Bidgood, Sally, and R. K. Brummitt. "Acanthostelma, a New Genus of Acanthaceae from Somalia." Kew Bulletin 40, no. 4 (1985): 855. http://dx.doi.org/10.2307/4109870.

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7

Ahlberg, Per Erik, and Jennifer A. Clack. "Lower jaws, lower tetrapods–a review based on the Devonian genus Acanthostega." Transactions of the Royal Society of Edinburgh: Earth Sciences 89, no. 1 (1998): 11–46. http://dx.doi.org/10.1017/s0263593300002340.

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AbstractThe lower jaw of the Devonian tetrapod Acanthostega is described for the first time. Redescriptions are provided for the lower jaws of the elpistostegid Panderichthys, the Devonian tetrapods Elginerpeton, Obruchevichthys, Metaxygnathus, Ventastega and Ichthyostega, and the Carboniferous tetrapods Crassigyrinus, Megalocephalus and Gephyrostegus. The character distri- butions thus revealed differ considerably from previous accounts, particularly in the wide distribution of certain primitive characters. Meckelian ossification in the middle part of the jaw is widespread among Devonian tetr

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8

Ahlberg, Per Erik, Ervins Luksevics, and Oleg Lebedev. "The First Tetrapod Finds from the Devonian (Upper Famennian) of Latvia." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 343, no. 1305 (1994): 303–28. http://dx.doi.org/10.1098/rstb.1994.0027.

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Ventastega curonica, from the Upper Famennian Ketleri Formation, is the first tetrapod find from the Upper Devonian of Latvia, and only the fourth adequately represented Devonian tetrapod genus to be described. The taxon is represented by disarticulated cranial and postcranial elements from two localities, Ketleri on the Venta River and Pavari on the Ciecere River. A second tetrapod, represented by a single mandibular fragment, appears to be present at Ketleri. The lower jaw of Ventastega is strikingly primitive in retaining fangs on the coronoid series, but shares many characters with those o

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9

Clack, J. A. "A revised reconstruction of the dermal skull roof of Acanthostega gunnari, an early tetrapod from the Late Devonian." Transactions of the Royal Society of Edinburgh: Earth Sciences 93, no. 2 (2002): 163–65. http://dx.doi.org/10.1017/s0263593300000390.

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ABSTRACTA revised reconstruction of the dermal skull roof of Acanthostega gunnari from the Upper Devonian of East Greenland is provided, incorporating modifications consequent upon further study of the specimens and in the light of new information from the Upper Devonian genus Ventastega from Latvia. The new reconstruction features a midline gap between the frontal and nasal bones and median rostrals. A revised profile for the skull and a rendition of the dermal ornament is also provided.

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10

Sanchez, Sophie, Paul Tafforeau, Jennifer A. Clack, and Per E. Ahlberg. "Life history of the stem tetrapod Acanthostega revealed by synchrotron microtomography." Nature 537, no. 7620 (2016): 408–11. http://dx.doi.org/10.1038/nature19354.

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11

Coates, M. I. "The Devonian tetrapod Acanthostega gunnari Jarvik: postcranial anatomy, basal tetrapod interrelationships and patterns of skeletal evolution." Transactions of the Royal Society of Edinburgh: Earth Sciences 87, no. 3 (1996): 363–421. http://dx.doi.org/10.1017/s0263593300006787.

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ABSTRACTThe postcranial skeleton of Acanthostega gunnari from the Famennian of East Greenland displays a unique, transitional, mixture of features conventionally associated with fishand tetrapod-like morphologies. The rhachitomous vertebral column has a primitive, barely differentiated atlas-axis complex, encloses an unconstricted notochordal canal, and the weakly ossified neural arches have poorly developed zygapophyses. More derived axial skeletal features include caudal vertebral proliferation and, transiently, neural radials supporting unbranched and unsegmented lepidotrichia. Sacral and p

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12

CLACK, J. A. "The neurocranium of Acanthostega gunnari Jarvik and the evolution of the otic region in tetrapods." Zoological Journal of the Linnean Society 122, no. 1-2 (1998): 61–97. http://dx.doi.org/10.1111/j.1096-3642.1998.tb02525.x.

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13

Clack, J. A. "Acanthostega gunnari, a Devonian tetrapod from Greenland; the snout, palate and ventral parts of the braincase, with a discussion of their significance." Meddelelser om Grønland. Geoscience 31 (April 19, 1994): 24. http://dx.doi.org/10.7146/moggeosci.v31i.140691.

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The snout, including the naris and choana, and the palate, ventral parts of the brain case and suspensorium of Acanthostega gunnari are described from three-dimensional specimens and sections. The naris is low on the snout, and the choana and vomerine dentition resemble those of osteolepiform fishes. The braincase is ossified in two portions in ventral view, with the ventral cranial fissure still evident. Dorsally, however, the otic region and sphenethmoid are co-ossified, so there was no movement possible between them. The palate is "closed" as in osteolepi forms and primitive tetrapods, and

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14

Porro, Laura B., Emily J. Rayfield, and Jennifer A. Clack. "Descriptive Anatomy and Three-Dimensional Reconstruction of the Skull of the Early Tetrapod Acanthostega gunnari Jarvik, 1952." PLOS ONE 10, no. 3 (2015): e0118882. http://dx.doi.org/10.1371/journal.pone.0118882.

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15

Ahlberg, Per E., and Jennifer A. Clack. "The smallest known Devonian tetrapod shows unexpectedly derived features." Royal Society Open Science 7, no. 4 (2020): 192117. http://dx.doi.org/10.1098/rsos.192117.

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A new genus and species of Devonian tetrapod, Brittagnathus minutus gen. et sp. nov., is described from a single complete right lower jaw ramus recovered from the Acanthostega mass-death deposit in the upper part of the Britta Dal Formation (upper Famennian) of Stensiö Bjerg, Gauss Peninsula, East Greenland. Visualization by propagation phase contrast synchrotron microtomography allows a complete digital dissection of the specimen. With a total jaw ramus length of 44.8 mm, Brittagnathus is by far the smallest Devonian tetrapod described to date. It differs from all previously known Devonian te

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16

Bonfá-Neto, Pedro, Frederico Falcão Salles, and Albane Vilarino. "New species of the long-horned caddisfly Oecetis McLachlan, 1877 (Trichoptera: Leptoceridae) from the Atlantic Forest, Brazil and their evolutionary relationship." Arthropod Systematics & Phylogeny 82 (July 2, 2024): 551–66. http://dx.doi.org/10.3897/asp.82.e114286.

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Asymmetrical genitalia are reported from majorTrichoptera subgroups and evolved multiple times independently. In Oecetis, it is a characteristic of the insconpicua group. However, certain species in other species groups also evolved an asymmetrical spiny projection on the phallotheca. Here, two new species with an asymmetric projection are described in the falicia group from the Brazilian Atlantic Forest, Espírito Santo state. Their phylogenetic relationships were investigated through a Bayesian analysis combining COI and morphological data. Additionally, we provide new records of Oecetis conn

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17

Bonfá-Neto, Pedro, Frederico Falcão Salles, and Albane Vilarino. "New species of the long-horned caddisfly Oecetis McLachlan, 1877 (Trichoptera: Leptoceridae) from the Atlantic Forest, Brazil and their evolutionary relationship." Arthropod Systematics & Phylogeny 82 (July 2, 2024): 551–66. https://doi.org/10.3897/asp.82.e114286.

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Asymmetrical genitalia are reported from major Trichoptera subgroups and evolved multiple times independently. In <i>Oecetis</i>, it is a characteristic of the <i>insconpicua</i> group. However, certain species in other species groups also evolved an asymmetrical spiny projection on the phallotheca. Here, two new species with an asymmetric projection are described in the <i>falicia</i> group from the Brazilian Atlantic Forest, Espírito Santo state. Their phylogenetic relationships were investigated through a Bayesian analysis combining COI and morphological data. Additionally, we provide new r

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18

Coates, Michael I. "The origin of vertebrate limbs." Development 1994, Supplement (1994): 169–80. http://dx.doi.org/10.1242/dev.1994.supplement.169.

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The earliest tetrapod limbs are polydactylous, morphologically varied and do not conform to an archetypal pattern. These discoveries, combined with the unravelling of limb developmental morphogenetic and regulatory mechanisms, have prompted a re-examination of vertebrate limb evolution. The rich fossil record of vertebrate fins/limbs, although restricted to skeletal tissues, exceeds the morphological diversity of the extant biota, and a systematic approach to limb evolution produces an informative picture of evolutionary change. A composite framework of several phylogenetic hypotheses is prese

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19

Berman, David S. "Origin and early evolution of the amniote occiput." Journal of Paleontology 74, no. 5 (2000): 938–56. http://dx.doi.org/10.1017/s0022336000033114.

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Reinterpretation of cranial materials of the diadectomorphs Limnoscelis and Diadectes has prompted a reconsideration of the origin and early evolution of the amniote occiput. The basic approach is a phylogenetic study of major groups of Paleozoic tetrapods based on the occiput and closely associated elements of the skull roof. A lack of adequate anatomical data has forced the elimination of only a few relevant higher-level taxa from consideration, and, using Acanthostega as the reference outgroup, a cladistic analysis of the interrelationships of the Lepospondyli, Temnospondyli, Seymouriamorph

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20

Marzola, Marco, Octávio Mateus, Jesper Milàn, and Lars B. Clemmensen. "A review of Palaeozoic and Mesozoic tetrapods from Greenland." Bulletin of the Geological Society of Denmark 66 (March 3, 2018): 21–46. http://dx.doi.org/10.37570/bgsd-2018-66-02.

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This article presents a synthesis of Palaeozoic and Mesozoic fossil tetrapods from Greenland, including an updated review of the holotypes and a new photographic record of the main specimens. All fossil tetrapods found are from East Greenland, with at least 30 different known taxa: five stem tetrapods (Acanthostega gunnari, Ichthyostega eigili, I. stensioi, I. watsoni, and Ymeria denticulata) from the Late Devonian of the Aina Dal and Britta Dal Formations; four temnospondyl amphibians (Aquiloniferus kochi, Selenocara groenlandica, Stoschiosaurus nielseni, and Tupilakosaurus heilmani) from the

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21

Clack, J. A. "A new baphetid (stem tetrapod) from the Upper Carboniferous of Tyne and Wear, U.K., and the evolution of the tetrapod occiput." Canadian Journal of Earth Sciences 40, no. 4 (2003): 483–98. http://dx.doi.org/10.1139/e02-065.

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A new genus and species of baphetid, Kyrinion martilli, is described from the Westphalian A (Upper Carboniferous) of Tyne and Wear, England. The skull, braincase, and partial lower jaws are preserved in a nodule of iron-rich seat-earth, in an almost uncrushed state. The occiput and both stapes are in place. The palate and braincase are united by a continuous sheet of denticulated pterygoid and parasphenoid eliminating the interpterygoid vacuities completely, and the parasphenoid bounds deep parasphenoidal tubera; the marginal palatal bones, pterygoid, and dentary are united by interdigitated s

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22

Blom, Henning, Jennifer A. Clack, and Per E. Ahlberg. "Localities, distribution and stratigraphical context of the Late Devonian tetrapods of East Greenland." Meddelelser om Grønland. Geoscience 43 (January 1, 2005). http://dx.doi.org/10.7146/moggeosci.v43i.140286.

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The Devonian tetrapod-yielding localities of East Greenland are described in detail, giving new information on distribution and stratigraphical context. Three genera of tetrapods, Ichthyostega, Acanthostega and a third not yet described, are known from different localities on Gauss Halvø and Ymer Ø. On Ymer Ø, tetrapods have been found loose in talus on the north and south sides of Celsius Bjerg. Tetrapod localities on Gauss Halvø are distributed between Parallel dal and along the south coastline, and are represented both by talus-derived and in situ collected material. One in situ locality, y

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23

"The dermal skull roof of Acanthostega gunnari, an early tetrapod from the Late Devonian." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 93, no. 01 (2002): 17. http://dx.doi.org/10.1017/s0263593302000020.

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24

"Correction: Descriptive Anatomy and Three-Dimensional Reconstruction of the Skull of the Early Tetrapod Acanthostega gunnari Jarvik, 1952." PLOS ONE 10, no. 4 (2015): e0124731. http://dx.doi.org/10.1371/journal.pone.0124731.

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25

"A revised reconstruction of the dermal skull roof of Acanthostega gunnari, an early tetrapod from the Late Devonian." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 93, no. 02 (2002): 163. http://dx.doi.org/10.1017/s0263593302000111.

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26

Ahlberg, P. E., and T. R. Smithson. "Jennifer A. Clack. 3 November 1947—26 March 2020." Biographical Memoirs of Fellows of the Royal Society, May 19, 2021. http://dx.doi.org/10.1098/rsbm.2021.0008.

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Jennifer Clack (née Agnew) dedicated her entire research career of more than 40 years to the fish-tetrapod transition, the evolutionary process during the Devonian and Carboniferous periods that transformed a lineage of lobe-finned fishes into the earliest land vertebrates. She was widely regarded as the world leader in this field. During an expedition in the summer of 1987 to the Late Devonian vertebrate localities of East Greenland, Clack collected numerous fossils of two of the earliest tetrapods, Acanthostega and Ichthyostega , which revolutionized the understanding of these animals and cr

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27

Molnar, Julia, John Hutchinson, Rui Diogo, and Stephanie Pierce. "Changes in pectoral appendicular muscle anatomy and function over the water‐land transition in tetrapods." FASEB Journal 31, S1 (2017). http://dx.doi.org/10.1096/fasebj.31.1_supplement.579.4.

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The question of how tetrapod limbs evolved from fins is one of the great puzzles of vertebrate biology. While paleontologists, developmental biologists, and geneticists have made great strides in explaining the origin and early evolution of limb skeletal structures, that of the muscles remains largely unknown. We sought to fill this gap by reconstructing pectoral appendicular muscles in three fossil taxa and measuring changes in muscle leverage about the shoulder and elbow joints over the fin‐limb and water‐land transitions. Building upon hypotheses of muscle homology recently published by our

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