Academic literature on the topic 'Heterobranchs'
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Journal articles on the topic "Heterobranchs"
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Evertsen, Jussi, and Torkild Bakken. "Heterobranchia (Mollusca, Gastropoda) from northern Norway, with notes on ecology and distribution." Fauna norvegica 22 (October 3, 2024): 15–22. http://dx.doi.org/10.5324/fn.v22i0.5985.
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During a diving expedition through northern Norway, a total of 25 heterobranchiate taxa were collected, and additional data on distribution and ecology were given. Cumanotus beaumonti and Flabellina borealis are recorded for the first time since Odhner (1907), (1922) on the Norwegian coast, and the distribution of eight heterobranch taxa were re-evaluated. By using SCUBA diving as a sampling method, it is proved that the diversity and distribution of heterobranchs is poorly known in northern Norwegian waters, as the results show that large quantities of specimens, as well as a significant number of taxa, are found at each locality. The significance of diving for studying heterobranchs is emphasized. Apart from new records of heterobranchs and enhanced knowledge of biodiversity and biogeography of this group in northern Norway, this paper presents previous published literature where heterobranch taxa are mentioned for northern Norway.
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Avila, Conxita. "Terpenoids in Marine Heterobranch Molluscs." Marine Drugs 18, no. 3 (2020): 162. http://dx.doi.org/10.3390/md18030162.
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Heterobranch molluscs are rich in natural products. As other marine organisms, these gastropods are still quite unexplored, but they provide a stunning arsenal of compounds with interesting activities. Among their natural products, terpenoids are particularly abundant and diverse, including monoterpenoids, sesquiterpenoids, diterpenoids, sesterterpenoids, triterpenoids, tetraterpenoids, and steroids. This review evaluates the different kinds of terpenoids found in heterobranchs and reports on their bioactivity. It includes more than 330 metabolites isolated from ca. 70 species of heterobranchs. The monoterpenoids reported may be linear or monocyclic, while sesquiterpenoids may include linear, monocyclic, bicyclic, or tricyclic molecules. Diterpenoids in heterobranchs may include linear, monocyclic, bicyclic, tricyclic, or tetracyclic compounds. Sesterterpenoids, instead, are linear, bicyclic, or tetracyclic. Triterpenoids, tetraterpenoids, and steroids are not as abundant as the previously mentioned types. Within heterobranch molluscs, no terpenoids have been described in this period in tylodinoideans, cephalaspideans, or pteropods, and most terpenoids have been found in nudibranchs, anaspideans, and sacoglossans, with very few compounds in pleurobranchoideans and pulmonates. Monoterpenoids are present mostly in anaspidea, and less abundant in sacoglossa. Nudibranchs are especially rich in sesquiterpenes, which are also present in anaspidea, and in less numbers in sacoglossa and pulmonata. Diterpenoids are also very abundant in nudibranchs, present also in anaspidea, and scarce in pleurobranchoidea, sacoglossa, and pulmonata. Sesterterpenoids are only found in nudibranchia, while triterpenoids, carotenoids, and steroids are only reported for nudibranchia, pleurobranchoidea, and anaspidea. Many of these compounds are obtained from their diet, while others are biotransformed, or de novo biosynthesized by the molluscs. Overall, a huge variety of structures is found, indicating that chemodiversity correlates to the amazing biodiversity of this fascinating group of molluscs.
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Jovanović, Milica, Vesna Mačić, Domen Trkov, Martina Orlando-Bonaca, and Lovrenc Lipej. "Review of heterobranch molluscs fauna in the Boka Kotorska Bay, Montenegro." Acta Adriatica 60, no. 2 (2019): 115–26. http://dx.doi.org/10.32582/aa.60.2.1.
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Heterobranch molluscs fauna in Montenegro has been poorly investigated so far. The aim of the present paper is to improve the knowledge about species diversity of these marine organisms in the Boka Kotorska Bay, specific fjord-like entity in the southern Adriatic Sea. New records of seven heterobranch species were obtained by field surveys in 2017, while three new records were provided by analysing underwater photographs from previous periods. The resulted checklist summarizes the knowledge of the diversity of heterobranchs in the Boka Kotorska Bay from the oldest record in 1967 to the present day and consists of a total of 62 heterobranch species.
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Avila, Conxita, and Carlos Angulo-Preckler. "Bioactive Compounds from Marine Heterobranchs." Marine Drugs 18, no. 12 (2020): 657. http://dx.doi.org/10.3390/md18120657.
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The natural products of heterobranch molluscs display a huge variability both in structure and in their bioactivity. Despite the considerable lack of information, it can be observed from the recent literature that this group of animals possesses an astonishing arsenal of molecules from different origins that provide the molluscs with potent chemicals that are ecologically and pharmacologically relevant. In this review, we analyze the bioactivity of more than 450 compounds from ca. 400 species of heterobranch molluscs that are useful for the snails to protect themselves in different ways and/or that may be useful to us because of their pharmacological activities. Their ecological activities include predator avoidance, toxicity, antimicrobials, antifouling, trail-following and alarm pheromones, sunscreens and UV protection, tissue regeneration, and others. The most studied ecological activity is predation avoidance, followed by toxicity. Their pharmacological activities consist of cytotoxicity and antitumoral activity; antibiotic, antiparasitic, antiviral, and anti-inflammatory activity; and activity against neurodegenerative diseases and others. The most studied pharmacological activities are cytotoxicity and anticancer activities, followed by antibiotic activity. Overall, it can be observed that heterobranch molluscs are extremely interesting in regard to the study of marine natural products in terms of both chemical ecology and biotechnology studies, providing many leads for further detailed research in these fields in the near future.
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Salvador, Xavier, Robert Fernández-Vilert, and Juan Moles. "Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda)." Journal of Natural History 56, no. 5-8 (2022): 265–310. https://doi.org/10.1080/00222933.2022.2040630.
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Salvador, Xavier, Fernández-Vilert, Robert, Moles, Juan (2022): Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda). Journal of Natural History 56 (5-8): 265-310, DOI: 10.1080/00222933.2022.2040630, URL: http://dx.doi.org/10.1080/00222933.2022.2040630
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Papu, Adelfia, Nani Undap, Nancy Armas Martinez, et al. "First Study on Marine Heterobranchia (Gastropoda, Mollusca) in Bangka Archipelago, North Sulawesi, Indonesia." Diversity 12, no. 2 (2020): 52. http://dx.doi.org/10.3390/d12020052.
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As ephemeral, benthic, secondary consumers usually associated with sessile coral reef organisms, marine heterobranchs are good indicators of the health of marine tropical habitats. Thus, marine Heterobranchia have recently become a major target for monitoring programs. For this work, an extensive survey was made in Bangka Archipelago, the first of its kind in this area. Bangka Archipelago is composed of small islands and the adjacent coastline of North Sulawesi. The substrate is dominated by biogenic reefs and volcanic rocks, thus forming highly diverse habitats. In total, 149 species were collected and/or photo-documented in September 2017 and September 2018, which represents the dry season. They can be assigned to the Cephalaspidea, Aplysiida, Pleurobranchida, Nudibranchia, and Eupulmonata. Thirty-three species are new to science, highlighting the lack of knowledge about the group and especially about this region. Our data provide a baseline for future monitoring surveys, as the anthropogenic pressures on Bangka Archipelago are increasing due to enhanced touristic activities, but also due to large scale environmental changes caused by previous mining operation activities.
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Cunha, Tauana Junqueira, and Gonzalo Giribet. "A congruent topology for deep gastropod relationships." Proceedings of the Royal Society B: Biological Sciences 286, no. 1898 (2019): 20182776. http://dx.doi.org/10.1098/rspb.2018.2776.
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Gastropod molluscs are among the most diverse and abundant animals in the oceans, and are successful colonizers of terrestrial and freshwater environments. Past phylogenetic efforts to resolve gastropod relationships resulted in a range of conflicting hypotheses. Here, we use phylogenomics to address deep relationships between the five major gastropod lineages—Caenogastropoda, Heterobranchia, Neritimorpha, Patellogastropoda and Vetigastropoda—and provide one congruent and well-supported topology. We substantially expand taxon sampling for outgroups and for previously underrepresented gastropod lineages, presenting new transcriptomes for neritimorphs and patellogastropods. We conduct analyses under maximum-likelihood, Bayesian inference and a coalescent-based approach, accounting for the most pervasive sources of systematic errors in large datasets: compositional heterogeneity, site heterogeneity, heterotachy, variation in evolutionary rates among genes, matrix completeness, outgroup choice and gene tree conflict. We find that vetigastropods and patellogastropods are sister taxa, and that neritimorphs are the sister group to caenogastropods and heterobranchs. We name these two major unranked clades Psilogastropoda and Angiogastropoda, respectively. We additionally provide the first genomic-scale data for internal relationships of neritimorphs and patellogastropods. Our results highlight the need for reinterpreting the evolution of morphological and developmental characters in gastropods, especially for inferring their ancestral states.
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Cunha, Tauana J., Jose Fernández-Simón, Macy Petrula, Gonzalo Giribet, and Juan Moles. "Photographic Checklist, DNA Barcoding, and New Species of Sea Slugs and Snails from the Faafu Atoll, Maldives (Gastropoda: Heterobranchia and Vetigastropoda)." Diversity 15, no. 2 (2023): 219. http://dx.doi.org/10.3390/d15020219.
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Baseline biodiversity data are key for ecological and evolutionary studies and are especially relevant for areas such as the Maldivian Archipelago in the Indian Ocean, which can act as a stepping-stone for the transport of widely distributed marine species. We surveyed the islands and reefs of the Faafu and Malé Atolls with snorkeling and scuba diving, collecting the two gastropod subclasses, Heterobranchia and Vetigastropoda. Our inventory comprises 104 species photographed alive to create an identification guide. We also provide COI barcodes for most species, adding novel sequence data for the Maldivian malacofauna. Half of our species represent new records for the Maldives, emphasizing how much diversity remains to be discovered. Species distributions reflect ecological rarity, with almost 60% of taxa only found in one site. We also compiled a comprehensive checklist of heterobranchs and vetigastropods of the Maldives based on literature records, resulting in 320 species, which, together with barcoding data, indicate several potential cryptic species in the Indo-Pacific. Six new species are described, the nudibranchs Limenandra evanescenti n. sp., Eubranchus putnami n. sp., Sakuraeolis marhe n. sp., Moridilla maldivensis n. sp., Tergiposacca perspicua n. sp., and the sacoglossan Costasiella fridae n. sp.
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Chaban, E. M. "Shell-bearing mollusks of the order Cephalaspidea (Gastropoda: Heterobranchia) of the Kara Sea: fauna and ecology." Proceedings of the Zoological Institute RAS 325, no. 2 (2021): 197–216. http://dx.doi.org/10.31610/trudyzin/2021.325.2.197.
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The survey of shell-bearing heterobranchs of the order Cephalaspidea of the Kara Sea has been done based on unpublished and literature data. The studied material includes that collected during expeditions aboard R/V Professor Multanovskiy in August–September 2019 and R/V Dalnie Zelentsy in August 2012. Additionally, the material of collections of the Zoological Institute of the Russian Academy of Sciences (Saint Petersburg) has been studied. The fauna of heterobranch molluscs of the order Cephalaspidea in the Kara Sea includes 18 described and 1 undescribed species that belong to 10 genera and 6 families. It has been specified that the type locality of Retusa semen Reeve, 1855 (Port Refuge) is located at Port Refuge National Historic Site of Canada, Devon Island, Nunavut, not in the Kara Sea. Retusa semen is considered here as species inquirenda because of the brief original description, significant differences in drawings of the shell of this species made by different authors, and the absence of type specimens. The presence of Diaphana minuta Brown, 1827, Laona quadrata (Wood, 1839), Philine sinuata Stimpson, 1851 and Retusa semen in the Kara Sea needs confirmation. Species numbers of heterobranch molluscs of the order Cephalaspidea decrease from the Barents Sea (21) through the Kara Sea (19) to the Laptev Sea (15) because of the decreasing proportion of boreal-arctic species. Among cephalaspids of the Kara Sea, the highest average abundance (individuals/m2) was observed for Cylichnoides densistriatus (Leche, 1878), and the highest average biomass for Cylichna corticata (Møller, 1842). The proportion of live individuals in the populations does not exceed 18% in late August – early September. The taxonomic structure of the cephalaspid fauna of the Kara Sea has been studied based exclusively on morphological characters. Further study of the fauna is needed based on molecular analyses of the material fixed in 96˚ alcohol.
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Parries, Shawn C., and Louise R. Page. "Larval development and metamorphic transformation of the feeding system in the kleptoparasitic snail Trichotropis cancellata (Mollusca, Caenogastropoda)." Canadian Journal of Zoology 81, no. 10 (2003): 1650–61. http://dx.doi.org/10.1139/z03-154.
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Trichotropis cancellata Hinds, 1849 has a planktonic larval stage that feeds on microalgae and a benthic stage that feeds both by ctenidial suspension feeding and by stealing food ("kleptoparasitism") from several species of suspension-feeding, tube-dwelling polychaete worms. We used scanning electron microscopy, histological sections, and observations on live animals to document the sequence and timing of morphogenetic events during larval and metamorphic development of T. cancellata. These data were compared with other accounts of gastropod development to test for differences in the timing of developmental events among feeding larvae of two major gastropod clades: the caeno gastropods and heterobranchs. In T. cancellata, as in feeding larvae of previously studied caenogastropods, components of the post-metamorphic body plan differentiate at an earlier stage of larval development (relative to times of hatching and ability to undergo metamorphosis) than in feeding heterobranch larvae. Metamorphosis of T. cancellata was induced by polychaete hosts of this snail's kleptoparasitic benthic stage, and young juveniles of T. cancellata could steal food from these polychaetes within a day after snail metamorphosis began. Rapid onset of kleptoparasitic feeding following metamorphosis of T. cancellata was permitted by development of a specialized feeding structure, the pseudo proboscis, during the larval stage. This novel embellishment of larval development was likely preceded during evolution by selective larval induction by polychaete hosts.
Dissertations / Theses on the topic "Heterobranchs"
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BARROS, José Carlos Nascimento de. "Sistemática e morfometria multivariada de Pyramidellidae (Gastropoda, Heterobranchia)." Universidade Federal de Pernambuco, 2003. https://repositorio.ufpe.br/handle/123456789/8700.
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Previous issue date: 2003<br>A família Pyramidellidae Gray, 1840 (Gastropoda,
Heterobranchia, Heterostropha) está composta por gastrópodes
marinhos normalmente encontrados em sedimentos do mediolitoral
ou dragados durante expedições oceanográficas em profundidades
variadas, sendo os seus representantes muito pequenos, alguns
apresentando dimensões microscópicas. A principal característica
conquiológica diagnóstica da família é a presença de uma
protoconcha heterostrófica sinistra e teleoconcha destrógira. A
protoconcha é posicionada de modo a formar com o eixo da
teleoconcha um ângulo que varia de 90º a 180º. O material
utilizado nesse estudo teve as seguintes origens: 1, material
obtido através de coletas manuais realizadas ao longo do
mediolitorial do Estado de Pernambuco, 2, dragagens realizadas
durante a expedição oceanográfica Canopus , efetuada na
plataforma continental do Nordeste do Brasil, entre os Estados
do Ceará e Sergipe; 3, dragagens procedentes de mar profundo
durante os cruzeiros realizados pelo navio Oceanográfico
Almirante Câmara, realizadas ao largo da plataforma continental
da margem Leste do Brasil (Platô Marginal de Pernambuco; 4,
dragagens efetuadas pelo barco pesqueiro Natureza
(CEPENE/IBAMA), dentro do Programa Revizee-prospecção, entre os
Estados de Pernambuco e Sergipe. A triagem do material
conquiológico foi feita sob microscópio estereoscópico, sendo as
conchas analisadas em microscópio eletrônico de varredura (MEV).
O estudo da morfometria multivariada e da filogenia levou em
consideração a análise de 21 variáveis lineares, cinco variáveis
angulares, além das relações. morfométricas, índices
conquiológicos, dados merísticos e descritivos, os quais foram
analisados por métodos estatísticos descritivos e multivariados.
As análises das dispersões morfológicas serviram para testar a
hipótese sistemática da afinidade conquiológica dentro de táxons
correlacionados. O estudo sistemático possibilitou a identificação de 51 espécies pertencentes a 22 gêneros de
Pyramidellidae. Dentre os táxons estudados, 28 espécies e oito
gêneros, não estavam registrados para a costa do Brasil. Uma
análise morfológica parcimoniosa não pode ser definida
inteiramente para todos os táxons estudados, porém uma grande
parcela dos caracteres explicou a forte relação conquiológica
existente entre eles. É recomendado o uso da análise
multivariada para o reconhecimento e agrupamento da morfologia
nas subfamílias Pyramidellinae e Odostominae
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Moles, Sánchez Juan. "Antarctic heterobranch molluscs: diving into their challenging ecology, taxonomy, and systematics." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/399046.
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This thesis covers three important aspects of Antarctic heterobranchs: ecology, taxonomy, and systematics. The first section deals with ecological interactions of several nudibranchs. In Chapter 1, we chemically characterize a new natural product (a homosesterterpene) called granuloside, from Charcotia granulosa Vayssière, 1906; remarkably, this is the first record of this type of compound in marine organisms. In Chapter 2, we assess the origin, function, and distribution of granuloside in this nudibranch; we found glandular structures probably responsible for storing granuloside, as a defensive mechanism against predators, like the sympatric starfish, Odontaster validus Koehler, 1906. We also hypothesize that granuloside is de novo biosynthesized by C. granulosa. This chapter reflects how organisms from polar latitudes have similar defensive strategies to those of temperate and tropical zones. In Chapter 3, a new species of ectosymbiont copepod, Anthessius antarcticus n. sp., living on C. granulosa is described. This is the first record of such association in Antarctica and the first time that this copepod genus has been found living on a nudibranch. In Chapter 4, we study the development of two anthobranchs, Doris kerguelenensis (Bergh, 1884) and Bathydoris hodgsoni Eliot, 1907, both with intracapsular development; we provide new data on the egg masses characteristics, and embryos morphology and anatomy, throughout their development; we also studied at which ontogenetic stage their natural products appear. We concluded that both nudibranchs exhibit developmental periods of up to several years; their embryos are physically defended by a thick egg capsule, while juveniles already rely on de novo biosynthesized defensive compounds. In the second section of this thesis, our interdisciplinary taxonomic and systematic studies, including histology, tomography, electron microscopy, and molecular tools, allowed us to describe three new species of heterobranchs. In Chapter 5, we provide integrative taxonomic evidence for the establishment of a new family (Newnesiidae), and the description of a new species of Cephalaspidea (Newnesia joani n. sp.) with eurybathic and circumpolar distribution; this discovery traces the origin of the cephalaspideans (distributed worldwide) to Antarctica. In Chapter 6, we performed a three-dimensional (3D) anatomical reconstruction and compared the two nudibranchs Doto antarctica and the new species Doto carinova n. sp.; their phylogeny reveals intriguing questions concerning the development of the reproductive system in this genus; 3D reconstructions reveal also the presence of probable giant neurons associated with the nervous system, which were unknown in this genus so far. Finally, in Chapter 7 we provide new evidence of bipolar geographic distributions by describing a new species of nudibranch, Doridunculus punkus n. sp., using only non-destructive tomographic techniques. Our results highlight both the need and the relevance of multidisciplinary approaches to study biodiversity and ecological interactions in heterobranch molluscs from a poorly studied area of the planet, such as Antarctica.<br>Esta tesis doctoral abarca tres aspectos relevantes de los heterobranquios antárticos: su ecología, taxonomía y sistemática. La primera sección trata sobre interacciones ecológicas en varios nudibranquios. En el capítulo 1, caracterizamos químicamente un nuevo producto natural (un homosesterterpeno) denominado granuloside, de Charcotia granulosa Vayssière, 1906; cabe destacar que ésta es la primera vez que se halla este tipo de compuestos en organismos marinos. En el capítulo 2, evaluamos el origen, función y distribución del granuloside en dicho nudibranquio; hallamos estructuras glandulares probablemente encargadas de acumular granuloside como mecanismo defensivo frente a depredadores, como la estrella de mar Odontaster validus Koehler, 1906. Además, sugerimos que C. granulosa biosintetiza granuloside de novo. Este capítulo refleja cómo los organismos de latitudes polares poseen estrategias defensivas similares a los de las zonas templadas y tropicales. En el capítulo 3, se describe una nueva especie de copépodo, Anthessius antarcticus n. sp., ectosimbionte de C. granulosa; este es el primer registro de este tipo de asociaciones en la Antártida y la primera vez que se describe este género viviendo en un nudibranquio. En el capítulo 4, estudiamos el desarrollo de dos antobranquios, Doris kerguelenensis (Bergh, 1884) y Bathydoris hodgsoni Eliot, 1907, con desarrollo intracapsular; aportamos nuevos datos morfológicos y anatómicos sobre las puestas, huevos y embriones a lo largo de su desarrollo; también estudiamos el estadio ontogenético en el que aparecen sus productos naturales; concluimos que ambas especies tienen periodos de desarrollo de varios años, sus embriones se defienden físicamente gracias a la gruesa cápsula del huevo, mientras que los juveniles ya sintetizan sus propios compuestos defensivos. En la segunda sección de la tesis, nuestros estudios taxonómicos y sistemáticos interdisciplinares, incluyendo técnicas de histología, tomografía, microscopía electrónica y moleculares, han permitido la descripción de tres especies nuevas de heterobranquios. En el capítulo 5, se aporta evidencia taxonómica para establecer una nueva familia (Newnesiidae), y la descripción de una nueva especie de Cephalaspidea (Newnesia joani n. sp.) con distribución euribática y circumpolar; este descubrimiento traza el origen de los cefalaspideos (distribuidos en todo el mundo) hasta la Antártida. En el capítulo 6, realizamos una reconstrucción anatómica tridimensional (3D) y comparamos los dos nudibranquios Doto antarctica y la nueva especie Doto carinova n. sp.; su filogenia revela interesantes cuestiones relativas a la evolución del sistema reproductivo en este género; además, las reconstrucciones 3D revelan la existencia de posibles neuronas gigantes asociadas al sistema nervioso, hasta ahora desconocidas en este género. Por último, en el capítulo 7, proporcionamos nuevas pruebas de una distribución geográfica bipolar, mediante la descripción de una nueva especie de nudibranquio, Doridunculus punkus n. sp., usando exclusivamente técnicas tomográficas no destructivas. Nuestros resultados ponen de manifiesto la necesidad y la relevancia de utilizar enfoques multidisciplinares para el estudio de la biodiversidad y las interacciones ecológicas en moluscos heterobranquios, en especial en un continente todavía poco estudiado, como es la Antártida.
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Jörger, Katharina Verfasser], and Michael [Akademischer Betreuer] [Schrödl. "Tracing evolution : Molecular phylogeny of Acochlidia (Heterobranchia,Gastropoda) / Katharina Jörger. Betreuer: Michael Schrödl." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1065180365/34.
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Jörger, Katharina [Verfasser], and Michael [Akademischer Betreuer] Schrödl. "Tracing evolution : Molecular phylogeny of Acochlidia (Heterobranchia,Gastropoda) / Katharina Jörger. Betreuer: Michael Schrödl." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1065180365/34.
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Undap, Nani Ingrid Jacquline [Verfasser]. "Biodiversity of Marine Heterobranchia (Gastropoda) around North Sulawesi Indonesia / Nani Ingrid Jacquline Undap." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1219139971/34.
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Legendre, Marc. "Potentialités aquacoles des Cichlidae (Sarotherodon melanotheron, Tilapia guineensis) et Claridae (Heterobranchus longifilis) autochtones des lagunes ivoiriennes." Montpellier 2, 1991. http://www.theses.fr/1991MON20295.
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Après une description des étapes de présélection et de sélection des espèces d'intérêt potentiel pour la pisciculture dans les eaux saumâtres africaines, les potentialités aquacoles de trois espèces sélectionnées a partir de l'ichtyofaune de la lagune Ebrié (Côte d'Ivoire), deux tilapias (Sarotherodon melanotheron, Tilapia guineensis) et un silure (Heterobranchus longifilis), sont analysées et comparées. L'étude de la reproduction-biologie, stratégie et contrôle a été privilégiée. La dynamique des ovaires, la taille ou l'âge de première maturation sexuelle, les cycles saisonniers et la fécondité sont décrits pour les trois espèces en milieu d'élevage. Pour les tilapias, une comparaison des principaux traits de la sexualité des femelles d'élevage et du milieu naturel est effectuée. Les contraintes associées au contrôle de la reproduction pour l'obtention massive d'alevins en captivité varient selon les espèces: pour les tilapias, il s'agit de gérer une reproduction qui s'effectue spontanément en captivité, alors que pour le silure des techniques d'induction hormonale de l'ovulation, de fécondation artificielle et d'élevage larvaire ont été établies. L'état actuel des filières d'élevage, telles qu'elles ont été développées et ajustées en fonction des particularités biologiques propres a chaque espèce est présente. Pour S. Melanotheron, un élevage extensif en « acadja-enclos » apparait prometteur alors que pour H. Longifilis, un élevage intensif, base sur l'utilisation d'aliments composes, apparait le plus favorable
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Mendivil, Malpica Alejandro. "Revisión taxonómica de las especies del género Aplysia (Gastropoda: Heterobranchia) de la costa peruana." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2021. https://hdl.handle.net/20.500.12672/17192.
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Aplysia es un género de moluscos gasterópodos que actualmente agrupa 45 especies
válidas, conocidas como liebres marinas, con una distribución tropical y subtropical en los
mares del mundo. Aplysia ha sido ampliamente usada como organismo modelo en
neurociencia por sus neuronas gigantes y su sistema nervioso relativamente simple, y ha
sido objeto de numerosas investigaciones sobre su ecología, fisiología, estrategias
defensivas y productos naturales. Aunque se describieron 5 especies de Aplysia para Perú
en el siglo XIX, no se han realizado estudios posteriores que incluyan un examen de
ejemplares frescos colectados en Perú y una revisión crítica de las descripciones originales
de estas especies. En consecuencia, la diversidad del género en Perú es poco conocida y
se ha propuesto hasta 8 especies para aguas peruanas, en muchos casos sin localidades
confirmadas, lo que enfatiza la necesidad de una revisión sistemática de estas especies.
En este trabajo, se revisa el estado taxonómico de las especies del género Aplysia en el
Perú en función de los caracteres morfológicos con énfasis en la anatomía de los principales
sistemas. En Perú se reconocen cinco especies, incluida la especie recientemente descrita
del subgénero Pruvotaplysia, Aplysia hooveri. Las otras cuatro especies son endémicas del
Perú: dos del subgénero Aplysia: Aplysia nigra y Aplysia sp. 1, y dos del subgénero Varria:
Aplysia inca y Aplysia chierchiana. Se realizó una detallada redescripción morfológica y se
discute la sinonimia, historia taxonómica y distribución para cada especie. Las especies se
han distinguido por la forma corporal, el color y la ornamentación del cuerpo (por ejemplo,
puntos negros), el pie, parapodios, abertura del manto, sifón anal, abertura de la glándula
opalina, concha, rádula, mandíbulas y morfología del pene. Aplysia nigra se reconoce
fácilmente como un animal negro y robusto, con parapodios fusionados posteriormente,
abertura del manto pequeña, pie ancho, pero sin formar una ventosa, sifón anal corto y
aplanado, concha aplanada con seno anal superficial, y saco y base del pene con protuberancias espinosas. Aplysia sp. 1 probablemente es una nueva especie, con un
cuerpo suave, marrón oliva, concha con seno anal cóncavo, y sifón anal corto y tubular;
pero en el resto de los caracteres se parece mucho a A. nigra. Aplysia inca y A. chierchiana
comparten la mayoría de características como la forma del cuerpo, concha, rádula,
mandíbulas y pene; sin embargo, pueden distinguirse por los puntos negros que cubren los
parapodios y la región cefálica de A. chierchiana. Es necesario corroborar las conclusiones
de este trabajo utilizando datos moleculares y comparando las especies peruanas con el
resto de especies de Aplysia del Pacífico Oriental, especialmente con las especies de
California.<br>Perú. Universidad Nacional Mayor de San Marcos. Vicerrectorado de Investigación y
Posgrado. Programa de Proyectos de Investigación para Grupos de Investigación. B17102141-PCONFIGI.<br>Perú. Universidad Nacional Mayor de San
Marcos. Vicerrectorado de Investigación y
Posgrado. Programa de Promoción de Tesis
de Pregrado. B18100594- PTPGRADO.
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Melo, Marlon Delgado. "Opistobr?nquios (mollusca: heterobranchia) do Rio Grande do Norte, Brasil, incluindo 34 novas ocorr?ncias." Universidade Federal do Rio Grande do Norte, 2015. http://repositorio.ufrn.br/handle/123456789/20348.
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Previous issue date: 2015-05-29<br>A taxonomia ? a base de qualquer ci?ncia que envolva biodiversidade, como a ecologia e biogeografia. Entre os invertebrados marinhos, os moluscos gastr?podes s?o um dos grupos mais diversos. O grupo ?Opistobranchia? apresentam redu??o, internaliza??o ou aus?ncia da concha calc?ria, e apresenta tamb?m a maior diversidade de formas entre os gastr?podes. Estima-se que existam entre 5000 e 6000 esp?cies em todo globo terrestre, dentre estas, aproximadamente 235 s?o reportadas para o Brasil, com apenas 12 registradas para o estado do Rio Grande do Norte. O presente projeto visa o levantamento taxon?mico dos opistobr?nquios no litoral do estado do Rio Grande do Norte, Brasil. Para isto foram realizadas expedi??es ?s praias do litoral deste estado. Alguns opistobr?nquios foram coletados diretamente no campo, enquanto outros foram separados em laborat?rio de substratos coletados (i.e., macroalgas, cascalho e pequenas rochas soltas). As coletas se deram manualmente sobre os arrecifes na regi?o entre-mar?s, ou atrav?s de mergulhos livres e aut?nomos (sublitoral). As esp?cies encontradas foram medidas e fotografadas in vivo no Laborat?rio Did?tico II do Departamento de Bot?nica, Ecologia e Zoologia da UFRN. A identifica??o dos esp?cimes foi feita atrav?s da compara??o dos caracteres diagn?sticos de cada grupo, embasada na literatura espec?fica. Foram encontrados 34 novos registros para o litoral do RN, dentre estes, quatro novos registros tamb?m para o nordeste, assim como tr?s novas ocorr?ncias para o Brasil e Atl?ntico Sul. O presente levantamento contribuiu, portanto, para uma melhor estimativa da fauna de opistobr?nquios do litoral norte rio-grandense. Acredita-se que s?o necess?rios mais estudos que envolvam diferentes aspectos ecol?gicos, biol?gicos e biogeogr?ficos dos opistobr?nquios no Brasil e especialmente no Nordeste.<br>The taxonomy is the foundation of any science involving biodiversity, such as ecology and biogeography. Among marine invertebrates, mollusks gastropods are among the most diverse groups. The subgroup ?Opisthobranchia? have a reduction, or absence internalization of calcareous shell and also has the highest diversity of forms of gastropods. It is estimated that there are between 5000 and 6000 species around the globe, among these, are reported to approximately 235 Brazil, with only 12 recorded for the state of Rio Grande do Norte. This project aims to taxonomic survey of opistobr?nquios the coast of Rio Grande do Norte, Brazil. For this were carried out expeditions to the coastal beaches of this state. Some opistobr?nquios were collected directly in the field, while others were separated in laboratory collected substrates (ie, macroalgae, gravel and small loose rocks). The collections are given manually on the reefs in the region intertidal, or through free and scuba diving (sublitoral). The species found were measured and photographed in vivo in laboratory Didactic II of the Department of Botany, Ecology and Zoology at UFRN. The identification of specimens was made by comparing the diagnostic characters of each group, based on the literature. 34 new records for the coast of the infants were found, among them, four new records as well to the northeast, as well as three new records for Brazil and the Southern Atlantic. This survey contributed thus to a better estimate of opistobr?nquios fauna of North coast Rio Grande. It is believed that more studies are needed involving different ecological, biological and biogeographical aspects of opistobr?nquios in Brazil and especially in the Northeast.
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Campbell, Matthew R. "Systematics and phylogenetics of the family Streptacididae (Gastropoda: Heterobranchia) from Devonian through Triassic marine strata." [Bloomington, Ind.] : Indiana University, 2004. http://wwwlib.umi.com/dissertations/fullcit/3162227.
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Thesis (Ph.D.)--Indiana University, Dept. of Geological Sciences, 2004.<br>Title from PDF t.p. (viewed Dec. 1, 2008). Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0172. Co-Chairs: N. Gary Lane; Lisa M. Pratt.
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SANTOS, Franklin Noel dos. "A subfamilia turbonillinae Brown, 1849 (Gastropoda, Heterobranchia, Heterostropha) na margem continental do Nordeste do Brasil." Universidade Federal de Pernambuco, 2002. https://repositorio.ufpe.br/handle/123456789/8550.
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Previous issue date: 2002<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Informa-se o resultado dos estudo sistemático, ecológico e biogeográfico dos Mollusca, Gastropoda, Turbonillinae, presentes na Margem Continental do Nordeste do Brasil. Os espécimens analisados foram adquiridos através das coleções do Museu de Malacologia Rosa de Lima Silva Mello/Departamento de Pesca da Universidade Federal Rural de Pernambuco e do Laboratório de Bentos/Departamento de Oceanografia da Universidade Federal de Pernambuco. Esse material é proveniente de coletas manuais, mergulho autônomo e através de dragagens realizadas por Navios Oceanográficos e Barcos Pesqueiros. Os exemplares coligidos foram submetidos em laboratório a triagem em microscópio estereoscópico e identificados com a comparação da série-tipo e fotointepretação dos mesmos em alguns casos, e da literatura malacológica. Foram analisados 1025 espécimens em 133 amostras que resultou na identificação de 45 espécies, sendo elas: T. abrupta Bush, 1899, T. atypha Bush, 1899, T. fasciata (Orbigny, 1840), T. multicostata (C. B. Adams, 1850), T. brasiliensis Clessin, 1900, T. coomansi Aartsen, 1994, T. pupoides Orbigny, 1842, T. penistoni Bush, 1899, T. arnoldoi Jong & Coomans, 1988, confirmadas para o Nordeste do Brasil, Turbonilla deboeri ?, T. anira P. Barstch in Dall, 1927, T. protracta Dall, 1892, T. rhabdota Watson, 1886, T. krebsii Jong & Coomans, 1988, são reportadas pela primeira vez para a região, T. aff. obsoleta 1, T. aff. obsoleta 2, T. aff. rhabdota, T. aff. unilirata, T. aff. micans, T. atypha 1, T. atypha 2, T. aff. pilsbry, T. aff. myia, T. aff. rushii, T. sp. A, T. sp. B, T. sp. C, T. sp. D, T. sp. E, T. sp. F, T. sp. G, T. sp. H, T. sp. I, T. sp. J, T. sp. K, T. sp. L, T. sp. M, T. sp. N, T. sp. O., T. sp. P, T. sp. Q., T. sp. R, T. sp. S, T. sp., T. sp. U, T. sp. V, T. sp. X, confirmam a grande abundância específica presente na margem Continental. O estudo ainda mostrou que o Estado de Pernambuco foi o que apresentou maior abundância com 40 espécies. A região de talude mortrou-se um pouco mais abundante (29 espécies) que a região de plataforma (26 espécies). As espécies com maior distribuição geográfica foram T. coomansi (6 estados) e T. deboeri (5 estados)
Books on the topic "Heterobranchs"
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Öztürk, Bilal. Shelled marine molluscs of the Turkish coasts: Informal group "Lower heterobranchia" (Mollusca-gastropoda). Ege University Press, 2014.
Find full textBook chapters on the topic "Heterobranchs"
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Nithyanandan, Manickam, Nathalie Yonow, Manal Al-Kandari, Rakhesh Madhusoodhanan, Gopikrishna Mantha, and Fathima Thuslim. "An annotated checklist of heterobranch molluscs of the Arabian Gulf and their zoogeographic affinities with adjacent seas." In Coral Reefs and Associated Marine Fauna around the Arabian Peninsula. CRC Press, 2024. http://dx.doi.org/10.1201/9781003321392-15.
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Antit, Mouna, Donia Kalthoumi, Marta Pola, Javier Urra, and Atf Azzouna. "First Record of Doris verrucosa Linnaeus, 1758 (Mollusca: Heterobranchia: Nudibranchia) in the bay of Tunis, Tunisia (Central Mediterranean)." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_424.
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Wägele, Heike, Annette Klussmann Kolb, Verena Vonnemann, and Monica Medina. "Heterobranchia I." In Phylogeny and Evolution of the Mollusca. University of California Press, 2008. http://dx.doi.org/10.1525/california/9780520250925.003.0014.
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Ponder, Winston F., David R. Lindberg, and Juliet M. Ponder. "Gastropoda III – The Heterobranchia." In Biology and Evolution of the Mollusca. CRC Press, 2020. http://dx.doi.org/10.1201/9781351115254-9.
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Mordan, Peter, and Christopher Wade. "Heterobranchia II: The Pulmonata." In Phylogeny and Evolution of the Mollusca. University of California Press, 2008. http://dx.doi.org/10.1525/california/9780520250925.003.0015.
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Wàgele, Heike, Annette Klussmann-Kolb, Verena Vonnemann, and Monica Medina. "14. HETEROBRANCHIA I: THE OPISTHOBRANCHIA." In Phylogeny and Evolution of the Mollusca. University of California Press, 2008. http://dx.doi.org/10.1525/9780520933705-016.
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Mordan, Peter, and Christopher Wade. "15. HETEROBRANCHIA II: THE PULMONATA." In Phylogeny and Evolution of the Mollusca. University of California Press, 2008. http://dx.doi.org/10.1525/9780520933705-017.
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Schaefer, Kurt. "Development and homologies of the anal gland in haminaea navicula (da costa, 1778) (opisthobranchia, bullomorpha)." In Origin and Evolutionary Radiation of the Mollusca. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780198549802.003.0021.
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Abstract In order to establish the monophyly of the Heterobranchia, Haszprunar (1985, 1988) and Robertson (1985) used pig- meneted anal glands as a synapomorphic character of allogastropods, opisthobranchs and pulmonates. Both authors used different terms for homologous structures and restricted the homology of pigmented and unpigmented anal glands. The anal glands of gastropod veligers consist of conspicuous large vacuolated gland cells which are situated in the mantle cavity, dorsally and ventrally to the hindgut. Secretions of the dorsal gland might be of various colours or even unpigmented (e.g. Hamatani, 1960a,b, 1961a,b; Usuki, 1966).
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Ble, Célestin Mélécony, Olivier Assoi Etchian, Athanase Kraidy Otchoumou, Jean Noel Yapi, and Laurent Alla Yao. "Effects of Dietary Palm Oil on the Whole-Body Mineral Composition of African Catfish, Heterobranchus longifilis (Teleostei, Clariidae)." In Palm Oil. InTech, 2018. http://dx.doi.org/10.5772/intechopen.76615.
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"Gly ptothorax, Cetopsis, Nematogenys, Trichomycterus, Hatcheria, Amphilius, Paramphilius, Andersonia, Belonoglanis, Doumea, Phractura, Trachyglanis, Leptoglanis, Zaireichthys, Clarias, Uegitglanis, Heterobranchus, Heteropneustes)." In Morphological Evolution, Adaptations, Homoplasies, Constraints, and Evolutionary Trends. CRC Press, 2004. http://dx.doi.org/10.1201/9781482280081-17.
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