“TUBULAR GILLS” Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)

Oliver, Graham

doi:10.3897/zse.90.8323

Cited by 10 publications

(14 citation statements)

References 17 publications

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“…The current taxonomy of the Thyasiroidea is unclear as it rests on few morphological characters and is not supported by molecular data (Oliver & Sellanes, 2005). Of the 103 species recognized almost half (49) are assigned to Thyasira s. l. (Oliver, 2013). However, Oliver & Sellanes (2005) and subsequently Oliver & Holmes (2006) and Rodrigues et al (2008) all suggested that there is a small clade of rather large species that are restricted to cold seep habitats.…”

Section: Systematicsmentioning

confidence: 99%

New species of chemosymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton–Rockall Basin, north-east Atlantic

Oliver

Drewery

2013

J. Mar. Biol. Ass.

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Two new species of chemosymbiotic bivalves are described from a poorly localized site in the Hatton–Rockall Basin at 1187–1200 m. The new speciesIsorropodon mackayisp. nov. is compared with others of the genus from the North and South Atlantic. A novel anatomical structure, suggested to be a secondary gill, is described. The second bivalveThyasira scotiaesp. nov. is compared with other species known to inhabit cold seeps in the Atlantic and most resemblesThyasira sarsi. Other than the minor morphological differences, the bathyal range and presence of commensal polychaetes,Antonbrunnia, never reported inT. sarsisupport the erection of a new species. In the North AtlanticIsorropodonspecies and the larger thyasirids, with the exception ofT. sarsi, are typically found at hydrocarbon seeps associated with pockmarks and mud volcanoes. If correct, then this is the first indication of active sulphidic seepage in the Hatton–Rockall Basin.

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Section: Systematicsmentioning

confidence: 99%

New species of chemosymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton–Rockall Basin, north-east Atlantic

Oliver

Drewery

2013

J. Mar. Biol. Ass.

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“…The shells are associated with gas hydrate, methane saturated sediments and authigenic carbonates (Edwards et al 2011, Hart et al 2011, Lorenson et al 2011, Pohlman et al 2011). This strongly suggests that the bivalves had chemotrophic endosymbionts similar to other bivalves that inhabit active cold vents (Roberts and Carney 1997, Fujiwara et al 2001, Oliver 2014). …”

Section: Materials Methods Abbreviationsmentioning

confidence: 68%

“…Considerable research has been published in the last 15 years on thyasirds from cold seeps and hot vents (Oliver and Sellanes 2005, Oliver and Holmes 2006, 2007b, Oliver and Levin 2006, Taylor et al 2007, Zelaya 2009, Oliver et al 2013, Hryniewicz et al 2014, Oliver 2014) and their associated with chemosynthetic communities, which are now known to be distributed widely throughout the world’s oceans (Sibuet and Olu 1998, Fujikura et al 1999, Fujiwara et al 2001). The Canning Seafloor Mound probably represents a cold seep habitat (Hart et al 2011).…”

Section: Taxonomic Backgroundmentioning

confidence: 99%

A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska

Valentich-Scott¹,

Powell²,

Lorenson³

et al. 2014

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Bivalve mollusk shells were collected in 2350 m depth in the Beaufort Sea, Arctic Ocean off northern Alaska. Initial identification suggested the specimens were a member of the bivalve family Thyasiridae, but no known eastern Pacific or Arctic living or fossil thyasirid resembled these deep-water specimens. Comparisons were made with the type of the genera Maorithyas Fleming, 1950, Spinaxinus Oliver & Holmes, 2006, Axinus Sowerby, 1821, and Parathyasira Iredale, 1930. We determined the Beaufort Sea species represents a new genus, herein described as Wallerconcha. These specimens also represent a new species, herein named Wallerconcha sarae. These new taxa are compared with known modern and fossil genera and species of thyasirds.

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“…Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences (NSCMB FEB RAS). The terminology of the shell morphology and body anatomy of the family Thyasiridae follows Payne & Allen (1991) , Oliver & Killeen (2002) , and Oliver (2014) .…”

Section: Methodsmentioning

confidence: 99%

Three new deep-sea species of Thyasiridae (Mollusca: Bivalvia) from the abyssal plain of the northwestern Pacific Ocean and hadal depths of the Kuril-Kamchatka Trench

Kamenev¹

2020

PeerJ

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The Thyasiridae is the most species-rich family of bivalves in the abyssal and hadal zones of the northwestern Pacific Ocean. In recent years, with at least 14 thyasirid species found in that region at depths exceeding 3,000 m. Some of them are the numerically dominant species in bottom communities. However, all members in that family have not yet been identified to the species level. Based on the material collected from 1953 to 2016 by five deep-sea expeditions, three new species of Thyasiridae (Mollusca: Bivalvia) are described from the abyssal and hadal zones of the northwestern Pacific. “Axinulus” roseus sp. nov. was found in the Kuril-Kamchatka Trench at 9,000–9,583 m depth. This species has a large rhomboidal shell with strong commarginal sculpture, a well defined, long and deep lunule and escutcheon without an auricle, a ctenidium consisting of a single demibranch, extensively lobed lateral pouches, and a large prodissoconch with specific sculpture. It is one of the dominant species in terms of abundance in macrobenthic communities in the deepest basin of the Kuril-Kamchatka Trench with a population density of up to 396 ind. m−2. The species has a shell length of up to 9.0 mm and it is the largest thyasirid with a single demibranch. “Axinulus” oliveri sp. nov. was found in a vast region of the northwestern Pacific on the abyssal plain adjacent to the Kuril-Kamchatka Trench, on the abyssal slope of the Kuril Islands, and in the Kuril-Kamchatka Trench at 4,648–6,168 m depth. This species is characterized by its ovate-rhomboidal shell, a well defined, deep and long escutcheon with a distinct auricle, a ctenidium with a single demibranch, and extensively lobed lateral pouches. It is widespread in the northwestern Pacific and forms populations with a density of up to 36 ind. m−2. Scanning electron microscopic observation of the gills of “A.” roseus sp. nov. and “A.” oliveri sp. nov. revealed that these species are not chemosymbiotic. “Axinulus” roseus sp. nov. and “A.” oliveri sp. nov. are provisionally assigned to the genus Axinulus, because they differ from the type species of the genus in a number of morphological and anatomical features. Parathyasira fragilis sp. nov. was found on the abyssal plain adjacent to the Kuril-Kamchatka Trench at 5,249–5,399 m depth. This species is distinguished by its very thin, fragile, dorsoventrally elongated, rhomboidal shell with very long anterodorsal margin and a long, wide, flat lunule. The taxonomic position of the new species is discussed.

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“TUBULAR GILLS” Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)

Cited by 10 publications

References 17 publications

New species of chemosymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton–Rockall Basin, north-east Atlantic

New species of chemosymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton–Rockall Basin, north-east Atlantic

A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska

Three new deep-sea species of Thyasiridae (Mollusca: Bivalvia) from the abyssal plain of the northwestern Pacific Ocean and hadal depths of the Kuril-Kamchatka Trench

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