Genaxinus eumyarius (M Sars, 1870)
Thyasiroidea : Thyasiridae |
| Tebble name: | n/a |
| Smith & Heppell name: | Thyasira eumyaria (M Sars, 1870) |
To size: To 2.5mm. Shell Structure: Fragile. Equivalve: Equivalve. Equilateral: Equilateral. Tumidity: Slightly inflated. Outline: Oval, higher than long, posterior weakly angulate with a short, gently sloping posterior dorsal margin, a steeply sloping posterior margin and weakly angulate, curved ventral margin; anterior dorsal margin straight, steeply sloping into rounded anterior. Contour: Umbos low; auricle indistinct; posterior area flattened but not sulcate.
Sculpture: Of concentric lines with radiating striations within the shell. Margin: Inner margin smooth. Ligament: Ligament sunken, short. Hinge: Hinge weak, teeth absent but anterior hinge plate slightly thickened. Pallial Musculature: Adductor muscle scars raised and extending into umbonal cavity these visible through the shell creating a pair of white rays. Periostracum: Transparent. Colour: White, ferruginous deposits confined to anterior and posterior dorsal areas. Additional Characters: 1 demibranch.
Distribution & Ecology
Gill anatomy – Dufour, 2005.
Gross anatomy – Payne & Allen, 1991.
Depth Range
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Related Species
Thyasiroidea : Thyasiridae
References
Listed are literature citing Genaxinus eumyarius (M Sars, 1870). Reference containing the species Type Description is highlighted.
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Dufour S C 2005. Gill anatomy and the evolution of symbiosis in the bivalve family Thyasiridae. Biological Bulletin. 208: 200-212. |
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Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31. |
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Oliver P G & Killeen I J 2002. The Thyasiridae (Mollusca: bivalvia) of the British continental shelf and North Sea Oilfields. Studies in Marine Biodiversity and Systematics from the National Museum of Wales. BIOMOR Reports. 3: 1-73. |
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Payne C.M. & Allen J.A. 1991. The morphology of deep-sea Thyasiridae (Mollusca: Bivalvia) from the Atlantic Ocean. Philosophical Transactions of the Royal Society of London Series B. 334: 481-566. |
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Sars M 1870. Bidrag til kundskab om Christianiafjordens Fauna. Nyt Magazin for Naturvidenskaberne. 17: 113-232. |
Resources
- Conchological Society
of Great Britain & Ireland
Provides resources for understanding, identifying, recording, and conserving molluscs - CLEMAM
Check List of European Marine Mollusca - MarLIN
The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment. - NBN Gateway
National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers. - BivAToL
- MarBEF
- Malacological Society
- Unitas Malacologica
- Census of Marine Life
- MarBEF
MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.
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