Thyasira obsoleta ( Verrill & Bush, 1898 )

Rodrigues, Clara F., Oliver, Graham & Cunha, Marina R., 2008, Thyasiroidea (Mollusca: Bivalvia) from the mud volcanoes of the Gulf of Cadiz (NE Atlantic), Zootaxa 1752, pp. 41-56 : 49

publication ID	https://doi.org/10.5281/zenodo.274249
DOI	https://doi.org/10.5281/zenodo.5657679
persistent identifier	https://treatment.plazi.org/id/F6431C34-F713-E57F-FF27-FA96609F8BC7
treatment provided by	Plazi (2016-04-05 06:56:08, last updated 2024-11-27 06:10:18)
scientific name	Thyasira obsoleta ( Verrill & Bush, 1898 )
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Thyasira obsoleta ( Verrill & Bush, 1898)

(Fig. 26)

Material examined. All from Gulf of Cadiz; two live-collected specimens, MSM01-03, stn 145 GKG3, Porto mud volcano, 35º33.699'N, 09º30.437'W, 3860 m, 21 April 2006 ( DBUA 00831.01); one live-collected specimen MSM01-03, stn 190 MUC8, Captain Arutyunov mud volcano, 35º39.665'N, 07º19.970'W, 1322 m, 28 April 2006 ( DBUA 00831.02); one live-collected specimen, MSM01-03, stn 241 GKG12, Mercator mud volcano, 35º17.918'N, 06º38.717'W, 353 m, 6 May 2006 ( DBUA 00831.03); one live-collected specimen MSM01-03, stn 169 MUC7, Carlos Ribeiro mud volcano, 35º47.256'N, 08º25.361'W, 2199 m, 25 April 2006 ( DBUA 00831.04).

Remarks. All specimens are very small (not exceeding 2.0 mm) but exhibit the characteristically weakly sulcate posterior and angular outline. This is a common and widespread species recorded from across the Atlantic Ocean in depths from 24 to 2900 m ( Payne & Allen 1991). It has not been associated with any particular reducing environment. Dufour (2005) classified this as having Type 2 gills with both demibranchs but showing no evidence of bacterial symbiosis.

References

Dufour, S. (2005) Gill anatomy and the evolution of symbiosis in the bivalve family Thyasiridae. Biological Bulletin, 208, 200 - 212.

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 B, 334, 481 - 562.

Verrill, A. E. & Bush K. J. (1898) Revision of the deep-water Mollusca of the Atlantic coast of North America, with descriptions of new genera and species. Proceedings of the United States National Museum, 20, 775 - 901.