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
scientific name	Thyasira obsoleta ( Verrill & Bush, 1898 )
status

Treatment

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.