Thyasira tortuosa ( Jeffreys, 1881 )

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 : 50

publication ID	https://doi.org/10.5281/zenodo.274249
DOI	https://doi.org/10.5281/zenodo.5657681
persistent identifier	https://treatment.plazi.org/id/F6431C34-F712-E57E-FF27-FF64639F8E09
treatment provided by	Plazi (2016-04-05 06:56:08, last updated 2024-11-27 06:10:18)
scientific name	Thyasira tortuosa ( Jeffreys, 1881 )
status

Treatment

Thyasira tortuosa ( Jeffreys, 1881)

(Fig. 27)

Material examined. One live-collected specimen, TTR16 cruise, station AT 622Gr, Porto mud volcano, Gulf of Cadiz, 35º 33.773N, 09º 30.416W, 3902 m, 3 June 2006 ( DBUA 00830.01).

Remarks. The only specimen examined is provisionally identified as Thyasira tortuosa and has the characteristically compressed and anteriorly expanded outline noted by Payne and Allen (1991). The shell from Gulf of Cadiz (5.5 mm) is much larger than any of the shells described by these authors (3.2 mm) and comes from a greater depth: 3902m whilst the maximum given by Payne & Allen (1991) was 2359 m. Dufour (2005) did not examine this species but the Gulf of Cadiz specimen has a Type 2 gill with both demibranchs. The gills are rather thick and have the same appearance as the ones that exhibit strong bacterial symbiosis such as T. flexu osa and T. gouldi .

References

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

Jeffreys, J. G. (1881) On the Mollusca procured during the H. M. S. Lightning and Porcupine expedition (Part 3). Proceedings of the Zoological Society of London (1881), 693 - 724.

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.