Species Account

Thyasira tortuosa (Jeffreys, 1881)

Thyasiroidea : Thyasiridae

Tebble name: n/a
Smith & Heppell name: Thyasira tortuosa (Jeffreys, 1881)

To size: To 7mm. Shell Structure: Thin, translucent. Equivalve: Equivalve. Equilateral: Inequilateral, beaks just behind the midline. Tumidity: A little compressed. Outline: Broadly subovate, distinctly longer than high; anterior dorsal margin long, straight, sloping gently; anterior short, rounded; ventral margin long, gently curved; posterior obliquely truncated; posterior dorsal margin long gently curved. Contour: Auricle absent; submarginal sulcus narrow, shallow but distinct; posterior area flattened or weakly sulcate; posterior angle weak.

Sculpture: Smooth with growth lines. Margin: Smooth. Ligament: External but deeply sunken, extending for 1/4 length of submarginal sulcus. Hinge: Hinge plate weak, slightly thickened anterior of beaks. Pallial Musculature: Muscle scars obscure. Periostracum: Obscure. Colour: Shell white. Additional Characters: 2 demibranchs.

Distribution & Ecology

Sporadic records suggest a bathyal distribution along the Atlantic margin, 800-2000m Anatomy suggests that this species is not chemosymbiotic, probable suspension feeder.

Depth Range
Bathyal (500 - 2000m)

Additional Information & Related Species


Listed are literature citing Thyasira tortuosa (Jeffreys, 1881). Reference containing the species Type Description is highlighted.

Jeffreys J.G. 1881. On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ Expeditions, 1868-70. (Part III). 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 Series B. 334: 481-566.


  • Conchological Society of Great Britain & Ireland
    Provides resources for understanding, identifying, recording, and conserving molluscs
    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.

Image Gallery

Record last modified: 15/01/2014