Species Account

Yoldiella frigida (Torell, 1859)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Yoldiella frigida (Torell, 1859)

Notes on Nomenclature

Nuculanidae in place of Yoldiidae
Killeen & Turner (2009) use Nuculanidae instead of Yoldiidae in agreement with Ockelmann & Warén (1998) who explan that the distinguishing characters between these two families has never been well documented. Until the Yoldiidae can be clearly distinguished from the Nuculanidae we shall treat them under the single family Nuculanidae.

To size: To 5mm. Shell Structure: Moderately thin. Equivalve: Equivalve. Equilateral: Roughly equilateral, beaks situated at, or slightly anterior of midline. Tumidity: Moderately inflated. Outline: Deeply-oval: height of shell approximately 75-80% of length; antero-dorsal and postero-dorsal margins gently sloping; postero-dorsal margin slightly the longer; anterior margin narrowly rounded; lower posterior margin obliquely truncated and weakly rostrate (flexured) in larger specimens; posterior extremity lies well above the horizontal midline; ventral margin very deeply rounded, lowest point posterior of the midline. Umbo small, relatively narrow, slightly pointed, projecting just above the dorsal margin.

Sculpture: Very weak striations, with growth ridges. Margin: Smooth. Ligament: Amphidetic, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Hinge: Taxodont: moderately strong, up to 8 chevron-shaped teeth on either side of the ligament. Periostracum: Silky, slightly irridesecent, straw-coloured, sometimes with darker coloured bands. Colour: Translucent white. Additional Characters: The hind-gut forms a rounded loop on the right side of the body.

Distribution & Ecology

Uncertain due to confusion with Y. solidula. Recorded from Rockall Trough, and west of the Outer Hebrides in 609-619m.
North Atlantic and high Arctic mostly in 10-100m depth.

Depth Range
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)

Additional Information & Related Species


Listed are literature citing Yoldiella frigida (Torell, 1859). Reference containing the species Type Description is highlighted.

Allen, J.A., Sanders, H.L. & Hannah, F. 1995. Studies on the deep-sea Protobranchia (Bivalvia); the subfamily Yoldiellinae. Bulletin of the British Museum of Natural History. 61: 11-90.
Killeen I.J. & Turner J. 2009. Yoldiella and Portlandia (Bivalvia) from the Faroe-Shetland Channel and Rockall Trough, Northeast Atlantic. Journal of Conchology. 39 (6): 733-778.
Torell O M 1859. Bidrag till Spitsbergen Mollusk-fauna. Jemte en allman oversigt af Arktiska regionens naturforahallanden och forntida ubtredning Boktrycheri, Stocholm. 118.


  • 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: 06/05/2016