Yoldiella frigida (Torell, 1859)
Nuculanoidea : Nuculanidae
Roughly equilateral, beaks situated at, or slightly anterior of midline.
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
North Atlantic and high Arctic mostly in 10-100m depth.
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Nuculanoidea : Nuculanidae
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.
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