Species Account

Yoldiella propinqua (Leche, 1878)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Yoldiella propinqua (Leche, 1878)

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 5.5mm. Shell Structure: Larger specimens relatively solid but smaller individuals moderately thin and fragile. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just in front of midline. Becomes more inequilateral with growth. Tumidity: Moderately tumid. Outline: Oval, occasionally sub-rostrate in larger specimens; antero-dorsal margin short, gently sloping; anterior margin rounded to narrowly rounded; postero-dorsal margin long, slightly curved, gently sloping; lower posterior margin obliquely truncated and slightly indented (rostrate in larger specimens); ventral margin deeply rounded. Umbo relatively prominent, broad, rounded, projecting well above the dorsal margin, anterior of midline.

Sculpture: Virtually smooth with only very faint, closely spaced concentric lines. Margin: Smooth. Ligament: Amphidetic, with the ligament seated within a socket below the beak in a triangular formed resilifer. Hinge: Taxodont: Hinge plate broad, continuous with 12-13 chevron shaped teeth, which are drawn up into points, on either side of the ligament. Periostracum: Glossy, straw coloured. Colour: Translucent white. Additional Characters: The hind-gut forms a simple, rounded loop on the right side of the body.

Distribution & Ecology

North and west of Scotland from northeast of Rosemary Bank to northeast of Shetland in depths from 417 to 1624m, but most common in 800-1200m.
Widespread in the north Atlantic and Arctic (possibly circumpolar) occurring from west Greenland to Norway and the Kara Sea and east to the Laptev Sea. Around the Faroes it is found in depths from 402-1098m

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

Additional Information & Related Species


Listed are literature citing Yoldiella propinqua (Leche, 1878). 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.
Leche W 1878. Öfversigt öfver de av svenska expeditionerna till Novaya Semlja och Jenissei 1875 och 1876 insamlade hafsmollusker. Kungliga Svenska Vetenskaps-Akademiens Handlingar, N.F.. 10: 1-86.


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Record last modified: 22/03/2016