Species Account

Yoldiella lenticula (Møller, 1842)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Yoldiella lenticula (Møller, 1842)

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 7mm. Shell Structure: Solid but not robust. Equivalve: Equilateral. Equilateral: Moderately inequilateral, the beaks lie at least 40% of dorsal margin length from anterior. Becomes more inequilateral with growth. Tumidity: Inflated. Outline: Elongate-oval: dorsal margins crimped either side of the umbo; antero-dorsal margin short and gently sloping; postero-dorsal margin longer, slightly convex, gently sloping; posterior margin narrowly rounded; anterior margin more broadly rounded; ventral margin long, deeply rounded. Umbo broad, rounded, prominent, projecting just above the dorsal margin, situated distinctly anterior of midline.

Sculpture: Very weak concentric striations and more prominent, irregular growth ridges. Margin: Smooth. Ligament: Amphidetic, with the ligament seated within a socket below the beak in a developed resilifer. Hinge: Taxodont: long, broad, continuous, curved hinge plate with at least 11 chevron-shaped teeth on either side of the ligament, posterior row of teeth longer than anterior row. Periostracum: Slightly glossy, yellowy-brown. Colour: White. Additional Characters: The hind-gut forms a simple, rounded loop on the right side of the body.

Distribution & Ecology

Known from the West European basin mostly from a small geographic area from 43° to 48° N and 3° to 10° W in depths from 1400-2245m.
Panarctic, south to northern Norway and Iceland in depths of 10-300m. Also known from deep water north Atlantic basins (West European and Canary) in depths from 1400-2245m.
This species displays “equatorial submergence” being found at much greater depths in the south of its range. The absence of records from the Faroe-Shetland Channel and Hebrides terrace may suggest that the taxonomy requires investigation but the anomaly be simply be due to under-recording.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species


Listed are literature citing Yoldiella lenticula (Møller, 1842). 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.
Møller H O 1842. Index Molluscorum Groenlandiae. Naturhistorisk Tidsskrift, Kjøbenhavn. 4(1): 76-97.


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Record last modified: 22/03/2016