Species Account

Nuculana pernula (Müller, 1779)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Nuculana pernula (Müller, 1779)

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 28mm. Shell Structure: Thin, brittle. Equivalve: Equivalve. Equilateral: Inequilateral, the beaks lie approximately 65% of dorsal margin length from posterior. Tumidity: Moderately tumid. Outline: Elongate-oval with a long, truncated rostrum: antero-dorsal margin rounded and sloping, anterior end deeply rounded; postero-dorsal margin long and slightly concave, postero-ventral margin slightly concave; escutcheon indistinct, elliptical with scarcely defined edges, very slightly raised; lunule long, lanceolate, conspicuously raised with well defined, raised, moderately sharp edges (more rounded in older shells); a second well defined ridge radiates posteriorly to form the rostrum which has a rounded end. Contour: Rostrate.

Sculpture: Fine, well defined, regularly-spaced raised concentric ridges, and coarser, irregular growth stops. Margin: Smooth. Ligament: Internal, opisthodetic, with a rounded triangular ligament seated in a well-developed resilifer. Hinge: Taxodont: relatively solid, continuous hinge plate, anterior part curved (convex), narrow below the beaks, broadening towards the anterior end. Posterior part long and concave. Hinge plate with a well-developed resilifer. Teeth, chevron-shaped, moderately long and pointed, usually 19 posterior and 16 anterior of the resilifer. Pallial Musculature: Pallial sinus shallow and indistinct. Periostracum: Silky, pale olive green to dark olive brown. Colour: White.

Distribution & Ecology

A northern species ranging south to to the northern North Sea at outer shelf and shelf edge depths. Also recorded from greater depths on the slope off Ireland but these may be based on valves only or subfossil shells.

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

Additional Information & Related Species


Listed are literature citing Nuculana pernula (Müller, 1779). Reference containing the species Type Description is highlighted.

Müller O F 1779. Von zwoen wenig bekannten Muscheln, der Schinkenarche und der gerunzelten Mahlermuschel IV. Beschäftigungen der Berlinischen Gesellschaft naturforschender Freunde. 57.


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Record last modified: 22/03/2016