Ennucula tenuis (Montagu, 1808)
Nuculoidea : Nuculidae
Thin but not fragile.
Inequilateral, the beaks lie approximately 20% of dorsal margin length from posterior.
(T:L=1:4 [4.5:18.1]) Moderately inflated.
Ovate triangular: height of shell approximately 75% of length; antero-dorsal margin very long, gently curved and sloping; postero-dorsal margin slightly curved, steeply sloping with angled junction at posterior margin; anterior and ventral margins moderately rounded; escutcheon elongate heart-shaped, projecting, generally with poorly defined edges; lunule long, lanceolate with poorly defined edges, noticeably raised. Umbo slightly swollen.
Sculpture: Primary sculpture of numerous very fine, closely-spaced, concentric lines and some growth stops. Margin: Smooth. Ligament: Internal, opisthodetic, elongate triangular ligament seated in a well-developed resilifer. A thin, barely visible, external ligament lies anterior to the beaks. Hinge: Taxodont: Broad and continuous hinge plate with a well-developed resilifer. Teeth long and pointed, usually 8-10 posterior and 16-18 anterior. The teeth extend across the top of the resilifer. Pallial Musculature: Pallial line continuous with no pallial sinus. Adductor muscle scars oval, more or less equal in size and indistinct. Periostracum: Glossy, grey green, green to dark olive, often darker around the outer margin, sometimes iridescent. Colour: White to bluey grey, slightly nacreous. Inside of shell nacreous.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Nuculoidea : Nuculidae
Listed are literature citing Ennucula tenuis (Montagu, 1808). Reference containing the species Type Description is highlighted.
Allen J A 1954. A comparative study of the British species of Nucula and Nuculana. Journal of the Marine Biological Association of the United Kingdom. 33: 457-472.
Harvey R. & Gage J.D. 1995. Reproduction and recruitment of Nuculoma tenuis (Bivalvia: Nuculoida) from Loch Etive, Scotland. Journal of Molluscan Studies. 61 (4): 409-420.
Montagu G 1808. Testacea Britannica - Supplement Exeter. 183pp + pls 17-30.
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