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TELLINIDAE |
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Tellinota
imbellis
(Hanley, 1844) Description: Shape
elongate, umbo behind midline; postero-dorsal margin slightly concave,
antero-dorsal margin straight to convex. Posterior end slightly flexed,
weak ridge from umbo to posterior end on right valve. Exterior
smooth dorsally, with commaginal ribs ventrally and posteriorly. Interior
with pallial line, anterior and posterior muscle scars well defined;
pallial sinus deep but not reaching anterior muscle scar; peculiar
thickened diagonal ridge through posterior muscle scar, most prominent
on right valve (Fig. 2). Hinge with 2 cardinal teeth in each
valve (1 bifid), and 2 widely spaced lateral teeth in each valve. Ligament
external. Shell colour white internally and externally. Size:
Up
to 41 mm in length. Distribution:
Endemic to Australia: Bohle River mouth, north of Townsville,
southwards to Fleurieu Peninsula, central SA. Habitat: Known
mainly from beach washup. Synonymy:
Ponder (1975) clarified the nomenclature of this species.
Specimens from Aldinga Bay, SA, were named Tellina aldingensis
Tate, 1868. Further synonyms are Tellinota ensiformis Reeve, 1868
and Tellina beryllina Iredale, 1924. Remarks:
The interior diagonal ridge is always present in the right valve
(Figure 2); in some left valves there are two ridges, sometimes weak, in
the corresponding position. Fig.
1:
Chinamans Beach, Middle Harbour, NSW (C.347843) Fig.
2:
Same specimen as Fig. 1, showing ridge in right valve. |
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