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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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