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TELLINIDAE |
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Pristipagia
gemonia
Iredale, 1936 Description:
Shape roughly triangular, umbo behind midline; postero-dorsal
margin convex, antero-dorsal margin straight. Posterior of ventral
margin very weakly flexed; ridge from umbo to posterior margin on both
valves. Exterior whole surface with fine but strong
commarginal riblets; weak, sparse radial threads on midbody on some
specimens. Interior with pallial line, anterior and posterior
muscle scars well defined; pallial sinus deep, extending to anterior
muscle scar. Hinge with 2 cardinal teeth in each valve, 1 weakly
bifid, and 2 widely spaced lateral teeth in each valve. Ligament
external. Shell colour white. Size:
Up to 31 mm in length. Distribution:
Known from Papua New Guinea, southwards through eastern Qld, to
Sydney, NSW. Habitat:
Not reported. Uncommon, but probably under-collected due to
similarity with M. deltoidalis. Comparison:
This is similar to Macomona deltoidalis but lacks the
strong posterior flexure of that species, having only a very week
flexure in the posterior of the ventral margin. It has fine but strong
commarginal sculpture over the whole surface, in contrast to the
irregular sculpture of M. deltoidalis. Fig.
1:
Lindeman Island, Whitsunday Passage, Qld (C.414895) |
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