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PSAMMOBIIDAE |
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Heteroglypta
contraria
(Deshayes, 1863) Description:
Shell
moderately inflated. Shape ovate-oblong, umbo slightly anterior
to midline; anterior end rounded, ventral margin straight or slightly
convex, posterior end truncated. Exterior with complicated
sculpture consisting of four sculptural zones: zone 1, on anterior end,
has weak curved radial ribs; zone 2, which is most of anterior half of
shell has weak oblique radials; zone 3, which is posterior half of
shell, has strong radials; zone 4, which is the dorsal posterior region
has very strong radial ribs. Interior smooth apart from incised
muscle scars and pallial sinus extending past midline. Hinge with
2 cardinal teeth in both valves. Ligament attached to small
external nymphs. Shell colour cream or (rarely) pale pink.
Periostracum not seen. Size:
Up to 20 mm in length. Distribution:
Indo-West Pacific. In eastern Australia, as far south as Sydney. Habitat:
Burrows shallowly in clean coarse substrates 6-30 m in depth and
probably deeper. Most museum specimens are from beach washup. Synonymy:
Previously
recognised synonyms are Heteroglypta hedleyi Iredale, 1929, H.
avecta Iredale, 1929, H. pansa Iredale, 1929, H. saltatrix
Iredale, 1929, all of which are based on variations in shape
or deformed shells. Fig. 1: Long Reef, Collaroy, NSW (C.350063) |
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