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FAMILY |
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Abranda
modestina
(Tate, 1891) Description:
Shell translucent. Shape elongate-ovate, umbo behind
midline. Posterior end slightly bent; ridge present from umbo to
posterior end on right valve but weak. Exterior nearly smooth,
with weak irregular commarginal ribs. Interior with muscle scars
and pallial line well defined; pallial sinus deep. Hinge with 2
cardinal teeth, 1 bifid, and widely spaced lateral teeth in each valve. Ligament
external. Shell colour white internally and externally. Periostracum
thin, brown, restricted to ventral margin. Size:
Up to 15 mm in length, but usually smaller. Distribution:
Specimens in the Australian Museum collection are from Port
Stephens southwards to Twofold Bay, NSW. Habitat:
Known most commonly from beach washup but also dredged down to
100 m depth. Comparison:
Compared to Abranda hypelliptica this species is larger,
more elongate and white in colour. Synonymy:
The synonymy of this species was detailed by Ponder (1975). He
said the species has been considerably confused in the literature, which
continues to be the case. He gave synonyms of Abranda rex Iredale,
1924 and Syndesmya elliptica E.A. Smith, 1884. Fig.
1:
Jervis Bay, NSW (C.11643) |
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