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Some Aspects of the Biology and Functional Morphology of Trapezium (Neotrapezium) sublaevigatum (Lamarck) (Bivalvia: Arcticacea)

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Title: Some Aspects of the Biology and Functional Morphology of Trapezium (Neotrapezium) sublaevigatum (Lamarck) (Bivalvia: Arcticacea)
Authors: Morton, Brian
Issue Date: Apr 1979
Publisher: University of Hawaii Press
Citation: Morton B. 1979. Some aspects of the biology and functional morphology of Trapezium (Neotrapezium) sublaevigatum (Lamarck) (Bivalvia: Arcticacea). Pac Sci 33(2): 177-194.
Abstract: Trapezium sublaevigatum is a widely distributed nestler in rocky
intertidal and sublittoral crevices in Hong Kong. It occurs on a range of beach
types and in waters of different salinity; it is byssally attached and weakly
heteromyarian in form. The quadrangular shell is often distorted. The basic
structure of the shell and the morphology of the organs of the mantle cavity,
visceral mass, and pericardium are broadly similar to a wide range of veneroid
relatives. However, the species is weakly heteromyarian, which results from
the assumption of the byssally attached, epifaunal mode of life. There is thus
a reduction of the anterior face of the shell and an enlargement of the posterior
face with corresponding modifications to the shell (notably hinge teeth and
ligament) and to musculature. Similar, convergent adaptations are seen in
members of the veneroid superfamilies Carditacea, Gaimardiacea, and Dreissenacea,
with which Trapezium can be compared. Further study of other
members of the (isomyarian) Arcticacea might help to establish how the
heteromyarian form arose in Trapezium.
URI/DOI: http://hdl.handle.net/10125/1468
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 33, Number 2, 1979



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