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CHELA EFFICIENCY IN DISPLAY AND FEEDING BY HERMIT CRABS (DECAPODA, PAGURIDEA)1) BY D. W. DUNHAM Department of Zoology, University of Toronto, Toronto, Ontario M5S 1A1, Canada Introduction. - The chelipeds of decapod crustaceans are specialized pereiopods, adapted to the forceful yet precise manipulation of the environ- ment. They are used in many different contexts, among which are their nearly universal use in feeding, and their common use in social interactions as display and as fighting organs. Rather different, and sometimes incompatible, specializations attend their use in these two kinds of activity. Measurable ad- vantages are presumably conferred by specialization for one function, and con- sequently disadvantages in a different functional context might be expected. Three common Hawaiian intertidal hermit crabs differ in the appearance of their chelae. Calcinus laevimanus (Randall, 1840) has a large black major chela bearing a bright white patch on its outer surface. The area of white is positively correlated with body size (Dunham, 1978a). Calcinus seurati Forest, 1951, also has an enlarged left chela, but it is not brightly marked. Clibanarius zebra Dana, 1852, has two subequally developed chelae that are not brightly marked. Dunham (1978a, 1978b) has shown that both enlargement and brightness
Crustaceana – Brill
Published: Jan 1, 1981
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