Abstract
Abstract Calcinus verrilli, a hermit crab endemic to Bermuda, is unusual in that it inhabits both gastropod shells (Cerithium litteratum) and gastropod tubes (Dendropoma irregulare and Dendropoma annulatus; Vermicularia knorrii and Vermicularia spirata). A significant difference was observed between the uropod symmetry of shell dwellers and tube dwellers. Tube dwellers were found to have more symmetrical uropods than shell dwellers. Regardless of shelter, the abdomens of naked individuals coiled to the right, and the left uropod was always longer than the right when their uropods were not perfectly symmetrical, suggesting the C. verrilli may be a descendant of a shell-dwelling ancestor, most likely one that inhabited dextrally coiled shells. Shelter type was manipulated, so that individuals collected in shells were forced to inhabit tubes, while those collected in tubes were forced into shells. Over several molts, uropod symmetry of the forced shelter dwellers did not differ from that of individuals inhab...
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