Carcinization in the Anomura – fact or fiction? I. Evidence from adult morphology

P. Mclaughlin,R. Lemaitre

Published 1997 in Contributions to Zoology

ABSTRACT

Carcinization, or the process of becoming a crab, has been, and continues to be, a focal point of anomuran evolutionary hypoth­ eses. Traditional examples of carcinization in the Anomura are most celebrated among hermit crabs but certainly are not limit­ ed to this group. Carcinization, if it has occurred, has done so independently in all major anomuran taxa. In this critique, the traditional examples of carcinization in the Anomura are reviewed and more modem variations on the theme assessed. Potential pathways of carcinization are exam­ ined from perspectives of adult morphology in the Paguroidea, Galatheoidea, Hippoidea and Lomoidea, with emphasis on the Paguroidea. Specific attention is given to the theoretical trans­ formation of a hermit crab-like body form into a "king crab"like Iithodid crab. Resulting coercive evidence indicates: (1) that while the evolution of a crab-like body form certainly oc­ curs, the traditional applications, based on inadequate and often inaccurate data, are flawed; and (2) that Iithodid crabs did not arise from a hermit crab predecessor through the process of car­ cinization.

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