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SEXUAL DIMORPHISM IN FOSSIL AND EXTANT SPECIES OF CALLIANOPSIS DE SAINT LAURENT

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ABSTRACT A large collection of fossil callianassid mud shrimp collected from the Olympic Peninsula, Washington, contains extremely well-preserved material that permits their reassignment from Callianassa clallamensis Withers and Callianassa twinensis Rathbun to the ctenochelid genus Callianopsis de Saint Laurent. In addition, examination of the Recent species Callianopsis goniophthalma Rathbun indicates that this species exhibits sexual dimorphism in the morphology of the major cheliped. The same pattern of dimorphism is also observable in the fossil material. Therefore, the fossil species Callianopsis clallamensis (Withers, 1924), and Callianopsis twinensis (Rathbun, 1926), are synonymized. Specimens originally referrable to Callianopsis clallamensis represent males, and those originally referrable to Callianopsis twinensis represent females. This may be the first observation of sexual dimorphism in the morphology of the major chelipeds within the family Ctenochelidae Manning and Felder, 1991.

10.1163/193724097X00279
/content/journals/10.1163/193724097x00279
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/content/journals/10.1163/193724097x00279
2017-10-24

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