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image of Journal of Crustacean Biology

ABSTRACT Three species-groups of dwarf crawfishes (genus Cambarellus) are accorded subgeneric status: Pandicambarus, containing the most generalized species and restricted to the United States; the monotypic Dirigicambarus, the range of which lies within that of the former; and the nominate subgenus, which is confined to Mexico. Present knowledge of the several character states is such that infrasubgeneric grouping is best attempted by "classical" rather than cladistic techniques. Tertiary geological data indicate that the Cambarellinae were established in the lower Mississippi River basin prior to the Miocene, reinvading the eastern part of the Gulf Coastal Plain in late Miocene or early Pliocene times. Some descriptive terms to be applied to the annulus ventralis are introduced.

Affiliations: 1: 207 North Wacker Lane. Mobile, Alabama 36608.


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