first form male
Sexually functional male crayfish (Cambaridae)); at least one terminal element of first pleopod usually corneouss [Hobbs and Jass, 1988].
The breeding form of male crayfishes in which one of the terminal projections of the first pleopod is corneous, as opposed to the second from male in which this projection is not corneous [Chace and Hobbs, 1969].
The sexually functional male cambarid, most readily recognized by the possession of at least one corneous terminal element on the first pleopod [Hobbs, Hobbs, and Daniel 1977].

Crustacea glossary. . 2011.

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