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image of Journal of Crustacean Biology

ABSTRACT The morphology and gonad history of a bilaterally gynandromorphic fresh-water crab (Potamon fluviatile Herbst) is describcd. The abdomen and gonopods exhibit male characteristics on the left side of the body, female ones on the right, with the exception of a partial masculinization of the first right pleopod. The right side has a normal female gonopore, the left one a penis. Internally, testes and vas deferens are present on both sides, though the right vas deferens is incomplete and does not communicate with the outside. On the right, a seminal receptacle full of sperm indicates that the animal has mated as a female. An isolated portion of gonad, also showing testicular activity, is annexed to the seminal receptacle. Mature sperms are visible throughout the gonad and vas deferens. No ovarian tissue was detected in the entire reproductive apparatus of this specimen. The haploid chromosome number does not differ significantly between the male and female sides and averages 68 ± 1.3. The role of the androgenic hormone on sex differentiation of Brachyura is discussed.

Affiliations: 1: Institute of Marine Sciences, University of North Carolina, Morehead City, North Carolina 28557.


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