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EXTERNAL FEATURES OF AN INTERSEX FIDDLER CRAB, UCA PUGILATOR (BOSC, 1802) (DECAPODA, BRACHYURA)

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The external features of an intersex fiddler crab, Uca pugilator, are described. Both male- and female-type sexual characteristics occur on the specimen. This sexually abnormal individual exhibits reduced bilateral asymmetry in its chelipeds. Its abdomen is intermediate between those of a typical male and a typical female. The first and second pairs of pleopods closely resemble those found in a typical male. One female-type pleopod occurs on the right side of the third abdominal segment, while on the fifth segment of the abdomen there exist two female-type pleopods, one on each side. No male genital apertures were found, but two female gonopores occur, one on each side of the midline of the thoracic segment that bears the third pair of walking legs. Possible causes for the sexual aberrations found in this specimen are discussed.

Les caractères externes d’un crabe violoniste, Uca pugilator, intersexué sont décrits. Les caractères sexuels mâles et femelles sont présents à la fois sur le spécimen. Cet individu sexuellement anormal montre une asymétrie bilatérale réduite des chélipèdes. L’abdomen est intermédiaire entre ceux d’un mâle et d’une femelle typiques. Les premières et secondes paires de pléopodes sont celles d’un mâle typique. Un pléopode de type femelle est présent sur le côté droit du troisième segment abdominal, alors que, sur le cinquième segment il en existe deux de type femelle, un sur chaque côté. Aucun orifice génital mâle n’a été observé, mais il y avait deux gonopores femelles, de part et d’autre de la ligne médiane du segment thoracique portant la troisième paire de pattes ambulatoires. Les causes possibles de ces aberrations sexuelles sont discutées.

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