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PARTIAL PROTANDRIC HERMAPHRODITISM IN THE BURROWING CRAYFISH PARASTACUS NICOLETI (PHILIPPI, 1882) (DECAPODA: PARASTACIDAE)

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ABSTRACT The question of intersexuality and hermaphroditism was investigated in the burrowing crayfish Parastacus nicoleti (Philippi, 1882) by examination of sexual characters of 473 specimens from Chile. Six sexual forms were initially identified, on the basis of the presence and absence of gonopores in the coxae of the third and fifth pair of pereiopods. Two basic sexual types were found in this species, primary females and protandric hermaphrodites, the latter consisting of 1 male-phase and 3 female-phase forms ― 1 transitional form and 2 female-phase forms-which originate from protandric hermaphrodites in male phase, through 2 slightly different ways. Permanent secondary sexual characters associated with incubation of eggs were identified in adult primary females and in the 2 protandric forms in female phase. Both the gene-dispersal model and the size-advantage model may be used to explain different aspects of this partial protandric hermaphroditism.

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/content/journals/10.1163/193724095x00127
1995-01-01
2016-12-03

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