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Partial Protandric Hermaphroditism in the Burrowing Crayfish Virilastacus rucapihuelensis Rudolph and Crandall, 2005 (Decapoda, Parastacidae)

Erich H. Rudolph, Francisco A. Retamal and Andrea W. Martínez
Journal of Crustacean Biology
Vol. 27, No. 2 (May, 2007), pp. 229-241
Published by: on behalf of The Crustacean Society
Stable URL: http://www.jstor.org/stable/4540270
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Partial Protandric Hermaphroditism in the Burrowing Crayfish Virilastacus rucapihuelensis Rudolph and Crandall, 2005 (Decapoda, Parastacidae)
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Abstract

Rudolph and Crandall (2005) found a high percentage (81.3%) of intersex specimens with supernumerary gonopores in the Virilastacus rucapihuelensis type series. To determine the sexual system of this species, the sexual characters of 734 specimens collected from 5 populations of V. rucapihuelensis were examined. Six sexual forms were initially identified, on the basis of the presence or absence of gonopores in the coxae of the third and fifth pair of pereiopods. Subsequently, anatomical and histological analysis of gonads, gonoducts and androgenic gland, made it possible to distinguish three basic sexual types: male, female and intersex specimens; the latter comprise a male phase and two forms in female phase, which would originate from male phase intersexes. Ovigerous females and secondary sexual characters associated with eggs incubation were identified in adult females and in the intersexes in female phase. Evidence gathered suggests that V. rucapihuelensis is a partial protandric hermaphrodite species, with primary males and females. The possible neurohormonal mechanisms responsible for this type of sexual system are discussed, as are the external factors that could have a modifying effect on them. /// En la serie tipo de Virilastacus rucapihuelensis, Rudolph y Crandall (2005) encontraron un alto porcentaje (81.3%) de especimenes intersexo con gonoporos supernumerarios. Para determinar el sistema sexual de esta especie se examinaron los caracteres sexuales de 734 especimenes colectados en 5 poblaciones de V. rucapihuelensis. Sobre la base de la presencia o ausencia de gonoporos en las coxas del tercer y quinto par de pereiópodos, se identificaron inicialmente 6 formas sexuales. Con posterioridad, análisis anatómicos e histológicos de gónadas, gonoductos y glándula androgénica, permitieron distinguir tres tipos sexuales básicos: machos, hembras, e intersexos, estos últimos constan de una fase macho y dos formas en fase hembra, las cuales se originarían a partir de los intersexos en fase macho. Hembras ovígeras y caracteres sexuales secundarios asociados a la incubación de los huevos, se identificaron en las hembras adultas y en los intersexos en fase hembra. Las evidencias reunidas sugieren que V. rucapihuelensis es una especie hermafrodita protándrica parcial, con machos y hembras primarios. Se discuten los posibles mecanismos neurohormonales responsables de este tipo de sistema sexual, como así mismo los factores externos que podrían tener algún efecto modificador sobre ellos.

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