INTRODUCTION Astacidae are generally gonochoric, with defined males and females, but some deviations occur (Noro et al., 2008). The most common is intersexuality, characterized by the presence of both male and female characteristics in a gonochoric or hermaphroditic individual. This can be limited to reproductive anatomy or extend to gonad morphological differentiation during stages of development (Sagi et al., 1996; Vogt, 2002; Noro et al., 2008). In the Parastacidae, cases of intersexuality are found in species from Oceania and South America. In the genus Parastacus , from southern South America, the existence of male and female gonopores in an individual is common (Rudolph & Almeida, 2000). Although intersexuality is common in parastacids and is a strong indication of the occurrence of hermaphroditism, functional hermaphroditism is rare among crayfish and is of the protandric type (Rudolph, 1995). The first case of protandric hermaphroditism in Parastacus was described by Rudolph (1995) in the Chilean species Parastacus nicoleti (Philippi, 1882). Hermaphroditism has also been reported for Parastacus brasiliensis (Von Martens, 1869) and Samastacus spinifrons (Philippi, 1882) by Almeida & Buckup (2000) and Rudolph (1999, 2002), respectively. In the Parastacidae, there has been some investigation of the functional significance of the existence
Crustaceana – Brill
Published: Jan 1, 2014
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