A new distribution record for Zilchiopsis oronensis (Pretzmann, 1968) (Decapoda, Trichodactylidae) in Argentina.

COLLINS, P.; WILLINER, V.; GIRI, F

CRUSTACEANA

Springer

Año: 2002 vol. 75 p. 931 - 934

0011-216X

In South America, the freshwater crab genus Zilchiopsis is known to be represented by two species, Z. collastinensis (Pretzmann, 1968) (restricted to Argentina) and Z. oronensis (Pretzmann, 1968) (northern Paraguay, Bolivia, and Brazil) (Magalhaes & Türkay, 1996; Morrone & Lopretto, 2001). Recent sampling and the detailed examination of a badly classified crustacean collection from the "Florentino Ameghino" Natural Museum of Santa Fe city, Ar­gentina has revealed or confirmed the presence of Z. oronensis in the middle Paraná river floodplain. Its distribution has previously been confused by Sorensen, giving wrong references (cf. Magalhaes & Türkay, 1996). The holotype corresponds to material from a more austral locality than Magalhaes & Türkay (1996) noted, they indicated that, in the Amazon region, the species´ southern-most limit is in Río Apa (22°06´S 57°56´W). However, there are ambiguous data corresponding to Río de Oro, Chaco Argentina (27°5 S8°33´W) but the geographic coordinates given do not correspond to that locality (27°S 56°30’W) (Rodriguez, 1992). The aim of this work is to record the occurrence of Z. oronensis and to extend its known southward range to the Paraná river f1oodplains.