Extension of the known distribution of Aegla strinatii Türkay , 1972 and a checklist of decapod crustaceans ( Aeglidae , Palaemonidae and Trichodactylidae ) from the Jacupiranga State Park , South of São Paulo State , Brazil

There are over 120 species of freshwater decapod crustaceans in Brazil. This paper contributes to the knowledge of the species richness and distribution of decapod crustaceans from Jacupiranga State Park, South of São Paulo State. The main objectives were to investigate the geographical distribution of A. strinatii and to generate a checklist of the decapod species collected from the sampling sites. Sixteen sampling sites were investigated during the year of 2007 and four species were collected. The present report represents a new record of A. strinatii from São Paulo State and adds three more localities at Jacupiranga State Park where the occurrence of T. fluviatilis is confirmed.

Palaemonidae is the most abundant family of freshwater prawns in Brazilian continental waters (Sampaio et al., 2009).Among all five genera within this family Macrobrachium Bate, 1868 is the most representative with 17 species reported from Brazilian territory (Pileggi and Mantelatto, 2010;Mossolin et al., 2010).Currently, 10 of these species are recorded from the State of São Paulo (Melo, 2003;Pileggi and Mantelatto, 2010).
The family Trichodactylidae is considered one of the eight exclusively freshwater crab families with 51 species distributed through Mexico, Central and South America (Yeo et al., 2008).The genus Trichodactylus Latreille, 1828 is represented in Brazil by nine species, of which four occur in the state of São Paulo (Magalhães, 2003, Mossolin andMantelatto, 2008).
In this study, we present the results of the faunal survey of the freshwater decapod from Jacupiranga State Park, South of São Paulo State.The main objectives were to investigate the geographical distribution of A. strinatii Türkay, 1972 and to generate a checklist of the decapod species from the streams and rivers investigated.

Materials and Methods
Fieldwork was carried out at the Jacupiranga State Park, São Paulo State, and some adjacent areas during the year of 2007.The Jacupiranga State Park is considered the second largest protected area in the State, with 150,000 acres.The hydrography of the region varies from rivers headwaters, waterfalls, fastflowing mountain streams to lowland rivers (Clauset, 1999).
The coordinates of each sampling site were recorded accurately using a GPS (Global Positioning System).All decapod specimens sampled in this survey were identified according to Melo (2003) and Bond-Buckup and Buckup (1994).Voucher materials from this study were deposited at the Museu de Zoologia (MZUSP), University of São Paulo.
Specimens of A. strinatii were sampled in only two locations: the Ostras stream and the Rolado Cave System.This species has up to now been reported from its type locality (Ostras stream, Tapagem Cave -also known as Devil's Cave) (Türkay, 1972;Rocha and Bueno, 2004) and the River Ribeira de Iguape (Bond-Buckup and Buckup, 1994).Thus, the present report represents a new record of A. strinatii from São Paulo State.The species is troglophile, that is, self-sustained populations are found inside and outside caves, with free transit between both environments (Rocha and Bueno, 2004;Rocha et al., 2010).However, it is important to emphasize that no specimens of A. strinatti were found in the Ostras stream after its resurgence from Tapagem Cave (Table I).Dra.Georgina Bond-Buckup also found no aeglids when sampling in this same locality on 21/oct/2000 (Bond-Buckup, G.: personal communication).Therefore, Tapagem Cave which is the second largest cave in São Paulo State, with 6,237 meters, may represent an obstacle that limits the distribution of A. strinatii downstream Ostras stream.Further investigations and surveys inside Tapagem Cave are necessary to elucidate the extent of occurrence of the species inside the cave and the existence of geographical barriers.Specimens of T. fluviatilis were found in 7 of the 16 sampling sites (Tab.1).The presence of T. fluviatilis at Jacupiranga State Park was already reported by Rocha and Bueno (2004) from Ostras stream and Tapagem Cave.Thus, the present study adds three more localities (Tab. 1) where the occurrence of this species is confirmed.
According to Magalhães (2003) trichodactylid crabs inhabit coastal-plain Rivers at altitudes up to 300 meters.However, specimens of T. fluviatilis have been collected at altitudes up to 960 meters (Rocha and Bueno, 2004;Gomides et al., 2006;Mossolin and Mantelatto, 2008;present study).The ability to complete their life cycle independently of the marine environment (direct development) is an important advantage in the conquest of continental waters and river headwaters located at high altitudes of inland habitats (Rocha and Bueno, 2004).
Macrobrachium olfersii was captured at only 1 site while M. potiuna was collected at 7 sites.The limited distribution of M. olfersii may be related to its type of larval development, in which larvae is dependent of estuarine waters to complete their development (Rocha and Bueno, 2004).On the other hand, M. potiuna, which is considered a continental species, physiologically independent of estuarine water, can colonize greater number of inland environments.