Range extension for three species of South American freshwater crabs (Crustacea: Decapoda: Trichodactylidae) Author Collins, Pablo A. Author Giri, Federico Author Williner, Verónica text Zootaxa 2009 1977 49 54 journal article 10.5281/zenodo.185199 6670a0b9-a2de-46f6-9aa4-3dcc89c8a67b 1175-5326 185199 Dilocarcinus septemdentatus ( Herbst, 1783 ) ( Fig. 1 a) Dilocarcinus septemdentatus — Magalhães 2003 : 206 p., fig. 109. Diagnosis. Carapace: 6 distinctive teeth on each anterolateral border. Abdominal segments III–VI of males fused. Third abdominal segment with slight, smooth margin, without the distinction of a crest among the others abdominal segments. Male pleopod (plp 1) gently curving outwards, distal end extending beyond subterminal spine field, as long as spine field ( Fig. 1 a). Habitat. This species was observed within aquatic vegetation, mainly Eicchornia crassipes , along with other crabs such as D . pagei , Trichodactylus borellianus . Material examined. Nine males and three females, carapace width 22.5 mm (SD 8.69 mm ), FANM N° MFA - ZI 347, Salado River) ( Argentina , Santa Fe, Santo Tomé , 31°39'S 60°45'W ), without collection date, Collins coll.; two males and one female, FANM N° MFA - ZI 402, Colastiné River ( Argentina , Santa Fe, Colastiné Sur, 31°37'S 60°34'W ), 8.9.63 , Martinez; one male, ML-INALI N° B 7, San Javier River ( Argentina , Santa Fe, 29°13’S 59°35’W ), 30.11.0 5, Collins coll.; one male, ML-INALI N° B 8, Setúbal lagoon ( Argentina , Santa Fe, Rincón, 31°35'S 60°39'W ), 1.12.0 5, Collins coll.; one male, ML-INALI N° B 16, Los Amores stream ( Argentina , Santa Fe, 28°51’S 59°29’W ), 29.11.0 5, Collins coll.; two males and two females ML-INALI N° B 21, Parque del Sur lake ( Argentina , Santa Fe, Santa Fe city, 31°39'S 60°42'W ), 28.11.0 6, Collins. Southern locations. Setúbal Lagoon ( 31°35'S 60°39'W ), Colastiné River ( 31°37'S 60°34'W ), Parque del Sur Lake (Santa Fe city) ( 31°39'S 60°42'W ) and Salado River ( 31°39'S 60°45'W ), Paraná River floodplain, Argentina . New distribution. Paraguay , Brazil and Argentina , Salado River as southern limit ( 31°39’S , 60°45’W ) ( Fig. 2 a).