Sylviocarcinus pictus ( Milne-Edwards, 1853 )

Collins, Pablo A., Giri, Federico & Williner, Verónica, 2009, Range extension for three species of South American freshwater crabs (Crustacea: Decapoda: Trichodactylidae), Zootaxa 1977, pp. 49-54 : 51

Sylviocarcinus pictus ( Milne-Edwards, 1853)

( Fig. 1 b)

Sylviocarcinus pictus ( Milne-Edwards, 1853) — Magalhães & Türkay 1996b: 244 p., fig. 135 (complete synonymy).

Diagnosis. Carapace: 4 distinctive teeth on each anterolateral border. Abdominal segments III–VI of male: fused. The male plp 1 bends following a regular curve to the right, subdistal lobe with subterminal spine field strongly developed, basal lobe: insignificant ( Fig. 1 b).

Habitat. This species was observed in caves and under tree trunks. In other caves, the crab Zilchiopsis collastinensis was mainly found.

Material examined. Seven males, one female and eight juveniles; carapace width: 43.5 mm (SD 6.68) two males, one female and four juveniles, FANM N° MFA - ZI - N° 271, Santa Fe stream ( Argentina, Santa Fe, 31°38'S 60°39'W), 22.3.65, non-specific collector; two males and four juveniles, ML-INALI N° B - 9, Coronda River ( Argentina, Santa Fe, Sauce Viejo, 31°48'S 60°46'W), 13.12.0 0, Collins coll.; one male, ML- INALI N° B 10, Setúbal Lagoon ( Argentina, Santa Fe, Colastiné Sur, 31°39'S 60°45'W), 20.12.0 0, Collins coll.; one male ML-INALI N° B 11, Salado River ( Argentina, Santa Fe 31°39'S 60°45'W), 12.2.0 3, Regner coll.; one male, ML-INALI N° B 15, El Limpio stream ( Argentina, Santa Fe, Paranacito, 28°5’S 59°09’W), 29.11.0 5, Collins coll.

Southern locations. Setúbal lagoon (31°35'S 60°39'W), Coronda River (31°48'S 60°46'W) and Salado River (31°39'S 60°45'W), Paraná River floodplain, Argentina.

New distribution. Peru, Guyana, French Guyana, Paraguay, Bolivia, Brazil and Argentina, Coronda River south limits (31°48’S 60°46’W) ( Fig. 2 b).

Figures

FIGURE 1. Right male pleopod 1, mesial aspect of A) Dilocarcinus septemdentatus, together with ventral view of the carapace with the abdominal segments (A’), B) Sylviocarcinus pictus, and C) S. australis, all from specimens from the Paraná River, Argentina. Scale bar equals 1.0 mm.

FIGURE 2. Distribution maps of Dilocarcinus septemdentatus, Sylviocarcinus pictus and S. australis according to Magalhães and Türkay (1996 a; b); Magalhães (1998; 1999 a; b; 2000); Morrone and Lopretto (2001). Dots, locations; drawn lines, distribution known to date; brown lines, newly reported distribution areas.