Leptuca uruguayensis (Nobili, 1901)

(Figure 14C)

Uca uruguayensis Nobili, 1901: 14 .

Material examined. Brazil, São Paulo: 2 ♂, CCDB 278, Ubatuba, Rio Escuro mangrove, coll. F. Mantelatto, 25.viii.1998 ; 1 ♂, CCDB 3512, Ubatuba, Praia Dura, coll. P. Rocha, 29.viii.1992; 2 ♂, CCDB 5275, Ilha Comprida, beach near ferry station to Cananéia, colls. R. Robles et al., 11.iii.2012 .

Distribution. Western Atlantic—Brazil (Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), Uruguay, and Argentina (south to Buenos Aires) (Rathbun 1918; Crane 1975; Bezerra 2012; Masunari et al. 2020).

Remarks. Previous records on the coast of São Paulo include Ilha Piaçaguera in Cubatão (as “Santos: E. Piassaguera”) (Rathbun 1918; Crane 1975), São Sebastião (Luederwaldt 1919a, 1929), Santos (Luederwaldt 1919b; Crane 1975; Bezerra 2012), Cananéia (Gerlach 1958), and Ubatuba (Bezerra 2012). This species presents the most extensive distribution towards south than any other American fiddler crab (Crane 1975; Bezerra 2012). This species and M. mordax, are the only two with southwards distribution where mangroves do not grow (Masunari et al. 2020).