Macrobrachium potiuna (Müller, 1880) Palaemon potiuna Müller, 1880: 152. Material examined. Brazil, São Paulo: 3 ♂, 3 ♀ (1 ♀ ov), CCDB 2231, Ubatuba, tributary of the Rio Ubatumirim, 15.viii.2007; 1 ♂, CCDB 3143, Ilhabela (Ilha de São Sebastião), Rio Castelhano, colls. F. Mantelatto et al., 21.ii.2011; 6 ♂, 5 ♀ (4 ♀ ov), 26 adults, 13 j, CCDB 3745, Bertioga, Rio João Pereira, colls. F. Carvalho et al., 24.x.2011; 10 ♂, 10 ♀,> 20 adults,> 20 j, CCDB 3747, Praia Grande, Rio Preto, colls. F. Carvalho et al., 23.x.2011; 4 ♂, 2 ♀ ov, CCDB 2131, Eldorado, Rio das Ostras (Caverna do Diabo), coll. E. Mossolin, 01.x.2004; 8 ♂, 2 ♀,> 20 j, CCDB 3664, Pariquera-Açu, Rio da Cachoeira do Encanto, colls. F. Carvalho et al., 10.xi.2011; 4 ♂, 4 ♀ (3 ♀ ov), CCDB 3653, Cananéia, Rio Cachoeira do Pitu, colls. F. Carvalho et al., 09.xi.2011; 7 ♂, 2 ♀, 12 j, CCDB 1092, Cananéia, road Prefeito José Herculano de Oliveira Rosa, colls. F. Mantelatto et al., 29.viii.2011; 6 ♂, 7 ♀ (6 ♀ ov), CCDB 1569, Cananéia, Rio da Cachoeira do Encanto, colls. F. Mantelatto et al., 29.viii.2011. Distribution. Western Atlantic— Brazil (Bahia, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul) (Müller 1892; Moreira 1901; Holthuis 1952a; Melo et al. 1988; Bond-Buckup & Buckup 1989, 1999; Ramos-Porto & Coelho 1998; Pileggi & Mantelatto 2012; Carvalho et al. 2013). Remarks. Previous records from the coast of São Paulo include Ubatuba, Caraguatatuba, Ilhabela (Ilha de São Sebastião), Bertioga, Cubatão, Praia Grande, Peruíbe, Sete Barras, Tapiraí, Eldorado, Iporanga, Pariquera-Açu, Iguape, Ilha Comprida, and Cananéia (Holthuis 1952a; Melo et al. 1988 as M. petronioi; Rocha & Bueno 2004; Pileggi & Mantelatto 2012; Carvalho et al. 2013; Mossolin et al. 2016). Carvalho et al. (2013) detected two distinct lineages in material previously identified as M. potiuna. Therefore, the possibility of cryptic species in the Brazilian drainages should be investigated. Sequences accession number (GenBank): CCDB 2131—16S (HM352438), COI (KM101564) (Pileggi & Mantelatto 2010; Pileggi et al. 2014).

Published as part of Mantelatto, Fernando L. & Al, Et, 2022, Checklist of decapod crustaceans from the coast of the São Paulo state (Brazil) supported by integrative molecular and morphological data: V. Dendrobranchiata and Pleocyemata [Achelata, Astacidea, Axiidea, Caridea (Alpheoidea and Processoidea excluded), Gebiidea, Stenopodidea], pp. 1-74 in Zootaxa 5121 (1) on page 38, DOI: 10.11646/zootaxa.5121.1.1, http://zenodo.org/record/6399728