Pisidia brasiliensis Haig in Rodrigues da Costa, 1968

Pisidia brasiliensis Haig in Rodrigues da Costa, 1968: 406.

Material examined. Brazil, São Paulo: 1 ♂, CCDB 1094, Ubatuba, Praia do Perequê-Açu, colls. F. Mantelatto et al., 1.i.2003 ; 2 ♂, 1 ♀ ov, CCDB 392, Ubatuba, Enseada de Ubatuba, colls. F. Mantelatto et al., 1.x.2007 ; 2 ♂, 5 ♀ (4 ♀ ov), CCDB 6375, Ubatuba, Enseada de Ubatuba, Praia do Itaguá, colls. T. Magalhães et al., 30.xi.2014 ; 1 ♂, CCDB 5618, Ubatuba, Enseada de Ubatuba, Praia do Itaguá, colls. T. Magalhães et al., 30.xi.2014 ; 1 ♂, CCDB 633, Ubatuba, Praia do Lamberto, colls. F. Mantelatto et al., 1.v.2000 ; 1 ♂, CCDB 6511, Cananéia, colls. R. Costa et al., 12.viii.2019 .

Distribution. Western Atlantic— Colombia, Venezuela, Brazil (Pará, Ceará, Rio Grande do Norte, Paraíba, Alagoas, Rio de Janeiro, São Paulo, Santa Catarina) (Coelho 1963; Coelho & Ramos-Porto 1994; Coelho-Santos & Coelho 1994; Coelho et al. 2007; Machado et al. 2012; Ferreira & Melo 2016).

Remarks. Pisidia brasiliensis occurs in shallow waters, on sandy and rocky substrates (Veloso & Melo 1993; Fransozo et al. 2011). It is also found associated with the bryozoan S. errata, in the infralittoral zone, on reefs of P. caudata, but at lower densities (Micheletti-Flores & Negreiros-Fransozo 1999) and with the mussel farming ropes of Perna perna (Linnaeus, 1758) (Macedo et al. 2012) . This species is frequently misidentified as Porcellana platycheles (Pennant, 1777) . The latter, despite having been recorded to São Paulo by Melo (1993), was later excluded from the list of species occurring in Brazil due to misidentifications (Veloso & Melo 1993; Ferreira & Melo 2016). Sequences accession numbers (GenBank): CCDB 5618—16S (MT812691), COI (MT785556).