(Fig. 2I)
Pisidia sayana Leach, 1820: 54.
Material examined. Brazil, São Paulo: 1 ♀ ov, CCDB 5279, Ubatuba, Ilha das Couves, colls. F. Mantelatto et al., 19.x.2012; 1 ♂, 1 ♀ ov, CCDB 2912, Ubatuba, Enseada de Ubatuba, coll. F. Mantelatto, 12.v.2010; 2 ♂, 5 ♀ (4 ♀ ov), CCDB 3621, Ubatuba (35 m), 23°29ʹ49.52ʺS, 044°58ʹ48ʺW, coll. D. Rosa, 14.ix.2011; 1 ♂, 5 ♀ (2 ♀ ov), CCDB 6346, Ubatuba, Enseada de Ubatuba (25–40 m), 23°31ʹ41ʺS, 044°57ʹ18.77ʺW, coll. D. Rosa, 15.viii.2011; 1 ♀ ov, CCDB 5299, Ubatuba, Enseada de Ubatuba, coll. D. Rosa, 18.x.2012; 1 ♀, CCDB 6362, Ubatuba, Praia do Itaguá, colls. F. Mantelatto et al., 23.vii.2009; 2 ♂, 2 ♀ ov, CCDB 5400, Ubatuba (25–40 m), 23°27ʹ30.06ʺS, 045°02ʹ4.86ʺW, coll. F. Zara, 23.iv.2012; 19 ♂, 13 ♀ (7 ♀ ov), CCDB 5402, Ubatuba, 23°31ʹ41ʺS, 044°57ʹ77ʺW, coll. D. Rosa, 17.viii.2011; 1 ♂, 1 ♀, CCDB 5399, Guarujá, 24°03ʹ59.3ʺS, 046°16ʹ56.5ʺW, colls. A. Castilho et al., 24.x.2011; 2 ♀, 1 ♀ ov, CCDB 5403, Cananéia, 25°04ʹ05.2ʺS, 047°55ʹ36.8ʺW, colls. R. Costa et al., 29.viii.2011.
Distribution. Western Atlantic— USA (North Carolina, South Carolina, Georgia, Florida, Mississippi, Louisiana, Texas), Gulf of Mexico, Mexico, Bahamas, Belize, Panama, Cuba, Jamaica, Puerto Rico, Virgin Islands, Antigua, Barbados, Colombia, Venezuela, Guyana, Suriname, French Guiana, Brazil (Amapá, Pará, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe, Bahia, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), Uruguay (Werding 1982; Coelho-Santos & Coelho 1994; Melo 1999; Rodríguez et al. 2005; Coelho et al. 2007; Ferreira & Melo 2016; Mendonça et al. 2019; Spivak et al. 2019).
Remarks. Porcellana sayana is found often as a commensal of at least four hermit crabs (Haig 1956; Meireles & Mantelatto 2008; Fransozo et al. 2011; Brooks & Rittschof 2014) and gastropods (Telford & Daxboeck 1978), or free living on sandy, muddy, and shell bottoms down to a depth of 100 m (Werding 1982; Veloso & Melo 1993). One ovigerous female was found in association with the sponge crab, Dromia erythropus (Edwards in Catesby, 1771) (CCDB 5299). Sequences accession numbers (GenBank): CCDB 3621—16S (MF490163), COI (MF490063) (Mantelatto et al. 2018).