Megalobrachium roseum (Rathbun, 1900)

(Fig. 2B)

Porcellana rosea Rathbun, 1900: 148, pl. 8, fig. 3

Material examined. Brazil, São Paulo: 1 ♂, 2 ♀ (1♀ ov), CCDB 5278, Ubatuba, colls. F. Mantelatto et al., 16.x.2012; 1 ♀ ov, CCDB 6416, Ubatuba, Enseada de Ubatuba, Praia do Itaguá, colls. T. Magalhães et al., 30.xi.2014 ; 1 ♂, CCDB 2854, Ubatuba, Praia do Itaguá, colls. F. Mantelatto et al., 03.vii.2008 ; 7 ♂, 11 ♀ (7 ♀ ov), CCDB 5401, Ubatuba, Praia do Itaguá, colls. F. Mantelatto et al., 22.ii.2011 ; 9 ♂, 10 ♀ (3 ♀ ov), CCDB 5297, Ubatuba, Praia do Itaguá, colls. M. Negri et al., 11.ix.2013 ; 1 ♂, CCDB 1138, Ubatuba, Praia do Lamberto, colls. F. Mantelatto et al., v.2002 ; 1 ♀, CCDB 2811, Ubatuba, Ilha Anchieta, Praia do Leste, colls. F. Mantelatto & R. Biagi, v.2000 ; 4 ♂, 3 ♀, CCDB 2017, Ilhabela, Praia do Engenho d’Água, colls. F. Mantelatto et al., vii.2006 ; 8 ♂, 5 ♀ (3 ♀ ov), CCDB 2019, Ilhabela, Praia do Engenho d’Água, colls. F. Mantelatto et al., v.2007 ; 3 ♂, 3 ♀, CCDB 2108, São Sebastião, Praia do Segredo, colls. F. Mantelatto et al., xi.2007 ; 1 ♂, 1 ♀, CCDB 3107, São Sebastião, Praia do Segredo, colls. F. Mantelatto et al., 13.xi.2007 ; 1 ♀ ov, CCDB 6710, Cananéia, Ilha da Figueira, colls. F. Zara et al., 26.xi.2020 .

Distribution. Western Atlantic— Panama, Martinique, Colombia, Venezuela, Suriname, Brazil (Maranhão, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Bahia, Espírito Santo, Rio de Janeiro, São Paulo) (Coelho-Santos & Coelho 1994; Werding et al. 2003; Rodríguez et al. 2005; Coelho et al. 2007; Ferreira & Melo 2016).

Remarks. This species inhabits the intertidal region down to 50 m, on coral reefs and under rocks; found living associated with bryozoans, polychaetes and sponges (Veloso & Melo 1993; Melo 1999; Micheletti-Flores & Negreiros-Fransozo 1999). Most of the specimens in São Paulo were collected with colonies of bryozoan S. errata . One specimen (CCDB 1138) was found associated to a crinoid (Echinodermata). Sequences accession numbers (GenBank): CCDB 2854—16S (HM352468), CCDB 5297—COI (MF490052) (Mantelatto et al. 2011, 2018).