(Fig. 2G)
Porcellana armata Gibbes, 1850: 190.
Material examined. Brazil, São Paulo: 3 ♂, 1 ♀, CCDB 4302, Ubatuba, Praia do Itaguá, colls. F. Mantelatto et al., 22.ii.2011; 1 ♂, 3 ♀ ov, CCDB 3279, Ubatuba, Praia do Itaguá, coll. R. Robles, 04.iv.2011; 1 ♂, CCDB 6377, Ubatuba, Enseada de Ubatuba, Praia do Itaguá, colls. M. Miyazaki et al., 30.xi.2014; 2 ♂, CCDB 4209, Ubatuba, Praia Grande, coll. F. Zara, 22.iv.2012; 1 ♀ ov, CCDB 4223, Ubatuba, Praia Grande, colls. R. Costa et al., 22.viii.2012; 2 ♂, 1 ♀ ov, CCDB 3275, Ubatuba, Saco do Codó, Praia do Lamberto, colls. F. Mantelatto et al., 03.iv.2011; 6 ♂, 8 ♀ (6 ♀ ov), CCDB 584, São Sebastião, Araçá, colls. F. Mantelatto et al., 16.xi.2001; 4 ♂, 6 ♀ ov, CCDB 1611, Guarujá, Praia do Guaiúba, colls. F. Carvalho et al., 22.x.2011; 6 ♂, 4 ♀ (1 ♀ ov), CCDB 3594, Guarujá, 23°54ʹ49.8ʺS, 046°11ʹ58.6ʺW, colls. N. Rossi et al., 24.x.2011; 9 ♂, 11 ♀ (10 ♀ ov), CCDB 1612, São Vicente, Praia Itararé, colls. T. Rocha et al., 23.x.2011; 8 ♂, 6 ♀, CCDB 5405, São Vicente, Praia dos Milionários, colls. F. Zara et al., 23.x.2011; 1 ♂, CCDB 3263, Cananéia, 25°01ʹ22ʺS, 047°55ʹ48ʺW, colls. F. Mantelatto et al., 16.iv.2011; 7 ♂, 2 ♀ ov, CCDB 888, Cananéia, 25°01ʹ22ʺS, 047°55ʹ48ʺW, colls. F. Mantelatto et al., 28.viii.2011; 1 ♂, CCDB 5066, Cananéia, colls. F. Mantelatto et al., 21.vi.2012; 1 ♂, 2 ♀ ov, CCDB 3191, Cananéia, Ilha Comprida, Praia da Trincheira, colls. F. Mantelatto et al., 17.iv.2011; 3 ♂, 1 ♀, CCDB 969, Ilha Comprida, 25°01ʹ23.7ʺS, 047°55ʹ0.75ʺW, coll. F. Mantelatto, 30.viii.2011.
Distribution. Western Atlantic— Bermuda, USA (Connecticut, North Carolina, Georgia, Florida, Louisiana, Texas), Gulf of Mexico, Mexico, Bahamas, Belize, Costa Rica, Panama, Cuba, Jamaica, Puerto Rico, Virgin Islands, Colombia, Venezuela, Brazil (Fernando de Noronha, Pará, Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe, Bahia, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina); Eastern Atlantic— Ascension Island, Gibraltar, Senegal, Angola; Eastern Pacific—from Gulf of California to Ecuador (Galapagos Islands), Peru (Haig 1956, 1960; Gore & Abele 1976; Ramos-Porto et al. 1978; Werding 1982; Coelho-Santos & Coelho 1994; Melo 1999; Werding et al. 2003; Coelho et al. 2007; Mantelatto et al. 2011; Ferreira & Melo 2016; Hiller & Lessios 2017).
Remarks. Petrolisthes armatus is an euryhaline species that inhabits mangrove regions, living on root branches of Rhizophora sp. and Avicenia sp. and in small lagoons. It is also found in the intertidal region, under rocks, on corals, sponges, reefs built by Phragmatopoma caudata Krøyer in Mörch, 1863, mussel beds and oysters down to 60 m depth (Werding 1977, 1982; Veloso & Melo 1993; Micheletti-Flores & Negreiros-Fransozo 1999; Hollebone & Hay 2007, 2008; Macedo et al. 2012). Recent studies have reported that P. armatus is not a species complex but a single species with large distribution and high variability (Mantelatto et al. 2011; Hiller & Lessios 2017). In addition, it has been cited as an invasive species, expanding its distribution by in advertent transportation alongside oysters and seed clams for use in the aquaculture industry (Knott et al. 2000; Wassick et al. 2017; Mack et al. 2019). Sequences accession numbers (GenBank): CCDB 1747—16S (HM352475), CCDB 5185—COI (MF490061) (Mantelatto et al. 2011, 2018).