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FIGURE 4. Austinixa aidae (Righi, 1967), SEM of carapace in dorsal view: (A) male topotype of Austinixa bragantina with branchial ridge, Ilha Canela, Bragança, Pará, Brazil (MOUFPE 13411); (B) male topotype of A. aidae without branchial ridge, Foz do Rio Juqueriquerê, Caraguatatuba, São Paulo, Brazil (MZUSP 2233); (C) male of A. bragantina sensu Coelho (2005), with branchial ridge, from Praia de Cumuruxatiba, Prado, Bahia, Brazil (UESC 1124).