(Figure 18)
Ambidexter symmetricus Manning & Chace 1971: 3, figs. 1–2.
Material examined. Brazil, Ceará: 1 male, LIMCE-UFC 692, Icapuí, Praia de Requenguela, Banco dos Cajuais, in sea grass beds, coll. C.B. Mendes, 03.vi. 2012 [fcn 12 -054].
Distribution. Western Atlantic: USA (Florida), Caribbean Sea, Brazil (Ceará, Paraíba, Pernambuco, Bahia, Espírito Santo, Rio de Janeiro, São Paulo, Santa Catarina) (Christoffersen 1998; Riul et al. 2008; Almeida & Bezerra 2011; Almeida et al. 2012; present study).
Remarks. Ambidexter symmetricus, the only Atlantic representative of the genus, is widespread in Brazil, but appears to be rather uncommon or at least difficult to collect due to its cryptic, possibly nocturnal habits.