(Fig. 9)
Ambidexter symmetricus Manning & Chace, 1971: 3, figs. 1–2.
Material examined. 1 ni, 18.VIII. 2007, Maraú, Tanque Island, T 2, MZUESC 1106; 1 m, 17.VIII. 2007, Maraú, Tanque Island, T 3, MZUESC 1110.
Distribution. Western Atlantic—Florida to Brazil (Pernambuco to Santa Catarina) (Christoffersen 1998).
Ecological notes. The material examined was collected at a depth of 0.8–1 m and salinity 31–32 psu. The type of bottom was not recorded.
Previous records. None.
Remarks. An identification key to the Brazilian Processidae was provided by Almeida & Bezerra (2011). Ambidexter Manning & Chace, 1971 is readily recognized by the chelate first pereiopods (vs. only one, usually the right, of the first pereiopods chelate in Processa Leach, 1815 and Nikoides Paulson, 1875) (Manning & Chace 1971).