Simocephalus acutirostratus King, 1853 .

(1) Unidentified waterbody in Itapicuru River Basin, 27.ii.1995, coll. P.S. Young and C.S. Serejo (MNRJ20258). (2) Waterbody near Nova Soure, on the road connecting BR-101 and BR-116, 28.ii.1995, coll. P.S. Young and C.S. Serejo (MNRJ20285) .