Acetes marinus Omori, 1975

Examined material. Municipality of Amapá: estuary of Sucuriju River (01°40’27.36”N, 49°55’42.32”W), 28.iv.2004, cols. I.M. Vieira and C.S. Gama, 1 female (IEPA 832); Mouth of Sucuriju River (01°40’09.73”N, 49°55’04.95”W), 23.vii.2002, col. I.M. Vieira, 1 specimens (IEPA 1738)— Municipality of Mazagão: Lower Cajari River (00°51’20.9”S, 51°43’41”W), 26.v.2014, cols. A.G. Santiago, 2 specimens (IEPA 1620). Municipality of Oiapoque: Mouth of Oiapoque River (04°04’25.71”N, 51°38’35.31”W), 22.viii.2003, cols. I.M. Vieira,A.G. Santiago and E.O.Galeno, 1 specimens (IEPA 1621) (Figure 2) .

Geographic distribution. Guyana, Suriname French Guyana and Brazil (state Amapá, Pará and Tocantins) (Melo 2003; Omori 1975; D’incao 1998; D’Incao & Martins 2000; Pimentel & Magalhães 2014).

Distribution in Amapá state. In the estuary of the rivers Sucuriju and Oiapoque and lower Cajari River.

Previous records. Melo (2003); Pimentel & Magalhães (2014).

Ecological notes. This species inhabits slightly brackish waters (Omori 1975).

Remarks. In general, A. marinus resembles A. paraguayensis, but differs from it by the absence of a large tooth on the thigh of the third pereiopod in females and males. (Omori 1975).