Euryrhynchus amazoniensis Tiefenbacher, 1978

Examined material. Municipality of Macapá: Environmental Protection area of Curiaú, Wetland Curralinho (00°07’26.74”N, 51°06’50.18”W), 22.ii.2002, I.M. Vieira and O.A. Alencar, 2 males, 5 females and 10 females with eggs (IEPA 346) ; idem (00°09’23.9”N, 51°02’09.5”W), 25.viii.2002, O.A. Alencar and A.C.R. Araújo, 9 males, 15 females and 2 juveniles (IEPA 375); same collection location (00°09’23.9”N, 51°02’09.5”W), 22.ii.2002, I.M. Vieira and O.A. Alencar, 3 males and 5 females (IEPA379); Wetland Tacacá (00°02’14.7”S, 51°05’47.7”W), idem, 18.vii.2002, O.A. Alencar, D. Filocreão, O.M. Costa, 5 males and 8 females (IEPA 396) ; at the same point as the previous collection, 18.vii.2002, O.A. Alencar, D. Filocreão, O.M. Costa, 3 juveniles (IEPA 397); idem, (00°02’13.11”S, 51°05’39.2”W), 18.vii.2002, O.A. Alencar, D. Filocreão, O.M. Costa, 1 specimen (IEPA 400); idem (00°02’14.0”S, 51°05’46.7”W), 7.i.2004, I.M. Vieira, 1 female (IEPA 502) . Municipality of Ferreira Gomes: Floresta Nacional do Amapá (Amapá National Forest), tributary stream of the Santo Antônio River (01°06’37”N, 51°53’37”W), 6.iii.2005, I.M. Vieira and D.C.C. Vieira, 1 male and 1 female with eggs (IEPA 817) ; idem, (01°06’37”N, 51°53’37”W), 5.iii.2005, I.M. Vieira and D.C.C. Vieira, 1 male and 3 females (IEPA 841); same collection location, 1 male and 3 females (IEPA 849); stream in savanna, near farm Aricari, BR156, km 147, gallery forest (00°55’35”N, 51°15’45”W), 31.i.2006, I.M. Vieira and D.C.C. Vieira, 25 specimens (IEPA 1668) ; same place and date of previous collection (0°55’35”N, 51°15’45”W), 10 females with eggs and 35 specimens (IEPA 1690); 28.i.2006, I.M. Vieira and D.C.C. Vieira, stream with sandy bed, transparent water and gallery forest (0°56’08”N, 51°13’12”W), 1 female with eggs (IEPA 1671) ; stream inside the forest, close to the residence of the Aricari farm (0°57’04”N, 51°14’56”W), 30.i.2006, colls. I.M. Vieira and D.C.C. Vieira, 11 females and 29 specimens (IEPA 1676) .— Municipality of Laranjal do Jari: Sustainable Development Reserve of the Iratapuru River, Stream Baliza (00°18’36”N, 52°26’24”W), 6.v.2005, I.M. Vieira and D.C.C. Vieira, 3 females (IEPA 872) ; same point of previous collection, 11.v.2005, colls. I.M. Vieira and D.C.C. Vieira, 3 females with eggs and 15 specimens (IEPA 1195); idem, 8.v.2005, I.M. Vieira, 5 females with eggs and 36 specimens (IEPA 1266); stream in the interior of the Baliza tributary forest, 10.v.2005, 2 juveniles and 2 females with eggs (IEPA 1269) ; same point of previous collection, 2 juveniles e 16 specimens (IEPA 1317); 3 females with eggs and 7 specimens (IEPA 1318); Jari River (0°51’17”S, 52°32’53”W), stream on the right bank of the Jari River (0°51’17”S, 52°32’ 53”W), 3.xii.2009, I.M. Vieira, 7 specimens (IEPA 1245) ; same point of previous collection, 17.vi.2010, I.M. Vieira and E.F. Araújo, 2 specimens (IEPA 1386); small stream on the left bank of the Jari River (0°50’46”S, 52°32’35”W), 12.ix.2009, I.M. Vieira, 1 specimen (IEPA 1246) ; tributary stream from Jari River (0°50’44”S, 52°32’53”W), 4.ix.2009, I.M. Vieira, 2 specimens (IEPA 1254) ; Stream Riacho Doce (0°50’05”S 52° 32’34”W), 17.vi.2010, I.M. Vieira and E.F. Araújo, 1 female with eggs (IEPA 1393) .— Municipality of Pedra Branca do Amapari: Sustainable Development Reserve of the Iratapuru River, stream on the right margin of the Cupixi River (0°34’20”N, 52°18’36”W), 28.vii.2005, I.M. Vieira and D.C.C. Vieira, 33 specimens (IEPA 900) ; stream on the right margin of the Cupixi River (0°34’11”N, 52°18’28”W), 28.vii.2005, I.M. Vieira and D.C.C. Vieira, 5 specimens (IEPA 903) ; tributary stream of Cupixi River, with sandy bed and in other stretches with mud, unstable and deep (0°34’52”N, 52°19’12”W), 6.viii. 2005, I.M. Vieira, 1 specimen (IEPA 1232) ; stream with sandy bed and in some parts with rocks, very narrow, transparent, water level approximately 40 cm deep, Cupixi River (0°34’40”N, 52°18’04”W), 4.viii.2005, I.M. Vieira, 2 specimens (IEPA 1433) .— Municipality of Oiapoque: National Park of Tumucumaque Mountains, shallow stream forming a swamp during the dry season, tributary of the Anotaié River (3°12’47”N 52°02’22”W), 9.ix.2005, I.M. Vieira and D.C.C. Vieira, 1 male (IEPA 948) ; Anotaié River (3°12’55”N, 52°00’55”W), 12.ix.2005, I.M. Vieira and D.C.C. Vieira, 3 specimens (IEPA 1209) ; stream of the right bank of the Anotaié River (3°13’55”N, 52°01’02”W), 7.ix.2005, I.M. Vieira and D.C.C. Vieira, 2 specimens (IEPA 1213) ; stream of the right bank of the Anotaié River (03°14’50”N, 52°01’04”W), 5.ix.2005, I.M. Vieira and D.C.C. Vieira, 2 specimens (IEPA 1215) ; stream of the right bank of the Anotaié River (3°15’56”N, 52°01’09”W), 8.ix.2005, I.M. Vieira and D.C.C. Vieira, 1 specimen (IEPA 1216) stream of the right bank of the Anotaié River (3°13’55”N, 52°01’02”W), 7.ix.2005, I.M. Vieira and D.C.C. Vieira, 13 specimens (IEPA 1219) .— Municipality of Calçoene: National Park of Tumucumaque Mountains, stream of tributary from Mutum River (1°23’51”N, 51°56’04”W), 6.xi.2005, I.M. Vieira and D.C.C. Vieira, 5 specimens (IEPA 1008) ; stream on the left bank of the Mutum River (1°23’22”N, 51°56’01”W), 4.xi.2005, I.M. Vieira and D.C.C. Vieira, 1 specimens (IEPA 1015) .— Municipality of Pedra Branca do Amapari and Serra do Navio: stream on the right bank of the Anacuí River (1°49’43”N, 52°45’09”W), 6.iii.2006, I.M. Vieira and D.C.C. Vieira, 4 females with eggs and 1 specimen (IEPA 1442) ; tributary stream from Anacuí River (1°50’37”N, 52°45’04”W), 7.iii.2006, I.M. Vieira and D.C.C. Vieira, 4 females and 12 specimens (IEPA 1445) ; tributary stream from Anacuí River (1°50’58”N, 52°45’59”W), 8.iii.2006, I.M. Vieira and D.C.C. Vieira, 3 females and 7 females with eggs (IEPA 1449) ; Rio Araguari, stream at the Capivara waterfall, 20.viii.1992, coll. C. Magalhães (INPA-CRU 001081) ; Serra do Navio, Rod Cachaça, Stream Piçarra, Fazendinha, 22.iii.1991, (INPA-CRU 001214) (Figure 1).

Geographic distribution. Orinoco and Amazon River basins, Venezuela, Colombia, Peru and Brazil (states of Amapá, Amazonas, Pará and Roraima) (García-Dávila & Magalhães 2003; Kensley & Walker 1982; Pachelle & Tavares 2018; Pimentel & Magalhães 2014; Santos et al. 2018; Valencia & Campos 2010; Vieira 2008; Pereira 1991;; López & Pereira 1998).

Distribution in Amapá state. Amapá state basisn of the rivers Curiaú, Iratapuru, Jari, Cupixi, Anotaíé, Mutum, Amapari and Anacuí.

Previous records. Pimentel & Magalhães (2014); Santos et al. (2018); Vieira (2003, 2008).

Ecological notes. Species collected in streams with beds containing a lot of leaf litter and shaded.

Remarks. The specimens analyzed in this study correspond to the descriptions of Melo (2003), Garcia-Dávila & Magalhães (2003); Pachelle & Tavares (2018) and Pimentel & Magalhães (2014).