Euryrhynchus tomasi De Grave, 2007

Euryrhynchus tomasi De Grave, 2007 View in CoL

Examined material. Municipality of Calçoene: tributary stream on the right bank of the Amapá Grande River, downstream of Cachoeira Grande , Calafate ( 2°9’30.98”N, 50°55’19.83”W), 22.ix.2021, colls. I.M. Vieira and A.G.S. de Almeida and D.P. de Almeida, 14 males and 5 females ( IEPA 2099 View Materials ) GoogleMaps .

Geographic distribution. French Guiana, Brazil ( Amapá state, northwest and north of the city of Amapá, Vilarejo and Balneário Cachoeira Grande, Amapá Grande River and Cachoeira Grande, according to De Grave (2007) and Pachelle & Tavares (2018) ( Figure 1 View FIGURE 1 ).

Distribution in Amapá state. Affluent stream of the Amapá Grande River, downstream and upstream of Cachoeira Grande.

Previous records. Pachelle & Tavares (2018)

Ecological notes. Collected in shallow and shaded stream, with plenty of leaf litter, dry season, pH (6.08), water temperature (25.5°C), dissolved oxygen (60.7%) and conductivity (10 μS/cm).

Remarks. Euryrhynchus tomasi is distinguished from E. burchelli by presenting the pereiopod carpus 2 unarmed and the grouper with a spine on each side of the distoventral region; while females have an internal appendage from the third to the fifth pleopod (Pachelle & Tavares 2018).