Fredius beccarii ( Coifmann, 1939 )

Magalhães, Francinéia Zanetti Patrícia Macedo de Castro Célio, 2018, Freshwater crabs (Decapoda: Brachyura: Pseudothelphusidae, Trichodactylidae) from the state of Roraima, Brazil: species composition, distribution and new records, Nauplius (e 2018011) 26, pp. 1-19 : 3-4

Fredius beccarii ( Coifmann, 1939)

( Figs. 1A , 3 )

Material examined. BRAZIL, Roraima: 1 male (40.2:26.4) , MIRR 95 , mun. Amajarí, Tepequém, RR 203 road, igarapé Pau Baru , 03°41’N 061°41’W, 24.ii.2011, F. Zanetti, A.A. Otaviano, A.S. Sales and D. Teixieira ; 1 male (35.7:23.8) 1 female (33.2:22.4), INPA 1895 , mun. Amajarí, vila Bom Jesus, vicinal II, Trairão , igarapé Coimbra , 03°37’N 061°49’W, 24.ii.2011, F. Zanetti, A.A. Otaviano, A.S. Sales and D. Teixeira, F.C. Zanetti, A.A. Otaviano, A.S. Sales and Neiva ; 3 males (29.2:19.9–43.5:28.9), 7 females (27.7:19.4–88.1:57.4), INPA 2435 , mun. Amajarí, vila Bom Jesus, vicinal II, Trairão , igarapé do Coimbra , 03°37’N 061°49’W, 18.iv.2015, F. Zanetti and M.A.L. Santos ; 2 males (21.2:14.9; 32.9:22.5) 1 young, MIRR 97 , mun. Amajarí, vila Bom Jesus, vicinal II, Trairão , igarapé Coimbra , 03°37’N 061°49’W, 31.x.2009, F. Zanetti, P.M. Castro and D.A. Lima .

Distribution. Venezuela, Guyana, and Brazil [new record] (Roraima) ( Rodriguez, 1982; this study).

Remarks. The G1s of our specimens ( Fig. 1A ) are morphological very similar to that of a specimen from the Rupununi River, in Guyana, figured by Rodriguez (1982: 135, fig. 129).

Until now, the species was known from eastern Venezuela and Guyana in the Essequibo River and Demerara River basins ( Rodriguez, 1982). Its occurrence in the Uraricoera River basin indicates that the species can be found in both the northern and southern slopes of the Guyana Shield ( Fig. 3 ).

Figures

Figure 1. Male first gonopod, left side, distal part, of the pseudothelphusid crabs from Roraima. A, Fredius beccarii (Coifmann, 1939), mesio-caudalview,INPA 1895; B,Fredius estevisi(Rodríguez, 1966), mesio-caudal view,INPA 839; C, F.estevisi, latero-caudal view, INPA 839; D, Fredius fittkaui (Bott, 1967), mesial view, INPA 1338; E, Fredius platyacanthus Rodriguez and Pereira, 1992, mesial view, INPA 840; F, F. platyacanthus, lateral view, INPA 840; G, Fredius stenolobus Rodríguez and Suárez, 1994, mesio-caudal view, INPA 1252; H, Kingsleya latifrons (Randall, 1840), mesio-caudal view, INPA 1248.

Figure 3. Distribution of the pseudothelphusid species, Fredius beccarii (Coifmann, 1939) (triangle), F.estevisi (Rodríguez, 1966) (star), and F. platyacanthus Rodriguez and Pereira, 1992 (circle), in the state of Roraima, Brazil.