Fredius stenolobus Rodríguez and Suárez, 1994

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 : 10-11

Fredius stenolobus Rodríguez and Suárez, 1994

( Figs. 1G , 4 )

Previous records. Magalhães and Pereira (2007: 124, tab. 4 - listed under Negro River basin); Magalhães et al. (2014: 104, in table, 107).

Material examined. BRAZIL, Roraima: 2 males, 2 females , MIRR 29, mun. Pacaraima [04°28’44”N 61°08’52” W], serra Sorocaima II, São Marcos Indigenous Reserve , igarapé unnamed, 5.xi.2007, I. Macuxi ; 1 male (61.0:43.0), INPA 845 , mun. Alto Alegre, Yanomami Indigenous Reserve, rio Auaris , trib. rio Uraricoera , 04°00’30”N 064°30’13”W, approximately 800 m elev., 3.iii.1994, V. Py-Daniel et al .; 1 male (60.8:40.8), MZUSP 15066 , mun. Amajari, rio Uraricoera, furo Maracá 03°21’04.57”N 061°25’21.26”W, 26.iii.1987, V. Py-Daniel et al .; 4 males (61.1:40.3–85.0:56.4), 4 females (62.0:41.2– 84.5:55.3), INPA 848 , mun. Alto Alegre, Yanomami Indigenous Reserve, rio Uraricoera basin, unnamed stream, Community Palimi-ú , 03°20’03”N 062°58’16”W, 210 m elev., 22.v.1995, V. Py-Daniel and U.C. Barbosa ; 1 male, 1 female, IVIC 1097 , idem ; 3 males (63.3:41.2–78.1:50.6) 3 females (66.5.4:43.7– 74.7:49.4), INPA 849 , mun. Alto Alegre, Yanomami Indigenous Reserve, rio Parima basin, rio Warapekt-ú , PIN Xitei / Xidea , 02°40’18”N 063°49’52”W, 960 m elev., 7.x.1997, leg. U.C. Barbosa ; 2 males (74.8:48.9; 84.3:55.4), 1 female (73.2:44.0), INPA 1252 , mun. Alto Alegre, Yanomami Indigenous Reserve, rio Parima , Community Watatas , 750 m elev., PIN Xitei / Xidea , 02°36’29”N 063°52’18”W, 18.ix.2002, leg. V. Py-Daniel et al .; 2 males (64.3:42.2; 71.4:47.1), INPA 843 , idem locality, 6.xii.1997, G. Vela ; 1 male (broken), 2 females (66.1:43.2; 74.3:49.2), INPA 844 , idem locality, 13.iv.1997, G. Vela ; 1 male (83.0:54.8), 2 females (84.4:55.6; 90.4:59.8), INPA 846 , idem locality, x.1998, V. Py-Daniel et al .; 1 male (74.5:48.5), 1 female (86.4:56.6), INPA 847 ; 1 male, 1 female (57.6:37.6), CNCR 26496 ; 1 male (65.8:42.3), 1 female (75.7:49.8), SMF 31364 ; 1 male (72.4:48.5), 1 female (64.5:43.2), MZUSP 13903 ; mun. Alto Alegre, Yanomami Indigenous Reserve, rio Parima basin, rio Karrucimabi-ú (trib. rio Kunemari ), PIN Xitei / Xidea , 02°34’09”N 063°50’37”W, 1020 m elev., 12.viii.1997, V. Py-Daniel et al .; 1 male (76.5:48.7), INPA 1247 , rio Branco, rocky area downstream from the mouth of rio Mucajaí (02°19’00”N 060°50’00”W), 11.iv.1997, leg. V. Kowalczuk .

Distribution. Venezuela, Brazil (Roraima) ( Rodríguez and Suárez, 1994; Mora-Day and Blanco-Belmonte, 2008; this study).

Remarks. The gonopods of the specimens from Roraima ( Fig. 1G ) show a high morphological similarity with that of the holotype as described in Rodríguez and Suárez (1994) and figured in Rodríguez and Campos (1998: 766, fig. 2A, B) and no remarkable variation was noticed.

With the present records, F. stenolobus exhibits a somewhat wide distribution that encompasses both the Amazonian and Orinocoan slopes of the Serra Paracarima. On the Venezuelan side, the species is distributed in the contiguous hydrographic basins of the Caura River ( Rodríguez and Suárez, 1994; Magalhães and Pereira, 2003) and in the Paragua River ( Mora-Day and Blanco-Belmonte, 2008). On the Brazilian side, it seems to be relatively frequent in the more elevated areas (above 750 m) of the upper Uraricoera River and upper Surumu River basins, but also occurring at lower elevations in the middle course of the Branco River after its confluence with the Mucajaí River (lower than 100 m) ( Fig. 4 ).

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 4. Distribution of the pseudothelphusid species, Fredius fittkaui (Bott, 1967) (circle), F. stenolobus Rodríguez and Suárez, 1994 (triangle), and Kingsleya latifrons (Randall, 1840) (star), in the state of Roraima, Brazil.