Fredius fittkaui ( Bott, 1967 )

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 : 6

Fredius fittkaui ( Bott, 1967)

( Figs. 1D , 4 )

Distribution. Venezuela, Guyana, Brazil (Amazonas, Roraima [new record]) ( Magalhães and Rodríguez, 2002; this study).

Material examined. BRAZIL, Roraima: 1 male (69.7:45.6) , 1 female (64.0:41.5), INPA 2440 , mun. Uiramutã [04°35’59”N 060°09’29”W], rio Cambarú, Maturucá indigenous village, 02.iii.2015, S. Silva; 4 immat. males (22.9:14.6–27.6:17.4), INPA 1338 , Yanomami Indigenous Reserve , Rio Uxua-ú , PIN Homoxi, 02°29’51”N 063°43’47”W, 15.xi.2003, V. Py-Daniel and U.C. Barbosa .

Remarks. The G1s of the Roraima specimens ( Fig. 1D ) have all the morphological features as described for the G1 of the upper Negro River specimens by Magalhães and Rodríguez (2002): the well-developed, curved cephalic spine with a rounded tip; and an auxiliary lobe situated laterally and shorter than the cephalic lobe.

Fredius fittkaui has a disjunct distribution, occurring in the southwestern limits of the Guyana Shield in Brazil and Venezuela (with several records in northern tributaties of the upper Negro River), and in Guyana ( Magalhães and Rodríguez, 2002). Unfortunately, the sole record available from Guyana lacks indication of a precise locality ( Magalhães and Rodríguez, 2002). The present two records in the state of Roraima ( Fig. 4 ) indicate that the species may have a continuous distribution along the tributaries of the Negro River and Branco River that drain the southern slopes of the Guyana Shield, probably reaching Guyana through the lowland areas along the Tacutu and upper Rupununi Rivers (see also Magalhães and Rodríguez, 2002: 687, 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.