Campylocia anceps (Eaton)

Campylocia anceps; Needham & Murphy, 1924: 27; Gros & Lestage, 1926: 162; Ulmer, 1932: 207; Ulmer, 1942: 101; Spieth, 1943: 1; Traver, 1944: 10; Demoulin, 1952: 13; Kimmins, 1960: 307; Berner & Thew, 1961: 329; Hubbard, 1982: 262; Pereira & Da-Silva, 1990: 2.

Currently there are three species described for the genus, being C. anceps the most widely distributed, and the two others ( C. bocainensis and C. dochmia) only registered from Brazil.

Material. Venezuela, Edo Bolívar, Maremán-Parú, 5º44’49’’N – 61º24’06’’W, 1308 m, 19/III/2006, 1 nymph. Maraupan stream. 05º12’36’’N – 61º05’38’’W, 1194 m, 20/III/2006, 2 nymphs. Pacheco stream, 5º10’29’’N – 61º29’51’’W, 1144 m, 21/III/2006, 4 nymphs. Kaku-Parú stream, 4º54’00’’N – 61º05’25’’W, 913 m, 29/ VI/2007, 1 male imago, 1 female imago. Small stream in the road to the Paují locality, 4º36’45’’N – 61º05’25’’W, 942 m, 17/III/2006, 10 nymphs. Tarota stream, 5º49’15’’N – 61º25’04’’W, 1324 m, 27/VI/2007, 1 male and 1 female imago. Parupa river, 5º40’49’’N – 61º32’39’’W, 1281 m, 28/VI/2007, 7 nymphs. Specimens were deposited at the MLBV (Venezuela) and IBN (Argentina).

Discussion. The specimens studied here correspond to the widely distributed species C. anceps . This species can be characterized in the imagos because the penes lobes are widely divergent along medial line, and do not present median lobes. In the nymphs, the abdominal gills are light colored, with fringes darker, while the antennae is ¾ to subequal in length to the mandibular tusks. Within the material studied, there is some variation in the length of the antennae and the coloration of the gills. Nevertheless, we consider the variation is within the normal limits of the species.

Distribution. Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Surinam, Venezuela and Costa Rica.

Ecology. Imagos and nymphs were collected in both (dry and rainy) seasons. They were found in a diversity of streams of acidic waters (pH = 5), varying from small sandy streams to large rocky rivers.