Camelobaetidius billi Thomas & Dominique in Dominique et al. 2000

(Figs. 3, 17–26)

Taxonomy. The specimens collected in Venezuela, only nymphs, have a particular color pattern in the abdominal terga, with segments I and VI–VII brownish, the other segments yellowish as in Fig. 2. The original description did not mention this coloration. However the other characters are similar so we consider these specimens as belonging to Camelobaetidius billi .

This species, described based on nymphs and adults, can be distinguished from the other species of the genus by the following combination of characters, in the adults: 1) abdominal color pattern with spots frequently on segments V–VI; 2) basal segment of forceps short, as long as wide, segment II slightly curved; 3) hind wings with posterior margin convex and with two longitudinal veins. In the nymphs: 1) labrum, dorsally with a subapical row of long setae (Fig. 17 a), anterior margin with bipectinate setae (Fig. 17 b); 2) mandibles with setae between prostheca and mola (Figs. 18–19); 3) lingua longer than superlinguae (Fig. 20); 4) maxillary palpi subequal to galea-lacinia (Fig. 21); 5) segment II of labial palpi rounded medially (Figs. 22 a and b); 6) coxal gills shorter than coxa (Fig. 23); 7) tarsal claws with 30–31 denticles (Fig. 24); 8) posterior margin of abdominal terga with rounded projections (Fig. 25); 9) abdominal gills whitish; 10) paraproct as in Fig. 26; 12) terminal filament subequal in length to abdominal segment X.

Distribution. Brazil, French Guiana, Venezuela.

Material examined. One nymph: Maremán-Parú river, 5º 44' N, 61º 24' W, 1308 m, 23/ 11/ 2005, EG, AMO, CA and MEG cols.; 6 nymphs same locality and same collectors, 28/ 6/ 2007; 2 nymphs, same locality, 19/ 3/ 2006, EG, AMO, and MEG cols. Two nymphs: river close to Paují locality, 4º 29' N, 61º 34' W; 917 m, 17/ 3/ 2006, EG, AMO, and MEG cols. 7 nymphs: Kako-Parú stream, 5º 12' N, 61º 05' W; 1194 m, 24/ 11/ 2005, EG, AMO, CA and MEG cols.; 2 nymphs same locality, 20/ 3/ 2006, EG, AMO, and MEG cols. Three nymphs: Soroape river, 5º 06' N; 61º 34' W, 935 m, 25/ 11/ 2005, EG, AMO, CA and MEG cols. Two nymphs: Kamoirán river, 5º 37' N; 61º 21' W, 1313 m, 20/ 3/ 2006, EG, AMO, and MEG cols. Material housed at IML except 5 nymphs housed at MLBV.