Camelobaetidius billi Thomas & Dominique

Nieto, Carolina, Grillet, Maria-Eugenia, Domínguez, Eduardo, Molineri, Carlos & Guerrero, Edmundo, 2011, The Family Baetidae (Insecta: Ephemeroptera) from Venezuelan Guayana’s Uplands, Zootaxa 2808, pp. 1-17 : 4-8

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.

Figures

FIGURES 2 – 7. Nymphs, dorsal habitus. 2, Baetodes proiectus. 3, Camelobaetidius billi. 4, Camelobaetidius leentvaari. 5, Camelobaetidius mathuriae. 6, Harpagobaetis gulosus. 7, Spiritiops silvudus.

FIGURES 17 – 26. Camelobaetidius billi. Nymph. Mouthparts (Figs. 17 – 22): 17 a, labrum, left d. v., right v. v.; 17 b, labrum, anterior margin; 18, left mandible v. v.; 19, right mandible v. v.; 20, hypopharynx v. v.; 21, maxilla v. v.; 22 a, labium, left v. v., right d. v.; 22 b, labial palp. 23, leg I; 24, tarsal claw I. 25, posterior margin of tergum IV. 26, paraproct.