Endotribelos

Trivinho-Strixino, Susana & Pepinelli, Mateus, 2015, A systematic study on Endotribelos Grodhaus (Diptera: Chironomidae) from Brazil including DNA barcoding to link males and females, Zootaxa 3936 (1), pp. 1-41 : 36-39

Endotribelos sp. kleine

( Fig. 21 )

Material examined. 1 pupa with pharate female and head larva skin, Brazil, SP, São Carlos, Leg P. Kleine, 2005 (E3-14 LEIA-UFSCar). 2 prepupa larvae and 2 larvae, same data (E3-15, E3-16, E3-17, E3-18 LEIA-UFSCar).

Diagnostic characters. Larva. Head capsule yellowish, tips of mandibles, mentum and occipital ring blackish. Larvae bright red when alive. Total length near 6 mm. Antenna 5-segmented, basal segment 49 µm long. AR 0.92–1.13; antennal blade longer than antennal flagelum ( Fig. 21 b). Dorsal sclerites of head as in figure 21a, clypeus 37–41 µm long; labral sclerite 2 with a median horseshoe-shaped depression. Pecten epipharyngis formed by toothed plates ( Fig. 21 c). Premandible 107 µm long with two major and one minor teeth; brush well developed ( Fig. 21 d). Mandible 172–192 µm long, with short dorsal tooth, apical and four inner teeth dark brown, 4th inner tooth with sharp apex; seta subdentalis slender, 38–46 µm long ( Fig. 21 e). Mentum 110–121 µm wide, with twelve dark teeth; median teeth near ½ shorter than first laterals; 2nd lateral tooth shorter and fused to first lateral ( Fig. 21 f). Ventral plate 102–106 µm long, with very distinct striations; distance between ventromental plates 54 µm. Procercus short as long as wide, with 8 anal setae. Anal tubules 194 µm, with median constriction. Posterior parapods with brownish claws ( Fig 21 g). Pupa: Tergite I bare, II–VI covered with shagreen, spines near central part of anterior margin stronger, VII and VIII with shagreen near anterior margin. Conjuntives III/IV and IV/V with two large patches of anteriorly directed spines. Hook row continuous with near 22–29 curved spines occupying near 1/ 3 width of segment II. Spur on segment VIII simple. Abdominal setation: segment II–IV with three L setae, V–VI with three taeniate setae, VII and VIII with four taeniate setae.

Comments. This morphotype was previously named as Endotribelos sp. 5 by Trivinho-Strixino (2014). The man differential characteristics of the larvae are: the median horseshoe-shaped depression in labral sclerite 2, the smallest number of teeth f mentum and the shape of 4th inner tooth of mandible.

Figures

FIGURE 21. Endotribelos sp. kleine. a. Dorsal sclerites of head. b. Antenna. c. Pecten epipharyngis. d. Premandible. e. Mandible. f. Mentum and ventromental plate. g. Abdomen posterior.