Medium-sized larvae, up to 8 mm long. Head brown, posterior margin dark brown. Head capsule longish, oval; cephalic index 0.6. Dorsally S5 anterior to DP, S7 directly anterior to S8; DP mesal to S8 Ventrally S10 lateral or posteromesial to S9 + VP, S9 and S10 clustered (position of S10 lateral to S9 characteristic), SSm posteromesial.
About 2x as long as mandible. Antennal ratio 3.8. Basal segment 7.5x as long as basal width, with ring organ at base of distal 1/3; segment 2 6x as long as wide; segment 3 only a little longer than last segment. 1 Style clubbed apically, extending to middle of last segment. Peg sensilla very small. Blade scarcely longer than flagellum; basal ring 1/5 as high as length of blade. Accessory blade extending to last antennal segment.
Slender, gradually curved, strongly broadened in basal 1/2. Apical tooth blackish, 2x as long as basal width, 1/3 as long as mandible. Inner tooth bluntly rounded, not extending over seta subdentalis; mola expanded as large, rounded tooth; seta subdentalis slender. Ventrolateral setae roughly equidistant from one another on outer margin of basal 1/2 of mandible, with ring organ proximal thereto; seta 1 small, hardly discernible peg, seta 2 simple, 3 divided.
Basal segment of palp about 3.5x as long as wide, with ring organ at base of apical 1/3; b sensilla in 2 sections, basal part 2x as long as apical part.
Without fringe of swim-setae. Anal tubules conical. Subbasal seta of posterior parapod simple. Procercus almost 3x as long as wide, with 7 apical setae. Claws of posterior parapod all light brown, simple; larger claws with fine spinules on inner and/or outer margin.
Telopelopia is perhaps the most distinctive of the Thienemannimyia-group of genera. It differs from all of these in the large basal tooth of the mandible and the broad, uniformly distributed granulation of the pseudoradula, which is not arranged in longitudinal rows.
Larvae of Telopelopia live in both lotic and lentic habitats. They are eurythermic, preferring the potamon of larger rivers.
The distribution of Telopelopia is Holarctic. One species T. okoboji, is known from Manitoba and Minnesota south to New Mexico. In the Palaearctic the one species T. fascigera is reported from the Mediterranean region, the Balkans and (as T. maroccana, a synonym) from North Africa. There are no records of Telopelopia outside the Holarctic region