Rheotanytarsus pentapoda

Author: (Kieffer, 1909)

Exuviae 3.2-3.9mm long (m=3.6mm, n=12).
Cephalothorax: Frontal apotome smooth. Thoracic horn 300-470µm long (m=393µm, n=14), with setulae (about 8µm long) distally (134h.jpg); ThR 10.8-23.5 (n=9). Pearl row absent.
Abdomen: Tergites II-VI with well-developed anterior paired point patches. On tergites II and III the point patches are circular, longitudinally oval or, at most, a little broader than long, transversely broad oval. The point patches are golden to golden brown; the shagreen on tergites II-VI is restricted to lateral extensions of the anterior point patches (134i.jpg) and on V and VI it spreads posteriorly to about half the tergite length; the points in the posterior patches in front of the hook row on tergite II are strong and numerous. The postero-lateral corner of segment VIII bears a simple, cleft or toothed spur, or three spurs, of which the outermost is the strongest and bent as a hook. Lateral taeniae of segments IV-VIII: 1,3,4,4,4.
Anal segment: Fringe of anal lobe with 16-21 taeniae (m=18.4, n=12).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 405: Tanytarsini 48 Rheotanytarsus of the Text Key.

Widespread in Europe, north Africa.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Streams and rivers; lakes in the north.