Rheotanytarsus photophilus

Author: (Goetghebuer, 1921)

Exuviae 3.7-4.4mm long (n=6).
Cephalothorax: Frontal apotome smooth. Thoracic horn 410-480µm long (n=4), with the distal half bearing many setulae (134d.jpg), spinule 6-8µm long (n=3); ThR 12.6-13.7 (n=3). Pearl row absent.
Abdomen: Tergites II-V with anterior paired point patches (on VI some of the points in the anterior shagreen may be enlarged), the shagreen next to the point patches extending at most (on V) to the base of the first dorsal seta, never beyond it (134e.jpg). 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),4,4,5(3,4).
Anal segment: Fringe of anal lobe with 19-29 taeniae (n=6); a dorsal seta absent.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 402: Tanytarsini 45 Rheotanytarsus of the Text Key.

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

Ecological notes
Slow flowing rivers, occasionally lakes and pools.