Rheotanytarsus curtistylus

Author: (Goetghebuer, 1921)

Exuviae 3.5-4.0mm long (n=5) (134-1.jpg).
Cephalothorax: Frontal apotome smooth. Thoracic horn 520-605µm long (n=9); ThR 13.0-17.8 (n=8); horn with only a few fine setulae on the distal half (134b.jpg). 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 postero-lateral corner of segment VIII bears a simple spur (134c.jpg). Lateral taeniae of segments IV-VIII: 1(0),3,4,4,4(5).
Anal segment: Fringe of anal lobe with 19-27 taeniae (m=22, n=10). On the dorsal surface of the anal lobe is a stiff seta or taenia (often difficult to see) (134c.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 401: Tanytarsini 44 Rheotanytarsus of the Text Key.

Widespread in Europe (not Fennoscandia), circum-Mediterranean.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes