Rheotanytarsus nigricauda

Author: Fittkau, 1960

Diagnosis (Material in coll. ZSM)
Exuviae 2.9-3.8mm long (n=7).
Cephalothorax: Frontal apotome smooth. Thoracic horn 113-150µm long (n=6), without setulae, but with an occasional sharp point at or near apex; ThR 3.5-5 (n=2). Pearl row absent.
Abdomen: Tergites II-VI with well-developed anterior paired point patches. On tergites II and III the point patches are strongly transverse, rectangular. 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. Segments with lateral setae but no taeniae (occasionally one or two on segment VIII are a little flattened).
Note: The point patches are golden brown to dark brown; the shagreen of tergite II spreads laterally from the point patches, on (III) IV-V (VI) the shagreen spreads across the tergite to nearly cover it; the point patches in front of the hook row are missing but shagreen may form a transverse band in this position.
Anal segment: Anal lobes with a long dorsal seta; each lobe with 8-12 fringe taeniae (n=6).

Species keys out at Page 407: Tanytarsini 49a Rheotanytarsus of the Text Key.

Widespread in Europe (not Scandinavia).
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes