Paratrichocladius rufiventris

Author: (Meigen, 1830)

Exuviae 3.1-4.2mm long (m=3.7mm, n=18) (080-2.jpg).
Cephalothorax: Frontal setae absent. Thoracic horn 130-215µm long (m=164µm, n=16), toothed or nearly smooth, generally somewhat club-shaped with the apical half expanded (080f.jpg); ThR 4.5-10.0 (m=7.7, n=16). Dorsocentral setae without great differences in breadth.
Abdomen: Length hook row II 0.36-0.46x width tergite II (m=0.40, n=8); hooks 38-84 (n=6). Tergite II with a posterior transverse row or narrow band of points immediately in front of the hook row. Tergites III-V with the median transverse point band medially arched (convex anteriorly, concave posteriorly); the median part of this transverse band on tergite III is situated in the second quarter of the tergite leaving the third quarter between it and the posterior band free of points; the median patch of tergite VI is often not concave posteriorly (080g.jpg). Pedes spurii B II and III present. Five lateral setae on segment VIII, the fourth and fifth more or less equal in size (080h.jpg).
Anal segment: Anal lobe ratio 1.3-1.8 (n=9). Anal lobes without fringe. Length of anal macrosetae 0.52-0.76x length of the anal lobe (m=0.66, n=10) (080h.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 878: Orthocladiinae 289 Paratrichocladius of the Text Key.

Holarctic species: widespread in Europe, circum-Mediterranean, Canary Islands.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Standing and flowing water.
In small and large streams, littoral of lakes. Larvae in periphyton growing on stones, common in polluted waters also (Rossaro, 1990a).