Rheomus yahiae

Author: Laville and Reiss, 1988

Diagnosis (n=1, material in coll. ZSM; in part after Laville and Reiss, 1988a - in italics)
Exuviae 2.7mm long (092-1.jpg).
Cephalothorax: Frontal setae short and fine, on small, conical, cephalic tubercles (092b.jpg). Frontal warts absent. Thoracic horn with 5 medially bifurcating branches, 0.7-0.9mm long. 2 Precorneal, 2 antepronotal and 4 dorsocentral setae.
Abdomen: Tergite I bare. Hook row II absent. Tergite armament restricted to large points set on the apices of paired posterior transverse mounds on tergites II-VII, mounds with a medio-posterior spine each (092c.jpg). Pedes spurii A absent, pedes spurii B at the anterior corners of segment I. Sternites almost without shagreen, with a pair of mid-posterior mounds, without teeth but each bearing a long seta. Comb of segment VIII absent.
Anal segment: Anal lobes without fringe (092d.jpg). Genital sheaths in female distally trilobate.

Species keys out at Page 105: Chironomini 2 Rheomus of the Text Key.

SW. Europe and north Africa.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Large rivers with sandy substratum.