Orthocladius rivicola

Author: Kieffer, 1911

Diagnosis (in part after Soponis, 1990a - in italics)
Exuviae 2.3-3.1mm long (n=8).
Cephalothorax: Frontal warts and cephalic tubercles absent. Antennal sheath base without a sharp tooth. Thoracic horn 45-70µm long (n=6), ellipsoid, dark brown, filled or clear, stalked; ThR 1.3-1.8 (n=6). Precorneals clumped, seta 1 usually longer and thicker than setae 2 an 3. 2 Median antepronotals, 1 lateral antepronotal. 3 Dorsocentrals (073j.jpg), narrow, strong to weak, about as long as precorneal seta 1. Thorax dorsally wrinkled along eclosion line.
Abdomen: Tergite I bare; II-VIII with small point patches anteriorly; IV-VIII with central point patch anteriorly. Posterior transverse point bands restricted to tergites IV-VIII; bands conspicuous, of small points, 3-7 points deep, and narrow, stopping well short of setae D5 anteriorly (073k.jpg). Sternite I bare; II-VIII with central point patch anteriorly. Pedes spurii A and B absent. Dorsal setae I-VIII: 4,4,5,5,5,5,5,1; Ventral setae I-VIII: 2,3,3,2,2,3,3,0; Lateral setae I-VIII: 1,3,3,3,3,3,3,2; Od setae I-VIII: 0,0,0,0,0,0,0,0.
Anal segment: Anal lobe greatly reduced, with 2 setae, one on distal half and one at midpoint. Genital sheaths extended beyond lobe in males and females.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 847: Orthocladiinae 258 Orthocladius of the Text Key.

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

Ecological notes