Synorthocladius semivirens

Author: (Kieffer, 1909)

Exuviae 2.3-3.3mm long (m=2.6mm, n=19) (063-1.jpg).
Cephalothorax: Thoracic horn absent. Thorax wrinkled finely near suture.
Abdomen: Hook row II 0.67-0.85x width tergite II. Tergites IV-VIII posteriorly with a transverse row of points which are largest on VI and VII and progressively reduced on preceding and succeeding segments (063b.jpg).
Anal segment: Anal lobe ratio 1.6, 1.7 (n=2). Anal lobes without fringe; lobes distally truncated with one strong, straight spinous apical seta and the other two external to it progressively reduced in size, and with 2-6 additional teeth apico-laterally (063c.jpg). Length of anal macrosetae 0.45-0.53x length of the anal lobe (n=5).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 800: Orthocladiinae 212 Synorthocladius of the Text Key.

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

Ecological notes
Northern and montane streams, lakes and pools; southern streams.