Stictochironomus crassiforceps

Author: (Kieffer, 1922)

Diagnosis (Material in coll. ZSM)
Exuviae 6.2-7.8mm long (n=7).
Cephalothorax: Cephalic tubercles 150-220µm long (n=4); long and curved, armed apically with short points, which at maximum expression form a crown around the base of the seta (117h.jpg). Frontal setae less than half the length of the tubercles (but easily broken off), 30-80µm long (n=6). Thoracic horn very much branched, branches much shorter than half the length of the abdomen. Thorax with conspicuously large granules near suture (112b.jpg).
Abdomen: Length hook row II 0.59-0.79x width tergite; hooks 75-115 (n=4). Anterior transverse point bands of tergites II-VI separated from the median patches by a bare space, anterior points not conspicuously stronger. At least segments III and IV with an apical band of points which may be medially interrupted. Sternite I with armament (tubercles or spinulate points) mainly restricted to antero-lateral area, or absent. Vortex present. Comb of segment VIII with 6-9 marginal teeth, frequently subdivided. Comb on a strongly projecting spur, the lateral teeth not, or hardly, spreading anteriorly beyond the level of the posterior margin of the tergite (117i.jpg). Lateral taeniae of segments V-VIII: 3,3,4,4.
Anal segment: Fringe of anal lobe with 27-57 taeniae (m=37.9, n=17).

Species keys out at Page 278: Chironomini 175 Stictochironomus of the Text Key.

Widespread in (northern) Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes