Cricotopus tristis

Author: Hirvenoja, 1973

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae about 4.5mm long.
Cephalothorax: Cephalic tubercles and frontal setae absent. Thoracic horn colourless, 22-27µm wide, 157-174µm long, especially distally with points; ThR 6.4-7.2; Thorax dorsally weakly wrinkled, partly granulate.
Abdomen: Hook row II with 55-62 hooks in 2-3 rows. Strong point patches on tergites III-VI, anterior and posterior bands more or less clearly separate, anterior band kidney-shaped. Point patches absent on tergites VII and VIII. Pedes spurii B conspicuous on segments II and III, but not strongly projecting. Dorsal setae I-VIII: 4,4,4,5,5,5,5,2(1); Lateral setae I-VIII: 1,3,3,3,3,3,4,4(5); Ventral setae I-VIII: 1,3,3-4,3-4,4,4,4,1; lateral seta 4 on VIII slightly stronger than the other lateral setae, lateralmost dorsal seta nearly in line with the lateral setae.
Anal segment: Anal lobes without fringe. Anal macrosetae more or less equally strong, about 150µm long.
(Linked adult male: Hirvenoja, 1973a)

Species keys out at Page 948: Orthocladiinae 359 Cricotopus of the Text Key.

Holarctic species: widespread in Europe (not Mediterranean).
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Northern slow-flowing streams.