Cricotopus sylvestris

Author: (Fabricius, 1794)

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 3.8-6.6mm long (n=69).
Cephalothorax: Frontal setae on frontal apotome, 195-385µm long (n=36), over 3µm thick, at least as thick as the precorneal setae. Thoracic horn 215-480µm long (n=55), colourless, golden, pale golden brown or grey; ThR 8.5-20.7 (n=55) (085e.jpg). Precorneal setae not on conspicuous mounds.
Abdomen: Length hook row II 0.43-0.62 of width tergite II (n=37); hooks 60-125 (n=30) in 2-3 transverse rows. Pedes spurii B on segment II conspicuous, on III faintly present (085f.jpg). Uniform shagreen on tergites II-VI, points between antero-median and postero-median adhesion marks slightly more prominent. Anterior tergites with the anterior transverse band about as wide as the tergite. Point patches absent on tergites VII and VIII. Dorsal setae I-VIII: 3,4,4,5,5,5,5,2; Lateral setae I-VIII: 1,3,3,3,3,3,3,4; Ventral setae I-VIII: 1,3,3,3-4,4-5,4-5,4-5,2; lateral seta 4 on VIII about as strong as the other lateral setae but often shorter.
Anal segment: Anal lobe ratio 1.6-2.4 (n=20). Anal lobes without fringe. Length of the three anal macrosetae 0.41-0.57x length of the anal lobe (n=44).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 905: Orthocladiinae 316 Cricotopus of the Text Key.

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

Ecological notes
Mainly standing or slow flowing water, but occurs in streams.