Cricotopus cylindraceus

Author: (Kieffer, 1908)

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 2.9-3.5mm long (n=5) (4.0-5.0mm). Colour evenly lightly infuscate.
Cephalothorax: Cephalic tubercles absent; frontal setae on praefrons, 40, 55µm long (n=2). Antennal sheath base with a large conical projection. Thoracic horn 78-125µm long; ThR 6.9-10.0 (n=5) (091k.jpg).
Abdomen: Length hook row II 0.33-0.43 of width tergite II; hooks 37-45 (n=4). Shagreen on tergites III-VI, anterior patches much wider than long, clearly separated from the posterior patches. Tergite III with the median band transversely lens-shaped and the posterior band extending much further laterally than the apical band (091l.jpg). Point patches absent on tergites VII and VIII. Pedes spurii B weakly developed on segment II, weaker on segment III. Dorsal setae I-VIII: 4,4,4,5,5,5,5,2; Lateral setae I-VIII: 1,3,3,3,3,3,3,4; Ventral setae I-VIII: 1,4,4,4,4,4,4,1; lateral seta 4 on VIII not stronger than the other lateral setae; ventral setae only indicated on segment VIII.
Anal segment: Anal lobe ratio 1.6-1.8 (n=5). Anal lobes without fringe. Anal macrosetae more or less equally strong; length 0.73-0.86x length of the anal lobe (n=5).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 951: Orthocladiinae 362 Cricotopus of the Text Key.

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

Ecological notes
Streams and stagnant water.