Cricotopus ornatus

Author: (Meigen, 1818)

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 5.4-6.3mm long (n=4) (085-1.jpg).
Cephalothorax: Frontal setae on frontal apotome, 235-275µm long (n=3). Thoracic horn long (385-470µm), often with sparse minute teeth, dark grey or black, but brittle and frequently fragmentary, or missing; ThR 6.4-11.8 (n=3). Precorneal setae not on conspicuous mounds; one precorneal seta small and thin, the other two long and robust (085b.jpg).
Abdomen: Length hook row II 0.39-0.48 of width tergite II (n=4); hooks 65-113 (n=4) in 2-3 transverse rows. Small pedes spurii B present on segment II, very weak on III. Shagreen strong, uniformly covering the tergites II-VI, on VI only the postero-lateral corners smooth. Segments II-VI usually each with a distinct dark posterior transverse band (085c.jpg). 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: ?0-1,3,3-4,4,4,4,4,1; lateral seta 4 on VIII not stronger than the other lateral setae.
Anal segment: Anal lobe ratio 1.7-2.1 (n=7). Anal lobes without fringe. Length of anal macrosetae 0.28-0.41x length of the anal lobe (n=7) (085d.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 902: Orthocladiinae 313 Cricotopus of the Text Key.

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

Ecological notes
Stagnant water, often brackish.