Cricotopus patens

Author: Hirvenoja, 1973

Diagnosis (Material in coll. ZSM; in part after Hirvenoja, 1973a - in italics)
Exuviae 3.2-3.9mm long.
Colour: Abdominal segments II-V very dark, thorax and posterior abdominal segments bright.
Cephalothorax: Cephalic tubercles absent; frontal setae on frontal apotome. Antennal sheath base at most with a very weak projection. Thoracic horn 43-111µm long (m=77µm); ThR 4.0-12.3 (m=7.3, n=15).
Abdomen: Point patches absent on tergites VII and VIII. Pedes spurii B present on segments II and III, very small on III. Anterior and posterior point patches on tergites III-VI clearly separated, the anterior patches kidney-shaped. 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: 1,4,4,4,4,4,4,0; lateral seta 4 on VIII not stronger than the other lateral setae; ventral setae only indicated on segment VIII.
Anal segment: Anal lobes without fringe. Anal macrosetae more or less equally strong, about 150µm long, just over half the length of the anal lobes.

Species keys out at Page 952: Orthocladiinae 363 Cricotopus of the Text Key.

Holarctic species: Fennoscandia, the Netherlands, Italy.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Northern standing waters.