Cricotopus vierriensis

Author: Goetghebuer, 1935

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 2.7-3.1mm long (n=6).
Cephalothorax: Cephalic tubercles absent; frontal setae on frontal apotome just anterior to mid-line between the antennal bases. Thoracic horn broad, 135-165µm long, obliquely truncate apically, distally with small spines (089k.jpg); ThR 2.1-2.5 (n=6). Dorsocentral setae characteristic: the second (150µm or more long) is at least twice as long as the first, which is in turn about twice as long as the third, which is a little longer than the fourth. Thorax granulate, especially anteriorly.
Abdomen: Length hook row II 0.37-0.40 of width tergite II (n=5); hooks 46-57 (n=6). Median transverse point band of tergites IV and V deeper, extending into the second quarter of the tergite. Median point band of tergite III transverse and narrow (occasionally absent), situated in the third quarter of the segment (089l.jpg). Pedes spurii B present on segments II and III, usually conspicuous. Point patches absent on tergites VII and VIII. On tergites III-VI the anterior and posterior point patches clearly separate, anterior patches crescent-shaped. Dorsal setae I-VIII: 4,4,4,5,5,5,5,2; Lateral setae I-VIII; 1,3,3,3,3,3,4,4; Ventral setae I-VIII: 1,3,3-4,3-4,3-4,3-4,4,0; other lateral setae on VIII longer than lataeral seta 4.
Anal segment: Anal lobe ratio 1.4-1.5 (n=6). Anal lobes without fringe. Anal macrosetae more or less equally strong, 0.70-0.85x length of the anal lobe (n=6).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 929: Orthocladiinae 340 Cricotopus of the Text Key.

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

Ecological notes
Montane streams and lakes.