Cricotopus ephippium

Author: (Zetterstedt, 1838)

Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 4.1-5.5mm long (n=7).
Cephalothorax: Cephalic tubercles absent; frontal setae on praefrons, 60-85µm long (n=2). Thoracic horn usually elongate, 63-215µm long, toothed, but may be reduced to a smooth oval bulb; ThR 2.5-10.8 (n=7) (090e.jpg). Thorax anteriorly strongly rugosely wrinkled, the ridges near the suture in part minutely toothed (090f.jpg), elsewhere extensively wrinkled or feebly granulate, the granulations extending at least as far as the base of the wing sheaths.
Abdomen: Length hook row II 0.38-0.51 of width tergite II (n=3); hooks 48-102 (n=7) in 2-3 rows. Strong shagreen on III-VI, anterior and posterior bands separate or fused, not exceeding lateral adhesion marks. Apical transverse bands of tergites III-V composed of points, point band of tergite VI complete. Point patches absent on tergites VII and VIII. Pedes spurii B of segment II very weak. 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: 1,3-4,3-4,3-4,4,4,4,1-0; lateral seta 4 on VIII stronger than seta 3 but not stronger than the other lateral setae.
Anal segment: Anal lobe ratio 1.5-1.8 (n=7). Anal lobes without fringe. The three anal macrosetae more or less equally strong; length 0.54x length of the anal lobe (n=1).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 932: Orthocladiinae 343 Cricotopus of the Text Key.

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

Ecological notes
Montane and northern lakes.