Cricotopus perniger

Author: (Zetterstedt, 1850)

Diagnosis (Material in coll. ZSM; in part after Hirvenoja, 1973a - in italics)
Exuviae 3.0-3.3mm long.
Cephalothorax: Frontal setae on frontal apotome. Thoracic horn club-shaped with a narrow neck, toothed, apically pointed. Precorneal setae not on conspicuous mounds.
Abdomen: Hook row II with 48-81 hooks (m-62.7, n=15) in 2-3 rows. Small pedes spurii B present on segment II, slightly wrinkled. Strong shagreen on tergites III-VI, anterior and posterior point patches separate, shagreen not overreaching lateral adhesion marks throughout the entire length of the segment. Median point patch of tergites III and IV widely separated from the posterior transverse band AND extended antero-laterally in front of the anterior adhesion marks. Point patches absent on tergites VII and VIII. 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; lateral seta 4 on VIII not stronger than other lateral setae.
Anal segment: Anal lobes without fringe. Anal lobe setae more than half the length of the lobes.

Species keys out at Page 901: Orthocladiinae 312 Cricotopus of the Text Key.

Circum-Baltic, the Netherlands.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes