Author: (Zetterstedt, 1850)
Diagnosis (in part after Hirvenoja, 1973a - in italics)
Exuviae 3.2-6.6mm long (m=5.2mm, n=22) (080-1.jpg).
Cephalothorax: Frontal setae on weak cephalic tubercles situated anteriorly on the frontal apotome. Thoracic horn 190-395µm long (m=306µm, n=23); elongate, toothed (more densely towards apex) and narrowed to a pointed tip (080b.jpg). ThR 7.6-22.3 (m=16, n=23). Dorsocentral setae without great differences in breadth. Surface of thorax slightly wrinkled.
Abdomen: Length hook row II 0.37-0.42 of width tergite II (n=6); with 52-65 (m=59.8, n=5) hooks, usually in two rows. Tergites (II)III-VI with a median transverse pair of point patches, often joined by small points (080c.jpg). Tergites VII and VIII without armament. Pedes spurii B well developed on segment II, weaker or absent on segments I and III. Dorsal setae I-VIII: 4,4,5,5,5,5,5,2; Lateral setae I-VIII: 1,3,3,33-4,3-4,4,4,4; Ventral setae I-VIII: 0,3,4,4,4,4,4,1; lateral seta 4 on VIII clearly stronger than the other lateral setae.
Anal segment: Anal lobe ratio 1.1-1.6 (n=6). Anal lobes without fringe. Lobes with 3 strongly curved macrosetae, of equal length (080d.jpg); length of setae 0.6-1.3x length of the anal lobe (m=0.8, n=15).
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 877: Orthocladiinae 288 Acricotopus of the Text Key.
Distribution
Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Standing water.