Author: (Malloch, 1915)
Diagnosis (Material in coll. ZSM)
Exuviae 6.8-7.1mm long (n=3).
Cephalothorax: Frontal setae on frontal apotome, 70-100µm long (n=4). Thoracic horn 520-570µm long; ThR 5.3-7.1 (n=4). Thoracic horn small-toothed, not bifid or strongly jagged at apex.
Abdomen: Dorsal anterior transverse apodeme of segment II colourless medially, giving the appearance of being incomplete. Tergites without a median transverse row of strong points. Tergites III-V between the dorsal setae with more or less evenly distributed small points, which are gradually a little larger posteriorly on each segment. Three or four lateral setae on segments II-VI, not taeniate; lateral taeniae of segments VI-VIII: 2,4,4.
Anal segment: Anal lobe ratio 1.6-1.7 (n=4). Fringe of anal lobe with 24-32 weak, flexible taeniae (n=4), inserted in a nearly regular row continued to the bases of the anal macrosetae; longest taeniae 117-205µm long, 10µm wide, length 0.24-0.44x lobe length (n=3) (041h.jpg). Three anal macrosetae on each anal lobe, length 0.85-0.89x lobe length (n=3). Genital sheaths without an apical papilla.
Species keys out at Page 646: Orthocladiinae 58 Hydrobaenus of the Text Key.
Distribution
Holarctic species: widespread in Europe (not Mediterranean).
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Stagnant and slow-flowing water.