Limnophyes pumilio

Author: (Holmgren, 1869)

Diagnosis (in part after Saether, 1990a - in italics)
Exuviae 3.2-3.5mm long (n=4).
Cephalothorax: Frontal setae on frontal apotome. Ocular field with 1 vertical and 1-2 postorbitals. Thoracic horn reduced to a small tubercle. Precorneal tubercle present, 3 fine and short precorneals. 2 Median and 1 lateral, fine antepronotals. 4 Dorsocentrals; Thorax and wing sheaths smooth.
Abdomen: Tergites generally covered with small points, larger anteriorly. Tergite I without shagreen; II-VIII with posterior transverse rows of translucent or slightly darkened elongate spines. Posterior long spines IV 71-108, VI 47-73 (n=4). Longest spine IV 73-75µm, VI 70-93µm long (n=4). Paratergite IV armed with small points. Pedes spurii Aand B absent. Lateral setae of segment IV 125-160µm long (n=4). Four long lateral setae on segment VIII, the fourth very small and inconspicuous, 0-117µm long (n=4).
Anal segment: Anal lobes smooth, somewhat rectangular, without fringe (150d.jpg). Anal macrosetae of anal lobes long, 0.85-1.0x length of the anal lobe (n=5), setae thin and apically curved. Genital sheaths either short or overreaching by ± 45µm in male; sheaths in male with more or less well developed apico-lateral tubercle.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 759: Orthocladiinae 171 Limnophyes of the Text Key.

Holarctic species: northern half of Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Lakes, more common in the north.