Stempellina almi

Author: Brundin, 1947

Diagnosis (n=1)
Exuviae 3.4mm long.
Cephalothorax: Cephalic tubercles absent. Frontal setae elongate, flexible, narrow taeniate, 100µm long. Antennal sheath bases with a sharp conical projection. Thoracic horn 295/305µm long; ThR 7.2/6.6; horn broad to nearly half its length and then gradually tapered to tip (129f.jpg). Thorax anteriorly thickly set with short conical teeth.
Abdomen: Length hook row II 0.46x width tergite; hooks 104. Tergites III-VI with a narrow longitudinal band of points on each side of the mid-line, posteriorly widened or even extended laterally for a short distance, best developed on tergite V (129i.jpg). Pedes spurii B II weak. Segment VIII without lateral spurs in addition to the one or two postero-lateral spurs. Lateral taeniae of segments V-VIII: 3,4,4,3.
Anal segment: Anal lobe ratio 1.1. Fringe of anal lobe with 20/23 taeniae.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 367: Tanytarsini 10 Stempellina of the Text Key.

Holarctic species: Fennoscandia, Britain and north Africa.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
R. Thames, England.