Micropsectra pe5

new form

Exuviae 6.5-7.9mm long (m=7.3mm, n=11).
Cephalothorax: Frontal setae 136-204µm long (n=6). Antennal sheath bases with large, bluntly conical projections. Thoracic horn 440-780µm long (m=690µm, n=9); ThR 7.3-11.3 (m=8.7, n=8). Length horn seta 0.33-0.61x horn length.
Abdomen: Length hook row II 0.5x width tergite II (n=2); hooks 111-192 (n=4). Tergite III with a postero-median patch of dense narrow points (about 12µm long) on each side (147g.jpg). Points of the lateral bands on tergites IV and V posterior to the anterior point patches, very small, with little variation in size, the bands, at least on IV, fused across the mid line. Males with anterior point patches on tergites IV-VI, females on IV and V only. Comb of segment VIII 32-68µm wide (m=48.2µm, n=11); with 4-12 short, broad marginal teeth (m=7.4, n=11). Lateral taeniae of segments IV-VIII: 1,3,4,4,5.
Anal segment: Fringe of anal lobe complete, with 44-60 taeniae (m=52.1, n=12).

Form keys out at Page 508: Tanytarsini 149 Micropsectra of the Text Key.

North-west Spain, Portugal.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Stagnant zones of small streams, cattle troughs, larger temporary tarns.