Diamesa laticauda

Author: Serra-Tosio, 1964

Diagnosis (n=1, material in coll. Serra-Tosio)
Exuviae 5.0mm long.
Cephalothorax: Frontal setae 150µm long. Thoracic horn 215µm long; ThR 5.0. Lateral antepronotal seta absent or minute, difficult to distinguish. Precorneal setae 2,3: 175; 150µm long.
Abdomen: Hook row II absent. Total dorsal teeth I-VIII 107; total ventral teeth IV-VIII 62. Posterior to tooth row on tergite VII there is a narrow band of points a little more robust than on the tergite, thereafter the conjunctive is densely armed with minute points (029e.jpg). Points on tergite III 8µm long. Abdomen with neat, more or less isodiametric reticulation, obvious on anterior tergites and paratergites, in general evanescing progressively posteriorly but extending at least to paratergite VI laterally. Relative length segments IX:VIII:VII = 1.0:0.53:0.78; relative width segments IX:VIII:VII = 1.0:1.2:1.5. Segment VIII 2.7 and segment VII 2.25 times as wide as long. Lateral setae 1-4 of segment III 60; 55; -- 63; 85µm long.
Note: Pale golden brown; dorsal anterior transverse apodemes weak, brown between apodemes and anterior edge of tergite, i.e. broadest medially; posterior tooth rows on a distinctly golden-brown transverse band, the brown teeth small (about 25µm long) set on broad gold mounds; the area behind the tooth rows nearly colourless, but the posterior edge of the segment is brownish.
Anal segment: Points of tergite IX (at least anteriorly) spreading across anal lobes. Male genital sheaths with a mid-lateral invagination (029f.jpg). Anal lobe ratio 1.7. Each anal lobe with 3 macrosetae; length macrosetae 0.59x lobe length.

Species keys out at Page 557: Diamesinae 33 Diamesa of the Text Key.

Central European Alpine region.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Glacial torrents at about 2,000m asl.