Chaetocladius melaleucus

Author: (Meigen, 1818)

Exuviae 3.0-6.0mm long (n=11).
Cephalothorax: Frontal setae 63-95µm long (n=6). Thoracic horn elongate, 80-283µm long, small-toothed, pointed at apex; ThR 4.6-8.2 (n=9).
Abdomen: Tergite I usually covered with points, but the median area may be unarmed, the lateral bands joined posteriorly by a broad band of points. Tergites II-VIII posteriorly with a conspicuous narrow transverse band of teeth, the remainder of the tergites covered with small points. Points of apical bands smaller than those in mid-tergite on segments III-VI. Posterior transverse tooth rows of sternites III-VIII indistinct laterally, the conspicuous larger, colourless teeth grouped in a transversely oval median patch (063k.jpg). Two of the lateral setae of segments II-V short and spine-like. Lateral setae 1-4 of segment IV: 65-88; 100-115; 80-105; 60-110µm long (n=7); 2 about one third the diameter of 1 and 3, 4 very narrow; length longest seta 0.2-0.32 length IV (n=8).
Anal segment: Anal lobes rounded laterally, fringe absent; lobe with 3 apical macrosetae short and strong, thorn- or spine-like, 15-60µm long (n=11); length 2.3-5.5x width lobe (n=7).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 795: Orthocladiinae 207 Chaetocladius of the Text Key.

Palaearctic and Afrotropical species: widespread in Europe, Middle East.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams, ditches and lakes in montane regions. (Damp soil. Harrison, 2000a)