Chaetocladius dissipatus

Author: (Edwards, 1929)

Exuviae 4.1-5.2mm long (n=4).
Cephalothorax: Frontal setae 70-105µm long (n=4). Thoracic horn elongate, 130-250µm long, small-toothed, pointed at apex; ThR 4.6-8.3 (n=7). Precorneal setae 1-3: 90-135; 80-125; 80-90µm long (n=3).
Abdomen: Tergite I armed at least antero-laterally. 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. On tergite III, the points between setae D1 are not noticeably larger than those anteriorly and posteriorly. Most of the points on the pleura of segment IV similar in size to those on the tergite. Posterior transverse tooth rows of sternites III-VIII continuous, or broken medially, the colourless teeth intermittently dispersed across the sternites (063i.jpg). Two of the lateral setae of segments II-V short and spine-like (063h.jpg). Lateral setae 1-4 of segment IV: 75-85; 80-115; 78-95; 45-75µm long (n=4); 1 and 3 robust, 2 about one third their diameter and only about one fifth the length of the segment, 4 very narrow; length longest lateral seta 0.21-0.24 length IV (n=4).
Anal segment: Anal lobes rounded laterally, fringe absent. Anal lobes with three thorn-like macrosetae, short and strong, 33-52µm long (n=7); length 2.7-4.5x width (n=4); one seta is situated in the proximal half of the lobe, the other two in the distal half (063j.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 798: Orthocladiinae 210 Chaetocladius of the Text Key.

Widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams and lakes in montane regions.