Orthocladius ruffoi

Author: Rossaro and Prato, 1991

Exuviae 4.2-5.6mm long (n=5) (076-2.jpg).
Cephalothorax: Thoracic horn 195-350µm long (076f.jpg); ThR 4.3-11.6 (n=6). Four dorsocentral setae, the first, third and fourth thick, the second conspicuously thinner.
Abdomen: Segments more or less evenly brownish. Hook row II a discrete pad or band of hooks, less than 0.34x width of segment II, usually of three or more transverse rows of hooks. Median point patches and posterior transverse bands of tergites II-VI separated for their width by a narrow point-free band, or rarely narrowly joined far laterally (076g.jpg). Pedes spurii B absent. All five lateral setae of segment VIII particularly conspicuous, nearly to over half the length of segment VIII, brown.
Anal segment: Anal lobe ratio 1.3-1.8 (n=5). Anal lobes without taeniate fringe, but with a lateral fringe of sparse hair-like teeth and strong apical teeth (076h.jpg). Length of anal macrosetae 0.92-1.1x length of the anal lobe (n=5), sinuate, brittle, not hooked at tip.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 859: Orthocladiinae 270 Orthocladius of the Text Key.

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

Ecological notes