Nanocladius distinctus

Author: (Malloch, 1915)

Diagnosis (n=5, leg. R.S. Wilson, A. Klink.)
Exuviae 2.5-3.3mm long.
Cephalothorax: Thoracic horn 150-200µm long, narrow, widest at base and gradually narrowed to a pointed tip, usually with long apiculate teeth towards and at apex (150f.jpg); ThR 5.0-9.0.
Abdomen: Hooks of hook row II short, strongly curved, crowded on a postero-median projection of the tergite. Tergites III-VIII with restricted shagreen, at least on VII and VIII, with conspicuous large points medially and/or posteriorly. Median point patches present on tergites IV (rarely absent) V, VI, single or paired (?). Points of point patches small, the longest less than 30µm long, usually shorter than the longest tooth of the posterior transverse rows. Apical point band on segment III entire, on IV entire or medially broken. Pedes spurii B on segment II conspicuously large, usually elongate conical in shape. Three or four lateral setae on segments II-VI, not taeniate; lateral taeniae of segment VI-VIII: 1/4,4,5.
Anal segment: Anal lobes not drawn out posteriorly into a tooth or spur. Anal lobe ratio 1.2-1.6. Anal fringe of 39-50+ taeniae. The three anal macrosetae situated apically on the anal lobes.
(Linked adult male: Saether, 1977a)

Species keys out at Page 669: Orthocladiinae 81 Nanocladius of the Text Key.

Holarctic species: Russian Federation, France, the Netherlands.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Large rivers: lower Rhine, Meuse and Rhone.