Nanocladius bicolor

Author: (Zetterstedt, 1838)

Exuviae 2.9-3.9mm long (m=3.2mm, n=30).
Cephalothorax: Thoracic horn elongate, 165-275µm long (m=254µm, n=30), narrow, widest at base and gradually narrowed to a pointed tip; usually short toothed towards and at apex (044e.jpg); ThR 3.7-10.6 (m=8.3, n=30).
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 (frequently 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 1.3-1.7 (m=1.5, n=18). Anal fringe of 22-34 taeniae (m=27, n=32). The three anal macrosetae situated apically on the anal lobes.
(Linked adult male: Langton and Pinder, 2003a)

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

Palaearctic species: widespread in Europe, eastern Mediterranean.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Stagnant water and slow flowing parts of rivers and streams; larvae on submerged vegetation and in filamentous algae.