Paratrichocladius osellai

Author: Rossaro, 1990

Diagnosis (Material in coll. Rossaro; in part after Rossaro, 1990a - in italics)
Exuviae 4.4-5.8mm long (n=3).
Cephalothorax: Thoracic horn and frontal setae absent.
Abdomen: Length hook row II 0.55x width of tergite II; hooks 87 (n=1). Segments II-VIII with conspicuous armament covering all or much of the tergites (081b.jpg). Tergite III with posterior points large, as large as the points of the apical band and of similar size to the posterior points of tergites IV-VI, forming a conspicuous transverse band behind the posterior adhesion marks. Apical hooklets of tergites III-V smaller than those of hook row II. Spines on conjunctives III/IV, IV/V and V/VI less well developed than in Paratrichocladius guidalii. Conjunctival spines of both species fall within the range of the very variably Paratrichocladius skirwithensis. Pedes spurii A well developed on sternites IV-VI.
Anal segment: Anal lobe ratio 2.3, 2.7 (n=2). Length anal macrosetae 0.63-0.82x length of the anal lobe (n=3).

Species keys out at Page 882: Orthocladiinae 293 Paratrichocladius of the Text Key.

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

Ecological notes
Montane streams.
In glacier-fed waters (Laville and Reiss, 1992a).