Heleniella dorieri

Author: Serra-Tosio, 1967

Diagnosis (n=1, material in coll. ZSM)
Exuviae 3.8mm long.
Cephalothorax: Thoracic horn elongate, 288µm long, pointed at tip and toothed; ThR 6.8.
Abdomen: Anterior transverse bands of tergites II-IV broad, especially medially, of isolated sturdy points. Tergites without longitudinal ridges posteriorly. Tergites II-VII or II-VIII each with a posterior transverse row of teeth which may be flattened and contiguous, without a similar anterior transverse row. Apical transverse bands of tergites II-IV with the basal swellings of the points expanded and their points in general missing, giving the appearance of a band of irregular granules (061d.jpg). Sternite I with a nearly circular patch of strong points on each side in the region of setae V3 and V4, which they may embrace. Sternites II and III armed with strong spines anteriorly (060g.jpg).
Anal segment: Anal lobes flat, without strong teeth along the lateral margins and not extended posteriorly into a downwardly curved point. Anal lobe ratio 3.4. Anal lobes with 3 apical setae which may be very reduced and difficult to see.

Species keys out at Page 774: Orthocladiinae 186 Heleniella of the Text Key.

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

Ecological notes
A glacial brook, 2023m asl, French Alps.