Author: (Edwards, 1929)
Diagnosis
Exuviae 2.3-3.3mm long (n=8) (060-2.jpg).
Cephalothorax: Thoracic horn elongate, 165-250µm long, pointed at tip and toothed (060f.jpg); ThR 7-10 (n=8).
Abdomen: Anterior transverse bands of tergites II-IV narrow, of scale shagreen (061c.jpg). Apical transverse bands of tergites II-IV composed of unmodified points. Tergites without longitudinal ridges posteriorly. Tergites II-VIII each with a posterior transverse row of teeth which may be flattened and contiguous, without a similar anterior transverse row (060h.jpg). Sternite I with an extended irregular patch of shagreen points embracing setae V3 and V4 on each side (061b.jpg). 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 (060i.jpg). Anal lobe ratio 1.8-2.3 (n=3). Anal lobes without fringe; with 3 apical setae which may be very reduced and difficult to see.
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 775: Orthocladiinae 187 Heleniella of the Text Key.
Distribution
Palaearctic species: widespread in Europe, circum-Mediterranean.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Northern and montane streams and lakes; lowland springs.