Author: (Garrett, 1925)
Diagnosis (n=3)
Exuviae 3.4-3.6mm long (003-2.jpg).
Cephalothorax: Thoracic horn 338-350µm long; ThR 1.7-1.9. Plastron plate massive, over half the length of the horn, length 0.52-0.7 of horn length. (003e.jpg)
Abdomen: Posterior margins of segments III-VIII tucked in to form a stiff ridge, at the lateral extremity of which the segment projects as a strong tooth. Segment VIII not extended posteriorly on each side of segment IX.
Anal segment: Anal lobes with a peg-like apical spur, which bears one or two small setae at the tip (003f.jpg) (but these may be broken off).
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 13: Podonominae 7 of the Text Key.
Distribution
Holarctic species: Northwest Europe.
(For more information see module IdentifyIt – file: Other subfamilies).
Ecological notes
Cold water: springs, streams and fast flowing rivers.