Natarsia nugax

Author: (Walker, 1856)

Diagnosis (n=2 unless stated otherwise)
Exuviae 6.7mm long (n=1) (017-1.jpg).
Cephalothorax: Thoracic horn 380, 420µm long; ThR 2.5. Plastron plate 165x110µm (n=1); plate length 0.26 of horn length (n=1). (017b.jpg)
Abdomen: Segments I-VII each with one long lateral taeniate seta and a very short seta inserted close to its base. Anterior lateral taenia of segment VII at 0.45, 0.58 of length segment VII. Segments VIII and IX laterally with long taeniae.
Anal segment: Anal lobe ratio 2.3, 2.5. Insertion of anterior anal taenia at 0.30, 0.31 of length anal segment. (017c.jpg)
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 71: Tanypodinae 57 Natarsia of the Text Key.

W European.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Cool water species, larvae in springs, groundwater fed streams, and shallow parts of alpine lakes (Janecek, 1999a).