Protanypus caudatus

Author: Edwards, 1924

Exuviae 9.3-10.5mm long (n=3).
Cephalothorax: Cephalic tubercles 130, 130µm long; 140, 160µm wide (n=2). Frontal setae 520, 525µm long (n=2). Anterior thoracic tubercles smaller than the cephalic tubercles, 50µm long; 50µm wide (n=1) (026i.jpg). Thoracic horn 470-500µm long; ThR 8.2-11.8 (n=3).
Abdomen: Anterior abdominal tergites virtually unarmed; posterior tergites progressively more extensively armed with minute points. Sternites armed with nail-like spinules, strongest on anterior sternites. Colour golden brown with brown anterior edges to the abdominal segments.
Anal segment: Anal lobe ratio 1.7-1.8 (n=3). Each anal lobe bears about ten marginal setae, the posterior of which are spine-like and inserted in conspicuous sockets (026h.jpg) (these setae are often broken off, but their sockets remain.)
(Linked adult male: Saether, 1975b)

Species keys out at Page 527: Diamesinae 3 Protanypus of the Text Key.

Holarctic species: Fennoscandia and central European alpine region.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Northern lakes.