Pentaneurella katterjokki

Author: Fittkau and Murray, 1983

Diagnosis (n=5, unless stated otherwise, material in coll. ZSM)
Exuviae 4.6-5.8mm long (m=5.1mm) (025-1.jpg).
Cephalothorax: Thoracic horn 300-350µm long (m=320µm), curved shortly after the base, more or less parallel-sided or widened towards apex, toothed; the basal tubercle rounded; ThR 2.8-3.3 (n=4). Plastron plate 85x50, 90x55µm (n=2), offset at horn apex, without a rim. Respiratory atrium thin-walled, 0.61, 0.63 times lumen width (n=2), at most a little undulate marginally. Neck 8-13µm wide (n=3) and about 6µm long (025b.jpg). Thorax comb well-developed, composed of strong, more or less parallel-sided teeth.
Abdomen: Tergite I with a median mark. Tergites and sternites I-VI armed at most with minute points, on III-VI contrasting with the parasternites which are densely armed with stronger points. Segment VII transversely rectangular, anterior lateral taenia at 0.46-0.51 of length segment VII (m=0.48). Anterior lateral taenia of segment VIII at 0.26-0.33 of length segment VIII (m=0.29).
Anal segment: Anal lobes without a thickened lateral edge, toothed strongly both externally beyond the lateral taeniae and internally, both margins convexly narrowed to apex. Anal lobe ratio 2.7-3.1 (m=2.9). Insertion of anterior anal taenia at 0.33-0.42 of lobe length (m=0.39). (025c.jpg)

Species keys out at Page 92: Tanypodinae 78 Pentaneurella of the Text Key.

Palaearctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Springs and spring-fed mountain streams above the tree line in Fennoscandia.