Xenopelopia nigricans

Author: (Goetghebuer, 1927)

Diagnosis (n=6, unless stated otherwise)
Exuviae 4.4-5.4mm long (4.9mm, n=5) (024-2.jpg).
Cephalothorax: Thoracic horn 425-512µm long (m=487µm, n=5), with rounded basal tubercle; ThR 4.9-6.8 (m=5.8). Plastron plate length 142-188µm; length 0.29-0.38x horn length; rim absent. Atrium of thoracic horn narrow and with exceedingly thickened wall, straight or slightly sinuous before the apical twist (024e.jpg). Thorax smooth. Thorax comb well-developed, composed of strong, more or less parallel-sided teeth.
Abdomen: Tergite I with a median mark. Segment VII transversely rectangular. Anterior lateral taenia of segment VII at 0.36-43 of length segment VII (m=0.40). Anterior lateral taenia of segment VIII at 0.27-0.33 of length segment VIII (m=0.32). Armament of sternite VII with a larger medial bare area extending into the anterior half. Segments VI-VIII nearly uniform in colour.
Anal segment: Anal lobes without a thickened lateral edge; toothed externally only. Anal lobe ratio 2.8-3.2 (m=3.1). Insertion of anterior anal taenia at 0.33-0.42 of lobe length (m=0.38). (024f.jpg)
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 86: Tanypodinae 72 Xenopelopia of the Text Key.

Widespread in Europe and north Africa.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Ponds and ditches.