Zavrelia pentatoma

Author: Kieffer, 1913

Exuviae 2.5-2.9mm long (n=9).
Cephalothorax: Cephalic tubercles very shallow; 17µm long (n=1). Frontal setae taeniate, 120-135µm long (n=4). Antennal sheath bases with a rounded-conical transparent projection. Thoracic horn 345-470µm long (m=427µm, n=5), minutely setulated apically (128i.jpg); ThR 13.8-23.5 (m=19.3, n=4).
Abdomen: Hook row II 0.33, 0.38x width tergite; hooks 60-71 (n=5) (128j.jpg). Armament of tergite II as extensive as on tergite III, extending beyond seta D1 anteriorly. Tergites III-VI with a median and posterior patch of points on each side of the mid-line, which may be sufficiently extensive to form a single large continuous patch. Small pedes spurii B present on segment II (pleura of this segment unarmed). Postero-lateral corners of segment VIII with a large spur. Lateral taeniae of segments V-VIII: 3,4,4,(3)4.
Anal segment: Anal lobe ratio 1.0-1.4 (n=3). Fringe of anal lobe with 14-19 taeniae (n=15).
(Linked adult male: Langton and Pinder, 2003a)

Note: Stempellinella flavidula is very similar but it can be distinguished from Z. pentatoma by the strong (20µm long) colourless teeth in the middle of the thoracic horn continued in diminishing size to apex, the less extensive armament on tergite II, 3 lateral taeniae on segment VIII and fewer hooks in hook row II.

Species keys out at Page 371: Tanytarsini 14 Zavrelia of the Text Key.

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

Ecological notes
Pools and ditches.