Form described by Langton, 1991
Diagnosis
Exuviae 2.1-2.3mm long (n=3).
Cephalothorax: Cephalic tubercles short conical, 20µm high (n=1). Frontal setae taeniate, 118µm long (n=1). Thoracic horn 350-375µm long, with a few sturdy points scattered over the apical two-thirds (129g.jpg); ThR 15.9-17.6 (n=3).
Abdomen: Hook row II with 20-25 hooks (n=3). Small pedes spurii B present on segment II (pleura of this segment unarmed). 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. Postero-lateral corners of segment VIII with a large spur. Lateral taeniae of segments V-VIII: 3,4,4,3.
Anal segment: Anal lobe ratio 1.1, 1.2 (n=2). Fringe of anal lobe with 14-20 taeniae (n=3).
Note: This could be a Stempellinella, there being no characteristic for distinguishing these two genera on pupal structure. Very similar to Stempellinella flavidula from which it can be distinguished by the more extensive armament on tergite II and fewer hooks in the hook row.
Form keys out at Page 372: Tanytarsini 15 ? Zavrelia of the Text Key.
Distribution
France.
(For more information see module IdentifyIt – file: Chironominae).