Tanytarsus fimbriatus

Author: Reiss and Fittkau, 1971

Diagnosis (n=1)
Exuviae 3.5mm long.
Cephalothorax: Cephalic tubercles with a broad base and an elongate conical apex; apex 27µm long, 8µm wide. Frontal setae 95µm long. Antennal sheath base with a conical projection bearing an apical tooth (140f.jpg). Thoracic horn 480µm long; ThR 16. Thoracic horn with sparse setae over the middle half, setae 60µm long, the setae longer than the horn is wide (140e.jpg). Posterior thoracic mound weak. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.26x width tergite; hooks 93. Point patches of tergite III-VI longitudinally broad oval, of points only; on III less than one quarter the length of the segment (140d.jpg). Armament tergite IV strong, 95µm long. ArR III-VI 0.68 : 1.0 : 0.89 : 0.84. Postero-lateral comb of segment VIII broad, about 50µm wide. Lateral taeniae of segments V-VIII: 0,0,4,4.
Anal segment: Anal lobes with a relatively high number of taeniae (46/43), fringe forming a complete series.
(Linked adult male: Langton and Pinder, 2003a)

Note: Very similar to Tanytarsus mendax Kieffer; most easily distinguished by the 4 lateral taeniae of segment VIII. Other differences: posterior points of tergite II (very small in fimbriatus, sturdy and about as large as the anterior points of that tergite in mendax); and shagreen of sternite I (composed of short spinules in fimbriatus, elongate in mendax).

Species keys out at Page 461: Tanytarsini 102 Tanytarsus of the Text Key.

Holarctic species: widespread in Europe, circum-Mediterranean.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Standing water.