Tanytarsus chinyensis

Author: Goetghebuer, 1934

Exuviae 3.8-4.7mm long (m=4.3mm, n=22) (141-1.jpg).
Cephalothorax: Cephalic tubercles very shallow conical. Frontal setae 87-118µm long (m=105µm, n=11). Antennal sheath bases with small rounded-conical swellings. Thoracic horn 603-810µm long (m=697µm, n=23), with minute setulae, 8µm long, on the apical three-quarters; ThR 11.8-17.4 (m=13.7, n=12). Posterior thoracic mound weak. Thoracic horn at most with minute setulae. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.39, 0.42x width tergite (n=2); hooks 67-90 (n=5). Point bands of tergites III-VI usually set on conspicuously blackened patches (141c.jpg). Point patches of tergite III of points only, patches longitudinally broad oval, less than one quarter the length of the segment. Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 63-88µm long (m=79µm, n=23). ArR III-VI 0.80-1.0 : 1.0 : 0.70-1.1 : 0.4-0.75 (n=23). Postero-lateral comb of segment VIII unusual for Tanytarsus, narrow, 14-20µm wide (m=16.6µm, n=21), tapering apically, of short, imbricating and overlapping teeth (141e.jpg). Lateral taeniae of segments V-VIII: 3,3,4,4.
Anal segment: Fringe of anal lobe with 26-38 taeniae (m=31.9, n=22), forming a complete series. Anal lobe ratio 1.09-1.30 (n=6).
(Linked adult male: Langton and Pinder, 2003a)

Note: Tanytarsus cretensis is very similar in general appearance. However, it has a more typical comb of segment VIII, though it appears on the two examples seen that it is often twisted vertically, giving a superficial resemblance to that of chinyensis; the sharper teeth and the restricted spread of teeth anteriorly will resolve. Moreover, in cretensis the thoracic horn is narrower: usually well over 16x as long as broad.

Species keys out at Page 462: Tanytarsini 103 Tanytarsus of the Text Key.

Widespread in (N+W+C) Europe, north Africa, Canary Islands.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes