Chironomus tuvanicus

Author: Kiknadze, Siirin and Wülker, 1992

Diagnosis (Reared material from M. Siirin.)
Exuviae 8.9-10.2mm long (n=6).
Colour: Exuviae golden-brown to dark brown. Contrast in colour between thorax and abdomen not so strongly marked: specimens dark anteriorly also have the abdomen infuscated; outer margin of the anal lobes coloured except at base.
Cephalothorax: Cephalic tubercles conical, LxB 136x112-210x160µm (n=3). Frontal setae 44-62µm long (n=4). Basal ring of thoracic horn 152x80-160x90µm. Tracheolar patch of thoracic horn without an "eye", patch 105x30-112x25µm (n=5); 10-14 tracheoles across; 2.5-2.8µm in diameter. Thorax less distinctly granulate: anteriorly the granules are small and distinct; medially most of the granules are somewhat flattened, producing an irregular reticulate pattern, or evanescent.
Abdomen: Hook row II entire, length of row 0.56, 0.64x width tergite (n=2); hooks 113, 131(n=2). Armament of tergites reduced, e.g. on tergite III extending laterally at most only as far as the inner edge of the lateral of the anterior adhesion marks and setae D4. Armament of tergites II-VI not strongly waisted and with the posterior transverse band not successively increasing in extent to tergite VI; usually reduced on VI. Shagreen of sternite II continuous from postero-lateral corner to seta V5, the region between containing points of similar size to those on each side. Parasternite II obviously shagreened. Pleura of segment IV spinulate. Comb of segment VIII with 1-5 (n=6), set on the end of an elongate ventral cuticular mound which exceeds appreciably the apico-lateral corner of the segment. Lateral setae short: on IV longest seta about 120µm long, on V longest taenia about 350µm long. Segment VIII with 5 lateral taeniae.
Anal segment: Anal lobe with 58-107 fringe taeniae (n=5).

Species keys out at Page 201: Chironomini 98 Chironomus of the Text Key.

Palaearctic species: Russian Federation.
(For more information see module IdentifyIt – file: Chironominae).