Cryptochironomus defectus

Author: (Kieffer, 1913)

Diagnosis (material leg. E. Morozova, H. Vallenduuk.)
Exuviae 6.9-10.1mm long (m=7.95, n=8).
Cephalothorax: Cephalic tubercles 200-400µm long (m=250µm, n=8), length 2.75-4.3x breadth (n=4). Frontal setae 20-44µm long (n=6). Granulation of antepronotal region of thorax of small distinct granules (8µm or less across). Dorsal anterior thoracic mound absent.
Abdomen: Length hook row II 0.30– 0.35 (0.03-0.09 gap) 0.28-0.35x width of tergite (m=0.32 (0.06) 0.32x, n=8). Dorsal posterior points of segments III-VII: 33-78, 34-68, 33-75, 31-60, 12-46 (m=50.5, 52.7, 54.8, 48.1, 35.4, n=8); ventral posterior point of segments III-VII: 5-29, 0-25, 0-23, 0-17, 0-20 (m=29.4, 7.4, 8.8, 4.6, 8, n=8). Pedes spurii B of segment II well-developed (sometimes obscured by squashing on slide). Lateral taeniae of segments V-VIII: 4,4,4,5(4).
Anal segment: Fringe of anal lobe with 62-88 taeniae (m=70.6, n=8).
(Linked adult male: Shilova, 1966a)

Species keys out at Page 354: Chironomini 251 Cryptochironomus of the Text Key.

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

Ecological notes
Stagnant water.