Form described by Langton, 1991
Diagnosis (n=2)
Exuviae 8.5, 9.0mm long.
Colour: Similar in colour to Chironomus montuosus from which it can be distinguished by the weaker granulation of the thorax, which, above the dorsocentral setae particularly towards the suture, is reduced to irregular vertical creases. (See also comment on Chironomus storai.)
Cephalothorax: Cephalic tubercles conical, 115, 120µm high. Frontal setae 45, 50µm long. Thoracic horn much branched.
Abdomen: Hook row II medially interrupted, length of row 0.21 (0.06 gap) 0.21x width tergite; hooks 35/41, 39/36. Armament of tergites II-VI in the form of an undivided, usually extensive patch of strong points, the points in each segment increasing in size posteriorly. Armament of tergite II spreading laterally in front of the anterior adhesion marks. Armament of tergite IV with marmoration restricted to the lateral margin of the point patch, points usually reaching as far laterally as seta D2. Anterior points of tergite VI arranged in short rows which are them-selves aligned in distinct horizontal rows that continue across the tergite (101h.jpg). Anterior points of sternite VII spiculate and grouped in irregular rows; those of the tergite more robust, resembling in shape the smaller points on the preceding tergite. On tergite VII the short rows of points continue posteriorly to the level of the anterior adhesion marks. Pedes spurii B of segment II conspicuous. Pleura IV unarmed. Conjunctives III/IV and IV/V with a small lateral seta, V/VI and VI/VII unarmed or very weakly armed. Comb of segment VIII with 1-4 dark apical teeth. Lateral taeniae of segments V-VIII: 4,4,4,5.
Anal segment: Fringe of anal lobe with 72-99 taeniae.
Form keys out at Page 146: Chironomini 43 Chironomus of the Text Key.
Distribution
Fennoscandia.
(For more information see module IdentifyIt – file: Chironominae).
Ecological notes
Middle Finland and Sweden.