Chironomus striatus

Author: Strenzke, 1959

Diagnosis (n=1, specimen ex. coll. C. Webb in coll. R.S. Wilson)
Exuviae 9.7mm long.
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 125x150µm. Frontal setae robust, about 3µm wide. Thoracic horn much branched; basal ring of horn 150x60µm; tracheal patch 110x35µm; 9-12 tracheoles across; tracheoles 3µm in diameter. Tracheal patch of thoracic horn without an "eye". Thorax smooth, or clearly granulate anteriorly only, without large granules near suture.
Abdomen: Hook row II entire; hooks 102. Armament of tergites II-VI in the form of an undivided, somewhat reduced patch of strong points, the points in each segment increasing in size posteriorly. Points of tergites III-VI gradually larger over posterior half of tergite. Points of tergite VIII mainly isolated and irregularly arranged. 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. Seta D4 of tergite VI closer to mid-line than seta D3. Sternite III with a much reduced lateral longitudinal shagreen band; sternite IV without such bands. Parasternite II obviously shagreened; III without shagreen; IV may have a few minute points in posterior half. Pleura IV sparsely spinulate or extensively armed with relatively large spinules: about 20µm long, 1µm broad at base. Conjunctives IV/V and V/VI armed with points or spinulate points. Comb of segment VIII with 3, 4 stout teeth, set on the end of an elongate ventral cuticular mound which exceeds appreciably the apico-lateral corner of the segment. Lateral taeniae of segments V-VIII: 4,4,4,5.
Anal segment: Anal lobes weakly rounded. Anal lobe with 86 fringe taeniae.

Species keys out at Page 188: Chironomini 85 Chironomus of the Text Key.

(N)W Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Clay pool.