Chironomus jonmartini

Author: Lindeberg, 1979

Diagnosis (material leg. Hirvenoja.)
Exuviae 7.6-9.4mm long (n=4).
Colour: 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 LxB 70x44-160x130µm (n=4). Frontal setae 34-72µm long (n=4). Basal ring of thoracic horn 125x50-160x60µm; tracheolar patch 82x18-120x30µm (n=4); 15, 17 tracheoles across (n=2); 2µm in diameter. Tracheolar patch of thoracic horn without an "eye"; tracheoles narrow. Thorax extensively granulate.
Abdomen: Hook row II entire, length of row 0.46x width tergite (n=1); hooks 70 (n=1). Armament of tergites II-VI not so strongly waisted and with the posterior transverse band not successively increasing in extent to tergite VI; usually reduced on VI. Anterolateral points of tergites IV-VI progressively more arranged in distinct transverse rows. Sternites III and IV with lateral shagreen bands broadly joined anteriorly (the lateral bands may be reduced on IV). Pleura of segment IV spinulate. Comb of segment VIII with 1-5 stout teeth which may be long apiculate, 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 lobe with 75-130 fringe taeniae (n=4).

Species keys out at Page 175: Chironomini 72 Chironomus of the Text Key.

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

Ecological notes
Gulf of Finland archipelago, more or less saline rock pools.