Demicryptochironomus pe2

Form described by Langton, 1991

Diagnosis (n=2)
Exuviae 4.5, 4.7mm long.
Cephalothorax: Cephalic tubercles 40, 55µm long, tubercles hemispherically swollen at base with a short conical apex (098g.jpg). Frontal setae 10, 15µm long.
Abdomen: Hook row II entire, length of row 0.47, 0.52x width tergite; hooks 82, 90. Tergite II posteriorly with a transverse band of points medially broken by a narrow point-free space; III-V with the longitudinal patches more extensive, but always separate posteriorly. Tergites IV-VI with antero-median point patches, patches broadly joined to the posterior patches. Posterior points of tergites II and III large, crowded and dark, producing obvious transverse brown bands on the exuviae. Pedes spurii B of segment II present. Comb of segment VIII with one tooth. Lateral taeniae of segments V-VIII: 4,4,4,5.
Anal segment: Fringe of anal lobe with 53/54 taeniae.

Note: Demicryptochironomus neglectus and this form are very similar, the differences being of degree and slight. They are also based on one and two specimens respectively. On present material it seems more likely that they belong to the same species, despite their geographical origin.

Form keys out at Page 132: Chironomini 29 Demicryptochironomus of the Text Key.

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

Ecological notes
A river.