Diamesa, Meigen, 1835

Chamutiová, Tímea, Hamerlík, Ladislav & Bitušík, Peter, 2020, Subfossil chironomids (Diptera, Chironomidae) of lakes in the Tatra Mountains an illustrated guide, Zootaxa 4819 (2), pp. 216-264 : 221

Diamesa Tatra-type A ( Figs 10, 11 )

This is a new morphotype, not listed in Brooks et al. (2007).

Head capsule brown, area around genal setae with two obvious lighter spots. Mentum striped, with a notched median tooth and 9 pairs of lateral teeth. Median tooth is wider than first lateral, and first lateral tooth is obviously larger than second lateral. Remaining laterals are gradually decreasing. First inner tooth of mandible is as long, or longer (and more robust) than apical tooth ( Fig. 10A ). Ventromental plates clearly expanded laterally. Setae submenti arising posteriorly to the base of mentum ( Fig. 11 ).

Figures

FIGURES 9–14. Diamesa bertrami-type: 9—head capsule, A—mandible. Diamesa Tatra-type A: 10—head capsule, A—mandible. Diamesa Tatra-type A: 11—mentum (arrow indicates position of seta submenti). Diamesa Tatra-type B: 12—head capsule (arrows indicate mandible and genal setae). Diamesa Tatra-type B: 13—mentum (arrow indicates position of seta submenti). Pseudodiamesa branickii-type: 14—head capsule (arrow indicates antenna).