Corynoneura Winertz, 1846

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 : 230-232

Corynoneura Winertz, 1846 ( Figs 32–34 )

Head capsule very small (thus easy to overlook), narrow and yellow, often sculpturing on surface. Occipital margin pale to black. Antennae 4 segmented, subequal or longer than head, second and third segments are frequently darkened. Premandible with up to 12 minute teeth. Apical mandibular tooth smaller than any of 4 inner teeth. Mentum with 2–3 median teeth and 5 pairs of lateral teeth. Ventromental plates narrow.

Remarks: The unique feature of the genus is the extremely long 4 segmented antenna (often broken off in the subfossil material). Thienemanniella has similar shape of mentum but the 5-segmented antenna is shorter than head, third segment is shorter than second (while longer than second in Corynoneura ); moreover, the head capsule is often pigmented (while usually pale in Corynoneura ) without reticulation.

Two species, Corynoneura scutellata Winnertz, 1846 and C. lobata Edwards, 1924 were confirmed from the Tatra Mts. lakes ( Bitušík 2004).

Corynoneura remains were found in lakes covering a broad altitudinal range, missing only in the uppermost Tatra Mts. lakes ( Hamerlík et al. 2017). Three morphotypes were distinguished following Brooks et al. (2007).

Figures

FIGURES 32–36. Corynoneura arctica-type: 32—head capsule (arrow indicates net-like reticulation). Corynoneura edwardsi- type: 33—head capsule. Corynoneura lobata-type: 34—head capsule (arrow indicates wrinkled sculpturing). Cricotopus intersectus-type: 35—head capsule. Cricotopus (Isocladius) sylvestris-type: 36—head capsule.