Stictochironomus Kieffer, 1919

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 : 254-255

Stictochironomus Kieffer ( Fig. 92 )

Head capsule medium to large, yellow, posteriorly may be darkly pigmented, and dorsally may be distinct brown areas. Occipital margin mostly dark brown. Antenna 6-segmented, Lauterborn organs alternate on segment 2 and 3. Premandible with 2 apical teeth and broad basal tooth. Mandible basally broad and very slender distally, with 1 dorsal tooth and 2 inner teeth, all mandibular teeth dark. Mentum with 4 median teeth delineated from lateral regions; central pair of median teeth lower and slender than outer pair; 6 pairs of lateral teeth; all teeth dark. Ventromental plates slightly wider than mentum, weakly curved, striations often indistinct, broad grey band on anterior margin.

Remarks: The shape of mentum with delineated ventromentum resembles some other genera (see comments to Phaenopsectra ). However, the central pair of median teeth is thinner in Stictochironomus . Moreover, the 6-segmented antenna with alternate Lauterborn organs, 2 inner mandibular teeth and the grey band on the anterior margin on ventromental plates are also distinctive.

Immature stages of Stictochironomus were recorded from the Tatra Mts. lakes rarely ( Bitušík 2004). Three subfossil remains of the same morphotype were found in one of the studied lakes.

Figures

FIGURES 91–92. Sergentia coracina-type: 91—head capsule, A—paired striations on the ventromental plate. Stictochironomus type B: 92—head capsule.