Thienemanniella Kieffer, 1911

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 : 244

Thienemanniella Kieffer ( Fig. 68 )

Head capsule yellow to brown, occipital margin dark brown. Compared with other orthoclads (with exception of Corynoneura ), head capsule is prolonged in shape and very small, easy to overlook. Antenna at least 1/2 but no more than 3/4 length of head; 5-segmented; segment 3 is frequently darkened. Premandible with one apical tooth. Mandible with 4 inner teeth, first one can be longer than apical tooth. Mentum with three subequal median teeth (exceptionally with two) clearly above the 5 pairs of subequal lateral teeth.

Remarks: Thienemaniella resembles Corynoneura , which also has a narrow, triangular mentum with three prominent median teeth and long antennae, however, in case of Thienemaniella antenna is shorter than head and with 5 segments. Antennae are often missing in subfossils, but the head capsule is usually darker and always without net-like reticulation on the surface (note that in some Corynoneura species/ types reticulation may be indistinct, too).

Head capsule remains were found in low abundance in several lakes located at lower altitudes. One morphotype was identified following Brooks et al. (2007).

Figures

FIGURES 66–71. Synorthocladius: 66—head capsule, A—detail of mentum. Synorthocladius: 67—mandible (arrow indicates spine). Thienemanniella clavicornis-type: 68—head capsule. Tvetenia bavarica-type: 69—head capsule (arrow indicates seta submenti). Zalutschia mucronata-type: 70—head capsule, A—antenna, blade longer than flagellum. Zalutschia type B: 71—head capsule.