Pseudokiefferiella parva (Edwards, 1932)

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 : 225

Pseudokiefferiella parva (Edwards, 1932) ( Fig. 22 )

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

Head capsule dark-brown. Mentum striped, with one median tooth and 7 pairs of lateral teeth. Median tooth is subequal to first lateral tooth in size, second lateral tooth is obviously smaller and fused to the first lateral. There is a distinct space between the lighter second and darker third laterals; third to seventh laterals are darker and create a distinct cluster. Ventromental plates are small. Setae submenti situated below bases of mentum. First inner tooth of mandible is as long as apical tooth.

Remarks: Larvae of Pseudokiefferiella are similar to Diamesa and reliable diagnose is based on larval body. Comparing subfossil heads with recent larval material, we suggest that remains of both genera are distinguishable by shape and coloration of mentum.

Subfossil remains were recorded in small number of studied lakes. P. parva (Edwards, 1932) belongs to inhabitants of cold alpine streams and lake inlets and outlets in the Tatra Mts. ( Novikmec et al. 2015).

Figures

FIGURES 15–22. Pseudodiamesa branickii-type: 15— mandible (arrow indicates branches of seta interna). P. branickii-type: 16—detail of pecten epipharyngis and premandible (arrows indicate seven scales of pecten epipharyngis and 8–9 teeth of the premandible). Pseudodiamesa nivosa-type: 17—head capsule, A—antenna. P. nivosa-type: 18—mandible (arrow indicates branches of seta interna). P. nivosa-type: 19—detail of pecten epipharyngis and premandible (arrows indicate premandible teeth, SI setae and detail of labral lamellae). Pseudodiamesa: 20—young instar head capsule. Pseudodiamesa: 21—detail of mentum. Pseudokiefferiella parva: 22—head capsule.