Rossaro B. 2022. Description of some West-Palearctic species of Eukiefferiella Thienemann, Tvetenia Kieffer and Tokunagaia Saether (Diptera, Chironomidae) // Euroasian Entomological Journal. Vol.21. Suppl.1: 48–67 [in English].
Universitа degli Studi di Milano, via Celoria 26 I, Milano 20133 Italia. E-mail: bruno.rossaro@unimi.it
doi 10.15298/euroasentj.21.Spl.1.06
ABSTRACT. West Palaearctic larvae of the genera Eukiefferiella Thienemann, 1926, Tokunagaia Saether, 1973 and Tvetenia Kieffer, 1922 are redescribed and a key to species is provided. The three genera are recognized by the following characters of larva: head and body colour, head capsule shape, number and length of segments of antenna, labrum with simple or branched setae anteriores SI, simple or bifid setae anteriores SIII, mandible with mola provided with spines or bristles, presence of long setae on body segments, developed procerci with a long subapical seta. The shape of mentum is a useful character with a single or a bifid, large or narrow median tooth and 4 or 5 lateral teeth, but often the teeth are worn out and their shape must be used with caution. Number and length of antennal segments, antennal blade and distal setal mark position are other diagnostic characters; the third antennal segment may be reduced to completely disappeared. Species live in different types of running waters, from glacial streams to lowland large rivers, their different ecology can aid in species identification.
KEY WORDS: Diptera, Chironomidae, Orthocladiinae, taxonomy, redescription, key, autoecology.