Wiedemannia rudolfi Wagner & Ivkovic 2022, sp. nov.

Wiedemannia rudolfi Wagner & Ivković sp. nov. (Fig. 10a–d) Type material. HOLOTYPE ♁ (specimen slide mounted by F. Vaillant) (Fig. 10a): Labels on upperside of slide— label 1: Wiedemannia (Chamaedipsia) alpina Engel ♁ (ink) / Tête prof. (pencil) / det. F. Vaillant (ink); label 2: GBIFCH 00596430 (printed); label 3: Račkova valley, West Tatra, Tschechoslovakia, 1700 m 8.VI.1970, coll. R. Rozkošny (MZLS). On underside of slide is one red label (Fig. 10b): Wiedemannia rudolfi n. sp. Wagner, Ivković 2022; and a second red label: holotype, to this a white label with red dot is glued: holotype MZL 2021. Description. Male. Head brownish, antennae and mouthparts dark brown; gena about 0.2 of eye diameter. Body length 5.7 mm (slide mounted specimen). Mesonotum with 5–6 pairs of dorsocentral setae, with only a few short setulae interspersed. Acrostichal setae half-length of dorsocentrals, distributed along entire mesonotum. Legs dark brown covered with dark setae; all coxae with longer anterior setae. Front tibia with 2 strong setae on distal third and 2 more of similar size apically. Wing membrane slightly infuscate, pterostigma elongate, brown. Cell dm elongate, protruded. M 1 and M 2 originating together at crossvein m-m. Wing length 4.2 mm. Abdomen with tergites 6–8 covered with curled setae. Terminalia (Fig. 10c, d): hypandrium smaller than epandrium. Epandrium oval approximately two times longer than wide, with a few long setae; surstylus small. Clasping cercus with three lobes: anterior lobe pale, middle and posterior lobes dark; anterior lobe with short setae along basal edge, apical setae longer than apical diameter of lobe; inner surface of anterior lobe with few setae, middle lobe apically with strong setae from apex to base, posterior lobe with long setae, extending to base of middle lobe and covering basal and apical areas of clasping cercus. Basal part of clasping cercus covered with short setae. Phallus linear, slender; flagellum linear, without median swelling. Female. Unknown Etymology. The species is named in honour of the Czech entomologist, Rudolf Rozkošný, the collector of the specimen. Remarks. The holotype is part of the slide collection of F. Vaillant deposited in MZLS. The specimen had been determined as Wiedemannia alpina Engel, but the shape of the terminalia clearly distinguishes both species. Besides the similarity of the clasping cercus, the close relationship of W. alpina and W. rudolfi sp. nov. is evident also by the long, curled setae on abdominal tergites 6–8 in both species.Published as part of Wagner, Rüdiger, Plant, Adrian, Ivković, Marija & Gattolliat, Jean-Luc, 2022, New synonyms and new species of European aquatic dance flies (Diptera, Empididae), pp. 427-442 in Zootaxa 5222 (5) on page 440, DOI: 10.11646/zootaxa.5222.5.2, http://zenodo.org/record/747181