Medetera fennoscandica Grichanov, 2024

23. Medetera fennoscandica Grichanov View in CoL , sp. nov. Figs. 5–6

https://zoobank.org/ NomenclaturalActs/66593ACB-5F05-4DFC-B677-

DA1934A096AA

Medetera belgica Parent, 1936 View in CoL : ( Negrobov 1971: 43; Negrobov, Stackelberg 1972: 287, figs 418–420; Negrobov, Naglis 2016: 337, fig. 10) (misidentification).

Differential diagnosis. This species differs from the Belgian M. belgica described from a female by brown tibiae, yellow knees and mostly yellow basitarsi on all legs (Fig. 5), as well as by pale brownish cilia on calypters in contrast to entirely black legs and black cilia on calypters in M. belgica ( Parent 1936; 1938; Negrobov, Stackelberg 1972). In addition, the hind basitarsus of the latter species was originally described as 4/5 as long as the next segment, but it is 2/3 as long as the next segment in M. fennoscandica sp. nov.; maximal distance between R 2+3 and M 1+2 wing veins is 1.5 times as long as costal section between these veins in M. fennoscandica sp. nov. and two times as long as costal section in M. belgica ; posterior cross-vein dm-m is 1/2 as long as distal part of M 4 in M. fennoscandica sp. nov. and 2/ 3 in M. belgica (Fig. 6). The overall habitus of the new species is almost identical to that in M. muralis Meigen, 1824 and three other species of the Medetera muralis group, but the shape of phallus in males of five species from this group is species-specific, and they can be distinguished by the use of the available key and figures ( Negrobov, Naglis 2016: figs 9-13). In M. fennoscandica sp. nov., the tibiae are usually dark; the short apical projection of phallus has acute apex and mid-dorsal tooth; the dorsal lobe of surstylus is strongly curved; the cercus has three apical projections. Further details of the morphology can be found in description and illustrations of ‘ M. belgica ’ (nec Parent) ( Negrobov, Stackelberg 1972).

Etymology. The species name belongs to the geographical region in Europe, Fennoscandia, which comes from the Latin words Fennia ( Finland) and Scandia (Scandinavia).

Type material. Holotype ♂, Russia: Murmansk Region, Lim : 68.06°N, 32.59°E, Lapland N. R., Krasnaya Lambina [ranger station], Malaise trap, 22.06 – 20.07.2017, A. Polevoi leg. [ ZIN] GoogleMaps . Paratypes: 1♂, same label as for holotype [ ZIN] ; 1♂, Russia: White Sea , Kandalaksha Bay , [Kandalaksha] Nature Reserve, Ryazhkov Island, littoral, 19.07.1963, Negrobov leg. [in Russian, ZIN] .

Additional material. 1♂, Russia: White Sea , Kandalaksha Bay , [Kandalaksha] Nature Reserve, Ryazhkov Island, littoral, on stones, 19.07.1963, Negrobov leg. [in Russian, VSU] .

Remarks. Males from the Laplandskii Nature Reserve with terminalia dissected and stored in glycerin in microvials pinned with the specimens. One paratype from Kandalaksha [ZIN] with apex of hypopygium dissected and lost. Another male from Kandalaksha [VSU] without antennae, wings and legs, but with terminalia dissected and stored in a microvial pinned separately [Olga Selivanova, VSU, personal communication].

Distribution. Type locality: Russia, Murmansk Region, Laplandskii Nature Reserve, Krasnaya Lambina ranger station. ‘ Medetera belgica ’ ( Negrobov, Stackelberg 1972) was reported from Finland, Norway and Sweden ( Jonassen et al. 2013; Kahanpää 2014; Persson et al. 2019). It was also recorded recently from Belgium, Czechia, Germany, Italy, Romania, Slovakia, and even from Iran ( Oboňa, Pollet 2022; Grichanov, Gilasian 2023; Kejval, Pollet 2023), often without comments and always without description of species-specific characters listed above for the true M. belgica . Notes. It was supposed ( Negrobov, Naglis 2016) that the ‘ M. belgica ’ male from Murmansk Region described and figured earlier (Stackelberg, Negrobov 1972) may represent a different species. The M. belgica female as originally described ( Parent 1936) keys out to M. incisa Negrobov, 1972 from the Russian Far East ( Negrobov, Naglis 2016), which was never reported again after description. ‘ Medetera belgica ’ and M. muralis are sympatric species in Norway ( Jonassen et al. 2013), with the former becoming more widespread than the latter towards the north. Much more material has been listed for ‘ M. belgica ’, than for M. muralis from Czechia ( Kejval, Pollet 2023). According to these authors, ‘ M. belgica ’ occurs predominantly on trunks of various trees, but also on boulders and rocky outcrops in forest habitats, on walls of buildings. Medetera muralis has been reported from many countries of Europe, Middle East and the Caucasus, but the old records of this species may belong to M. fennoscandica sp. nov. or other species from this group: Medetera kowarzi Negrobov, 1972 , was found in the Alps of Austria, France and Switzerland; Medetera miki Negrobov, 1972 , is known only from the holotype collected in 1875 from Hammern locality at the Czech-Austrian border; Medetera peloria Negrobov, 1967 , widespread in the Caucasus, is also reported from Portugal. In the Laplandskii Nature Reserve, M. fennoscandica sp. nov. was collected by Malaise trap in wetland pine forest (Fig. 4).

24. * Medetera dichrocera Kowarz, 1878

Material. 1♂, Vtoroi Ruchei, 23.07– 2.08.2013, A. Polevoi.

Comments. Collected with Malaise trap in old growth coniferous forest along the river. Trans-Palaearctic species.

25. * Medetera infumata Loew, 1857

Material. 2♂, Krasnaya Lambina, 22.06– 20.07.2017, A. Polevoi; 3♂, Chunozero, 23.06– 28.07.2014, A. Polevoi.

Comments. Collected with Malaise traps in pine forests. Trans-Palaearctic species.

26. * Medetera jugalis Collin, 1941

Material. 2♂, Chunozero, 28.07– 26.08.2014, A. Polevoi.

Comments. Collected with Malaise traps in Vaccinium vitis-idaea pine forest (Fig. 7). Euro-Siberian species. For the first time record- ed from the European part of Russia.

26. * Medetera tristis (Zetterstedt, 1838)

Material. 1♂, Krasnaya Lambina, 22.06– 20.07.2017, A. Polevoi.

Comments. Collected with Malaise trap in wetland pine forest (Fig. 4). Trans-Palaearctic species.