Brachypogon surma Dominiak, Szadziewski & Salmela, 2020

Dominiak, Patrycja, Szadziewski, Ryszard & Salmela, Jukka, 2020, Descriptions of Brachypogon surma sp. n. from Finland and B. singularis (Santos Abreu, 1918) from the Canary Islands (Diptera, Ceratopogonidae), Norwegian Journal of Entomology 67, pp. 235-245 : 236-238

publication ID	https://doi.org/10.5281/zenodo.16006402
persistent identifier	https://treatment.plazi.org/id/1145CF55-742D-FFE2-3584-30A8FB5FFA84
treatment provided by	Felipe
scientific name	Brachypogon surma Dominiak, Szadziewski & Salmela
status

Treatment

Subgenus Isohelea Kieffer, 1917

Brachypogon surma Dominiak, Szadziewski & Salmela sp. n. ( Figures 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ) urn:lsid:zoobank.org:act:BF49B2BC-E164-4EAA-A922-8331970AEB78

Material examined. Holotype. Adult male, Finland, Keminmaa , Kallinkankaan letot, Kallinkangas, rich flark fen, Malaise 1, N65.8161 E24.5050, 27.06.– 28.07.2014, leg. J. Salmela, NVO.BRA-2020-1 ( LMM) GoogleMaps . Paratypes. Same data as the holotype, 5 males - 4 males, NVO. BRA-2020-2 - NVO.BRA-2020-5 ( LMM), 1 male ( CEIG); Finland, Lkor , Pelkosenniemi Kätkäaapa S GoogleMaps , rich spring fen, Malaise 2, N67.1014 E27.9045, 03.06– 08.07.2015, JS-sl-2015-0149, BOLD GoogleMaps : JSsl-2015-0149, 1 male, leg. J . Salmela, NVO.BRA-2020-7 ( LMM); Finland, Lkor, Pelkosenniemi, Kätkäaapa-Serrijoki, Kätkäaapa N , N67.1673 E27.8772, rich flark fen, 31.07.– 29.09.2015, leg. J GoogleMaps . Salmela , DIPT-JS-2016-0297, NVO.BRA-2020- 8 and 2016-0298, NVO.BRA-2020-9, 2 males, ( LMM); Finland, Lkor , Savukoski, Ainijärvi, rich fen, 67.7615 29.4389, 30.07.– 28.09.2015, DIPT- JS-2016-0305, 1 male, leg. J GoogleMaps . Salmela, NVO. BRA-2020-10 ( LMM).

Diagnosis. Males of the new species are distinguished by having fused and broad leaf-like parameres and aedeagus with divergent apices. Females unknown.

Description. Male. Colouration. Body uniformly dark, tarsomeres (except of hind basitarsus) slightly paler. Head. Antenna ( Figure 1a View FIGURE 1 ) with flagellomeres 2–10 or 2–11 usually fused (in some specimens flagellomeres 3–11 only partially fused); flagellum length 0.45–0.51 mm, AR 0.83–0.92 (n=6). Palpus 5-segmented ( Figure 1b View FIGURE 1 ); third palpal segment with small and shallow sensory pit located on distal half; length 0.031 – 0.040 mm, PR III 2.2–2.6 (n=6); fourth palpal segment bearing 1–2 setae. Thorax. Anepisternum bare, katepisternum with single seta; scutellum bearing 4 marginal setae. Legs slender; hind tibial comb composed of 8–9 large spines ( Figure 1c View FIGURE 1 ); hind basitarsus with single row of palisade

Norwegian Journal of Entomology 67, 235–245 (2020)

setae; hind tarsal ratio TR III 1.5–1.7 (n=7). Claws small, equal-sized, with bifid apices, each with single long seta at base, inner teeth absent. Wing membrane hyaline, without macrotrichia ( Figure 1d View FIGURE 1 ); two short and similar in length radial cells present, first one slit-like, second one - broader; wing veins pale; wing length 0.78–0.84 mm, CR 0.48–0.52 (n=6). Genitalia ( Figures 2–3 View FIGURE 2 View FIGURE 3 ). Tergite 9 tapering towards broad blunt apex, bearing a pair of small cerci, each with single strong apical seta ( Figures 2b View FIGURE 2 , 3a View FIGURE 3 ); apicolateral processes not developed; proctiger heavily sclerotized, frame-like, trapezoid-shaped ( Figures 2b View FIGURE 2 , 3a, b View FIGURE 3 ). Posterior margin of sternite 9 nearly straight ( Figures 2a View FIGURE 2 , 3a View FIGURE 3 ). Gonocoxite stout, 1.6 times longer than broad. Gonostylus ( Figures 2b View FIGURE 2 , 3a View FIGURE 3 ) 1.4 times shorter than gonocoxite, stout, evenly curved, with pointed apex. Aedeagus ( Figures 2a View FIGURE 2 , 3a, c View FIGURE 3 ) heavily sclerotized, nearly completely divided into two long lateral halves, with pointed, slightly divergent apices. Parameres ( Figures 2a View FIGURE 2 , 3a, d, e View FIGURE 3 ) very broad, leaf-like, fused in basal portion and deeply split distally.

Female and immature stages. Unknown.

Etymology. In the Finnish mythology, Surma is a name of a beast patrolling the borders of the underworld Tuonela. The name is a noun in apposition.

DNA barcoding . The paratype specimen belong to the BIN BOLD: ADD8364, shared by no other members. The nearest specimens are very distant: 30 closest sequences available at the BOLD database have similarity values between 89.74 and 87.31, being assigned to unidentified species of Brachypogon and to Brachypogon sociabilis ( Goetghebuer, 1920) .

Comments. Brachypogon surma sp. n. has unique shape of male genitalia and can’t be confused with any other Palaearctic species of Isohelea . It is close to B. (I.) sevanicus ( Remm, 1974) from Armenia in having similar male genitalia with divergent apices of aedeagus; however, the latter species has greatly reduced rod-like parameres which in the new species are large, evenly rounded and fused into a rounded leaf-like structure with a deep incision.

It is the seventh species (among the valid names) of the subgenus in the Finnish fauna ( Huldén & Huldén 2014, Salmela et al. 2015), and the second one described as new from Finland. The first species, B. aquilonalis (Clastrier) , was described in 1961, together with B. lapiae (Clastrier) and B. finniae (Clastrier) . However, the latter two names are currently treated as junior synonyms of B. incompletus (Kieffer, 1925) and B. nitidulus (Edwards, 1921) , respectively.

The new species has hitherto been collected from pristine rich fens. Rich fens are mire habitats influenced by calcareous bedrock and characterised by brown mosses (e.g. Scorpidium , Hamatocaulis , Meesia spp. ), not by regular peat mosses ( Sphagnum ). Such habitats are mostly converted to agricultural land or ditched in southern Finland and in SW Lapland. Rich fens are threatened habitats in Finland and harbour rich plant and invertebrate biota ( Salmela & Suuronen 2014, Salmela et al. 2015, Hyvärinen et al. 2019).