Spilogona gorodkovi Sorokina, 2025, sp. nov.
Creators: name: Sorokina, Vera S.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Muscidae
Spilogona
Spilogona gorodkovi

description: Spilogona gorodkovi sp. nov.
Figs 2 A–I
Type material: Holotype ♂, RUSSIA, Wrangel Island: 4 km N Somnitil’naya Bay, valley of the River Somnitil’naya, on flowers of Potentilla emarginata, 28.vii.1972, leg. K. Gorodkov (ZISP). Paratypes: RUSSIA, Wrangel Island: 2♂♂ 2♀♀, same data as holotype (SZMN); 3♀♀, 5 km N Somnitil’naya Bay, valley of the River Somnitil’naya, 150 m, 25.vii.1972, leg. K. Gorodkov (SZMN); 1♂, Somnitil’naya Bay, south of island, bank of the River Somnitil’naya, on flowers of Potentilla emarginata, 26.vii.1966, leg. K. Gorodkov (ZISP); 1♂ 1♀, Somnitil’naya Bay, south of island, tundra, on flowers of Dryas integrifolia, 19.vii.1966, leg. K. Gorodkov (ZISP); 5♀♀, 5 km N Somnitil’naya Bay, south of island, middle part of the River Somnitil’naya, Mineeva Mts, 23.vii.1971, leg. K. Gorodkov (ZISP); 1♂, 15 km W Rodzhers Bay, south of island, 18.vii.1971, leg. K. Gorodkov (ZISP).
Etymology. The species name is a patronym in honour of the celebrated Soviet dipterist Kirill B. Gorodkov (Russia), who collected the type series of this species as well many other new Muscidae.
Diagnosis. The new species is similar to Nearctic Spilogona rufitarsis (Stein, 1920) because of 4 pairs of postsutural dorsocentral setae, facial edge not projecting beyond level of profrons, broad frons, anepisternum without interspatial setae, mid tibia without v setae, hind femur with pv setae on proximal half, scutellum without downwardly-directed preapical setulae on upper border of declivities, grey abdomen with black spots and a narrow brown median stripe between them. But the new species differs from Spilogona rufitarsis by the wider frons, dusted prementum, black fore tibia and tarsi, darker colour of thorax, blackish haltere, wide parafacial which is 1.2–2.0 times width of postpedicel at level of base of antenna, and postgenital plate with spinules.
Description: Male: body 5.6–5.8 mm, wing 5.0– 5.2 mm.
Head: Ground-colour black. Frons, fronto-orbital plate, gena and parafacial shining silvery-grey, with dark reflections when viewed in profile. In lateral view, facial edge not projecting beyond level of profrons (Fig. 2A). Eye large, bare or with very sparse and inconspicuous hairs. Fronto-orbital plates separated by a wide black frontal vitta. Distance between eye margins on upper part of frons about as wide as distance between the first pair of dc setae, sometimes a little narrower. Frontal triangle small, grey dusted, not extending to middle of frons. Frons with 8–9 pairs of strong frontal setae and hair-like setae between them. Parafacial at level of base of antenna 1.2–1.3 times width of postpedicel, very weakly narrowing below. Height of gena about 1/4 of height of eye and 1.8–2 times width of postpedicel.Antenna black, postpedicel approximately 1.5 times as long as wide. Arista black, thickened at base, short pubescent, with the longest individual hairs shorter than basal diameter of arista. Palpus black. Proboscis short, thin, prementum broadly dusted in middle. Labella large.
Thorax: Ground-colour black, densely grey dusted, with three distinct brown longitudinal stripes widening diffusely to scutellum (Fig. 2B). Presutural acr setae in 2 even rows, 2+4 dc setae. Notopleuron bare, or with individual hairs in upper part. Anepisternum without interspatial setae. Katepisternal setae 1+1. Scutellum brown dusted except grey at apex, without downwardly-directed preapical setulae on upper border of declivities.
Wing: Light brownish tinged. Costa without spinules or costal spine. Calypters whitish, lower one with broadly yellow margins. Haltere brown with blackish knob.
Legs: Ground colour black, grey dusted. Fore tibia with 1 p seta. Mid femur with a row of hair-like pv and avv setae, which become more numerous and elongate towards base of pv surface, with 2 pd–p preapical setae. Mid tibia with 0–1 ad and 3 pd setae, without any v setae. Hind femur with 6–7 strong av setae in distal third and with hair-like setae at base on av-v-pv surfaces which are longer on pv surface. Hind tibia with 1–3 short av, 4–5 ad, 3–4 pd, without pv setae.
Abdomen: Black with dense grey dust, conical. Tergites 1+2–4 with black triangular spots separated by a narrow brown median stripe, tergite 5 with a diffuse brown median stripe. Sternite 1 with hairs, sternite 5 somewhat protruding, a little longer then sternite 4, with a deep median notch and a pointed caudal margin, with shining apex (Figs 2E, I).
Terminalia: In lateral view cerci wide, curved, sharply tapered towards the apex; surstylus rounded at apex, with hairs inside, not longer then cerci; epandrium large, hemispherical; hypandrium 2 times shorter then epandrium (Figs 2D, G); cercal plate triangular (Fig. 2H).
Female: body 5.8–6.5 mm, wing 5.5–5.8 mm.
Similar to male but differing as follows:
Head: Frons, fronto-orbital plate, gena and parafacial grey or brown dusted (Fig. 2C). Frontal triangle brownish dusted, extending to middle of frons. Width of frontal vitta 3–4 times width of a fronto-orbital plate. Fronto-orbital plate with 2 pairs of orbital setae. Parafacial at level of base of antenna 2 times width of postpedicel. Height of gena about 1/3 of height of eye. Proboscis thickened.
Thorax: Scutum more matt. Scutellum with brown spots on lateral angles.
Legs: Mid femur with a row of hair-like pv which become more elongate towards base; only several short av-v hairs at base. Mid tibia with 0 ad and 2–3 pd. Hind femur with 4–5 strong av setae in distal third; hair-like setae at base short and sparse on av-v surface, longer on pv surface. Hind tibia with 3–4 ad, 2–3 pd pv setae.
Abdomen: Postgenital plate with spinules and hairs (Fig. 2F).
Distribution. PALAEARCTIC: Arctic Russia (Wrangel Island).
description: Published as part of Sorokina, Vera S., 2025, New taxonomic notes on the genus Spilogona Schnabl, 1911 (Diptera: Muscidae) in Arctic Russia, with the description of three new species, pp. 1-25 in Zootaxa 5584 (1) on pages 7-9, DOI: 10.11646/zootaxa.5584.1.1, http://zenodo.org/record/14812232