Rhamphomyia (Pararhamphomyia) submacrura Shamshev & Sinclair, 2020

Shamshev, Igor V., Sinclair, Bradley J. & Khruleva, Olga A., 2020, The empidoid flies (Diptera: Empidoidea, exclusive of Dolichopodidae) of the Russian Arctic islands and Svalbard Archipelago, Zootaxa 4848 (1), pp. 1-75 : 41-43

Rhamphomyia (Pararhamphomyia) submacrura Shamshev & Sinclair sp. nov.

( Figs 43, 44 )

urn:lsid:zoobank.org:act:6D5C99D5-DC42-4972-857E-D9A31B87234A

Type material. HOLOTYPE ♂, labelled: [ RUSSIA: Chukotka AO ( Wrangel Island )] “Somnitelnaya Bay,/ south o. [= ostrov, island] Wrangel/ Gorodkov 20.vii.[1]966”; “ 400 m / Mineev Mountains, S g. [= gora, mountain] Sovetskaya”; “ Holotypus / Rhamphomyia / submacrura / Shamshev, Sinclair sp. n. [red label]” (INS_DIP_0000615, ZIN; terminalia dissected, in microvial pinned with specimen).

Diagnosis. Rather large brownish grey species of the R. pusilla group with long, slender legs, curiously long epandrium and, especially, phallus; presutural dc setae multiserial, halter brownish; hind tibia and basitarsus only slightly thickened; phallus extremely long, hair-like.

Description. Male ( Fig. 43 ). Wing length 6.7 mm, body length about 6.5 mm.

Head with brownish grey pruinescence on face, frons, postgena, ocellar triangle and occiput; dark setose. Eyes holoptic, touching on frons. Ocellar triangle with several long fine setae. Occiput with numerous uniformly long thin setae, including postoculars. Antenna blackish brown; scape and pedicel short, scape slightly longer, both with short setulae; postpedicel conical, 3X longer than wide; stylus short, slightly shorter than postpedicel basal width. Palpus dark; with numerous long, dark fine setae. Labrum nearly of head height.

Thorax densely brownish grey pruinescent; with black setation; scutum uniformly brownish pruinescent, without vittae. Proepisternum with tuft of several long fine setae on lower section; upper proepisternum in front of spiracle without setae. Prosternum bare. Antepronotum with numerous fine setae shorter dorsally and longer laterally. Postpronotal seta hardly distinguishable; postpronotal lobe with numerous setae of different lengths and robustness (1–2 long setae slightly stronger). Mesonotal setation: presutural supra-alar space covered with fine mostly short setae (1–2 setae longer), 4 npl (with numerous shorter and finer setae anteriorly), 1 sut spal (with several shorter setae anteriorly), 2 pal, 14 sctl; acr short fine, arranged in 2–3 irregular rows, lacking on prescutellar depression; presutural dc longer than acr, multiserial, not separated by bare space from supra-alars, postsutural dc arranged in 2–3 irregular rows, several prescutellars longest. Laterotergite with numerous long fine setae. Anterior and posterior spiracles brown.

Legs long, slender, uniformly brownish, subshiny, black setose. Hind tibia somewhat evenly thickened toward apex; hind basitarsus slightly thickened but somewhat narrower that hind tibia at apex, cylindrical, 1.7X shorter than hind tibia. Fore coxa with numerous long simple setae anteriorly. Femora whitish pilose ventrally. Fore femur with rows of fine moderately long anteroventral and posteroventral setae. Mid femur with numerous short strong setae ventrally. Hind femur with row of anteroventral setae, row with short, fine setae on basal half but longer and stronger setae on apical half; spinule-like ventral setae on basal part. Fore tibia with numerous long, quite strong setae posterodorsally and posteriorly (longest setae nearly 1.5X tibia width). Mid tibia with several moderately long anteroventral and posteroventral setae, some strong spine-like setae toward apex ventrally. Hind tibia with numerous moderately long, rather strong setae over entire length; 1 seta in posteroapical comb. Fore basitarsus with some fine moderately long setae posterodorsally, remaining fore tarsomeres, mid and hind tarsi covered with simple short setae.

Wing membrane faintly infuscate; CuA+CuP (anal vein) complete, well sclerotised; basal costal seta absent; axillary incision acute. Squama brownish, dark fringed. Halter brownish.

Abdomen dark brown, brownish grey pruinescent, tergites somewhat lustrous; covered with long, dense, fine black setae. Segments 6–7 with unmodified structure; tergite 6 only with scattered minute setulae dorsally and several short fine posteromarginal setae; tergite 7 almost bare, with some fine setae posteromarginally (longer middorsally) and laterally. Segment 8 with tergite and sternite separated; tergite 8 simple, entire, subtriangular viewed laterally, very narrow mid-dorsally, broadly concave anteriorly, with almost straight posterior margin, numerous very long setae along posterior margin; sternite 8 simple, enlarged, subrectangular in lateral view, V-shaped viewed posteriorly, covered with numerous very long setae.

Terminalia ( Fig. 44 ) dark brown, black setose. Cerci separated from each other and from epandrium, not extended beyond tergite 8 anteriorly, without pair of subepandrial lobes beneath; cercus rather short, deeply cleft middorsally and divided almost entirely into two parts; basal part subquadrate (lateral view); apical part subrectangular, elongate, narrower on basal section, somewhat broadened apically, apex slightly concave; both parts covered with short fine setae. Epandrium subtriangular, with strongly produced narrow apical part, nearly 4X as long as basal portion width, extended far beyond cerci posteriorly, slightly concave on upper margin, with more or less straight lower margin; with several long closely set setae near upper anterior corner, numerous long setae over lower margin becoming denser and stronger on about middle, moderately long and scattered setae on apical part of epandrium. Subepandrial sclerite produced slightly beyond lower margin of epandrium. Hypandrium very narrow, rim-like, entire, well sclerotized; bare; gonocoxal apodeme directed anteriorly. Phallus well exposed, extremely long; mostly hair-like, knob-like thickened just beyond hypandrium; slightly sinuate, with broad even curvature shortly beyond basal thickening, gently curved on remaining part. Ejaculatory apodeme not extended beyond basal curvature of phallus, with broad lateral wings and similar vertical wing.

Female. Unknown.

Distribution. Eurasia; known only from Wrangel Island.

Etymology. The specific name refers to the similarity of the new species to R. macrura Loew.

Remarks. The new species belongs to the R. pusilla group sensu Barták & Kubík (2009) (see also Sinclair et al. 2019: 65). It resembles R. macrura Loew described from East Siberia (Irkutsk) (Loew 1871). Rhamphomyia macrura is somewhat smaller (wing length 4.8 mm vs. 6.7 mm in R. submacrura sp. nov.), has brush-like arranged long setae on the mid basitarsus and much longer epandrial lamellae (Frey 1954: 427, textfig. 214), which are nearly as long as the abdomen. The females of both species are unknown.

Figures

FIGURES 43, 44. Rhamphomyia (Pararhamphomyia) submacrura sp. nov., male, holotype. 43. habitus, lateral view; 44. terminalia, lateral view. Abbreviations: cerc—cercus; ej apod—ejaculatory apodeme; epand—epandrium; hypd—hypandrium; ph—phallus.