Empis (Planempis) gavryushini Shamshev, 2020

Shamshev, I. V., 2020, FIRST RECORD OF THE SUBGENUS PLANEMPIS FREY (DIPTERA, EMPIDIDAE: EMPIS LINNAEUS) FROM VIETNAM, WITH DESCRIPTIONS OF THREE NEW SPECIES AND A KEY TO SPECIES OF THE ORIENTAL REGION, Far Eastern Entomologist 409, pp. 1-13 : 2-6

Empis (Planempis) gavryushini Shamshev , sp. n.

http://zoobank.org/NomenclaturalActs/ 9B930F43-87BC-4529-AF42-0439937BA80D

Figs 1–4

TYPE MATERIAL. Holotype – ♂, Vietnam : labelled as “VNM [= VIETNAM]: Lai Châu Prov., Hoàng Liên N.P., 22.34997°N, 103.76818°E, 1947 m, 19.IV 2012, D. Gavryushin ”; “ Holotypus Empis gavryushini Shamshev , sp. n. ” ( ZMMU) . Paratype: 1 ♀, same data as holotype ( ZMMU) .

DIAGNOSIS. Large (body about 7 mm) greyish flies with extensively yellowish legs and incomplete veins M 1 and M 2; highly sexually dimorphic. Male: holoptic;

hind tibia evenly thickened toward apex, yellow; abdomen partly yellowish; upper lobe of cercus with subtriangular apicoventral prolongation. Female: discal cell very long, almost reaching wing-margin; mid and hind legs extensively pennate.

DESCRIPTION. Male ( Fig. 1 ). Body length 7.1 mm, wing length 7.7 mm. Head black. Holoptic, eye with upper ommatidia enlarged. Frons represented by very small triangular space below ocellar tubercle and slightly larger subtriangular space above antennae, densely greyish pruinose, bare. Face broad, mostly densely greyish pruinose, shiny along lower margin, bare. Ocellar triangle with 2 long black setae.

Occiput densely greyish pruinose; with transverse row of 6 long black setae on upper part laterally, moderately long black postoculars, long pale hair-like setae behind mouth-opening. Antenna with scape and pedicel reddish brown, postpedicel and stylus black; scape almost 2 times longer than pedicel, both with minute setulae;

postpedicel conical, very narrow at base, nearly 4 times longer than wide; stylus short, nearly 3 times shorter than postpedicel. Palpus brownish on about basal half and brownish yellowish apically; with scattered, short, dark, fine setae. Proboscis with labrum only slightly longer than head height (1.2 times).

Thorax black (postalar tubercle and scutellum laterally somewhat yellowish brown), mostly densely brownish grey pruinose; mesoscutum with 3 equally broad,

brownish, rather indistinct vittae along rows of acrostichals and dorsocentrals.

Prosternum bare. Proepisternum with numerous fine, pale, long setae on lower portion, bare on upper portion opposite anterior spiracle. Antepronotum with 5

black setae of different lengths (2 longest) on each side. Postpronotal lobe with 1

long black seta and numerous minute black setulae anteriorly. Mesonotal setation well prominent, main setae black; 1 short presutural intra-alar, 1 long presutural supra-alar (with 3 additional fine setulae anteriorly), 4 long notopleurals, 1–2 postsutural supra-alars, 2 postalars (1 seta minute) and 4 scutellars (apical pair cruciate,

longer than lateral pair); in addition, notopleuron with numerous pale and black fine setulae anteriorly; acrostichals arranged in 2 irregular rows, very short, scattered,

lacking on prescutellar depression; dorsocentrals uniserial, sparse, somewhat longer than acrostichals, 2 prescutellar pairs long. Laterotergite with numerous yellowish setae. Anterior and posterior spiracles yellow.

Legs long, slender, subshiny (except coxae), mostly with dark setation; coxae densely greyish pruinose with yellowish fine setae anteriorly (in addition to stronger black setae); right mid leg missing in holotype. Legs colour: coxae darkened on basal part, yellowish toward apex; fore trochanter brownish yellow, mid and hind trochanters brownish; femora and tibiae almost entirely yellowish, only hind tibia somewhat brownish on apex; fore and mid tarsomeres 1–2 mostly yellowish, hind basitarsus yellowish near extreme base, otherwise tarsi brownish. Femora similarly covered with mostly minute setulae, bare ventrally; mid femur with rows of dark,

fine, very short anteroventral and somewhat longer posteroventral setae; hind femur only with some very short anteroventral setae near apex. Fore tibia with 2–3 short dorsal setae on apical half. Mid tibia with row of short anterodorsal, 3–4 hardly prominent posterodorsal and posteroventral setae. Hind tibia evenly thickened toward apex (lateral view), slightly curved (posterior view); with numerous moderately long setae on about apical 2/3 dorsally; 1 minute seta in posteroapical comb. Tarsomeres slender; hind basitarsus with 1 short anterodorsal seta closer to middle and 2 similar posterodorsal setae.

2 – cerci, male, dorsal view; 3 – terminalia, lateral view; 4 – female habitus, lateral view.

Abbreviations: epand – epandrium; low cerc – lower lobe of cercus; up cerc – upper lobe of cercus.

Wing membrane faintly infuscate. Basal costal seta present, short. Pterostigma distinct, brownish. Veins brownish, well sclerotised; M 1 and M 2 incomplete. Cell

dm long, with elongate apex, its posterior margin (middle section of M 4) nearly 1.5

times longer than apical section of M 4. Anal lobe well-developed; axillary incision acute. Squama yellow, pale fringed. Halter yellow.

Abdomen bicoloured; tergites mostly dark brown, tergites 2–3 broadly and tergites 4–7 narrowly yellowish laterally; mostly rather shiny, tergite 1 densely greyish pruinose, tergite 2 faintly greyish pruinose anteriorly; tergites 1–3 with long fine yellowish setae laterally and short black setae dorsally, remaining tergites with very short intermixed pale and black setae laterally and similar black setae dorsally.

Sternites 1–3 entirely yellowish, sternites 4–7 becoming gradually darker toward terminalia with narrow yellowish posterior margin, sternite 8 entirely dark; all sternites faintly greyish pruinose, mostly with pale setae, sternites 7–8 with black setae posteriorly. Pregenital segments unmodified.

Terminalia ( Figs 2, 3 , not dissected) moderately large. Cerci reddish brown,

subshiny, faintly pruinose, mostly bare, broadly fused on basal part, flattened dorsally, combined cerci broadly rounded (dorsal view) ( Fig. 2 ), divided into two lobes (lateral view); “fenestrula” large, cylindrical; upper lobe of cercus narrow

(lateral view) ( Fig. 3 ), with long, somewhat broadened toward apex apicoventral prolongation, bearing numerous brownish setulae apically; lower lobe of cercus subtriangular (lateral view), with dense dark setulae along lower margin and apically. Epandrial lamella mostly hidden by segment 8, visible apical part dark brown, broad, rather subtriangular, dark brown, with short, fine, pale and dark setae. Hypandrium and phallus invisible in situ.

Female. ( Fig. 4 ). Body length 7.7 mm, wing length 6.3 mm. Head and thorax as in male, except the following characters: dichoptic, ommatidia equally small; frons broad, parallel-sided, densely light grey pruinose, with marginal setulae; thorax slightly higher, more humped. Legs of similar colour but shorter and more robust,

hind femur evenly convex dorsally, hind tibia uniformly slender; mid femur with long pennate setae dorsally and longer similar setae posteroventrally over entire length;

hind femur with similar pennate setae dorsally and ventrally over entire length; mid tibia with short pennate setae dorsally (except narrow apical and basal parts), longer pennate posteroventral setae on about basal half, row of 6 short, strong, anterodorsal setae, 4–5 similar anteroventral setae on about apical half; hind tibia with fringe of very short pennate setae on about middle, long pennate setae on about basal half ventrally, 5–6 short strong anterodorsal setae. Wing shorter and somewhat broader,

axillary excision almost 90°; basal costal seta absent; veins somewhat thicker, espe-

cially those forming discal cell; R 2+3 and R 4+5 strongly divergent, fork equilateral;

discal cell very long, almost reaching wing margin, subsequently M 1, M 2 and M 4

very short. Abdominal tergites mostly blackish brown to brown, tergites 2–6

narrowly brownish posteriorly; entire tergite 1, most part of tergite 2 anteriorly,

tergite 3 narrowly laterally and entire tergites 7–8 greyish pruinose, otherwise tergites shiny; only tergites 1–2 with some longer pale and black setae, remaining tergites with minute setae. Sternites 2–6 brownish with yellowish posterior margin,

greyish pruinose. Cercus dark, long, slender, with dark setulae.

DIFFERENTIAL DIAGNOSIS. Planempis includes one Palaearctic and two

Oriental species with incomplete veins M 1 and M 2: E. dahuriensis Shamshev, 2002

known from Russia (Amurskaya oblast) as well as E. shennongana Wang, Li et

Yang and E. prolongata Wang, Li et Yang known from China (Hubei) (Shamshev,

2002; Wang et al., 2010). Main differences between the new species and its Oriental allies are indicated in the key given below. In addition, the new species differs from

E. dahuriensis primarily by larger size (7 mm vs about 5 mm) and by three equally broad, brownish vittae on the mesoscutum (vs. mesoscutum uniformly light grey pruinose).

ETYMOLOGY. The epithet refers to the name of the collector, Dmitry

Gavryushin (Moscow).

DISTRIBUTION. Oriental: Vietnam.

Figures

Figs 1–4. Empis (Planempis) gavryushini sp. n. 1 – male habitus, holotype, lateral view;