Empis (Planempis) vietnamensis 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 : 8-11

Empis (Planempis) vietnamensis Shamshev , sp. n.

http://zoobank.org/NomenclaturalActs/ B0035690-0E81-4560-BD42-BC65944DA49D

Figs 7–10

TYPE MATERIAL. Holotype – ♂, Vietnam : labelled as “VNM [= VIETNAM]:

Lai Châu Prov., Hoàng Liên N.P., 22.34997°N, 103.76818°E, 1947 m, 16.IV 2012 ,

D. Gavryushin ”; “ Holotypus Empis vietnamensis Shamshev , sp. n. ” ( ZMMU). Para-

types: 3 ♂♂, same locality as holotype (1 ♂, ZMMU; 2 ♂♂ ZIN, one dissected) .

DIAGNOSIS. Large (body about 8.5 mm) flies with entirely orange yellow thorax and largely yellow abdomen; eyes holoptic; antenna with scape, pedicel and about basal half of postpedicel reddish; legs extensively brownish; halter with darkened knob and yellow stem.

mm (holotype 8.9). Head mostly black, occiput yellowish behind moth-opening and narrowly round neck, face and gena reddish brown. 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, almost entirely densely greyish pruinose, shiny along lower margin, bare. Ocellar triangle with 2 minute dark setulae. Occiput densely greyish pruinose; with transverse row of 5–6 moderately long black setae on upper part laterally, very short black postoculars, pale hair-like setae behind mouthopening. Antenna with scape, pedicel and about basal half of postpedicel reddish,

remaining part of postpedicel and stylus brownish; scape nearly 2 times longer than pedicel, both with minute setulae; postpedicel conical, narrow, nearly 3 times longer than wide; stylus nearly 1.5 shorter than postpedicel. Palpus brownish on about basal half and yellowish apically; with scattered dark fine setae. Proboscis with labrum only slightly longer than head height (in holotype 1.2 times).

Thorax entirely brightly orange yellow, faintly pale pruinose, scutum dull. Prosternum bare. Proepisternum with several fine pale setae on lower portion, bare on upper portion opposite anterior spiracle. Antepronotum with 4–6 black short setae on each side. Postpronotal lobe with 1 short, fine, dark seta, 3–4 slightly shorter setae anteriorly and some minute setulae. Mesonotal setation very reduced; 1 short fine presutural supra-alar, 3 notopleurals (anterior seta much finer and shorter), 1–2

postsutural supra-alars, 2 postalars (1 seta minute) and 4–6 scutellars (6 only in one paratype); acrostichals present only on anterior part of scutum, very few in number,

minute, 1–2-serial (in holotype uniserial); dorsocentrals uniserial, sparse, mostly minute, slightly longer than acrostichals, 1 presutural pair long. Laterotergite with numerous fine yellowish setae. Anterior and posterior spiracles yellow.

Legs long, slender, subshiny (including coxae), with dark setation. Legs colour:

coxae and trochanters concolourous with thoracic pleuron (trochanters with narrow brown subapical stripe); fore femur almost entirely yellow, only narrowly brownish on apex (broader dorsally); mid and hind femora with similar pattern but mostly brownish yellow and chestnut brown, respectively; tibiae and tarsi blackish brown

(fore tibia sometimes slightly paler). Femora similarly covered with mostly minute setulae; mid femur with rows of somewhat stronger anteroventral and posteroventral setulae; hind femur almost uniformly slender, slightly narrowed toward base. Fore tibia without prominent setae (except circlet of moderately long subapicals). Mid tibia with 3–4 short, hardly distinguishable anterodorsal and some similar anteroventral setae. Hind tibia slightly evenly thickened toward apex (lateral view) and slightly curved (posterior view); with numerous moderately long setae dorsally; 1

very short seta in posteroapical comb. Tarsomeres mostly slender, without prominent setae dorsally; hind basitarsus rather slightly thickened but at most as wide near base as hind tibia at apex; basitarsi with some strong setae ventrally.

Wing membrane faintly brownish infuscate. Basal costal seta absent.

Pterostigma distinct, brown. Veins brownish, well sclerotised; M 1, M 2 and anal vein

(CuA+CuP) complete (M 1 and M 2 slightly finer on extreme apex); R 5 and M 1 strongly divergent near wing-margin. Cell dm short, with elongate apex, its posterior margin

9

(middle section of M 4) shorter than apical section of M 4. Anal lobe well-developed;

axillary incision acute. Squama yellowish, pale fringed. Halter with darkened knob and yellow stem.

view; 8 – male postabdomen, lateral view; 9 – cerci, dorsal view; 10 – phallus, lateral view.

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

Abdomen bicoloured, with broad dark brown stripe dorsally, otherwise yellow;

almost shiny, very faintly greyish pruinose; mostly with pale fine setae longer on tergites 1–3 laterally, black setulae on tergites dorsally and on sternite 8 postero-

marginally. Pregenital segments unmodified, segment 8 with fused tergite and sternite.

Terminalia ( Figs 8–10 ) moderately large. Cerci ( Fig. 8 ) reddish brown, faintly greyish pruinose, subshiny, broadly fused on basal part, flattened dorsally, combined cerci ( Fig. 9 ) rather subrectangular viewed dorsally, divided into two lobes (lateral view) with additional rounded swelling between them, “fenestrula” inverted triangular

(dorsal view); upper lobe of cercus narrow viewed laterally, with short, rounded,

apicoventral prolongation, bearing numerous brownish and yellowish setulae apically;

lower lobe digitiform (lateral view), with numerous, fine, short, brownish to brownish yellow setae. Epandrial lamella fused with cercus, mostly yellowish, brownish apically, subshiny, rather subrectangular, rounded apically (lateral view), with dark setae mostly along lower margin and apically. Hypandrium represented by two narrow lateral sclerites, membraneous medially, bare. Phallus ( Fig. 10 ) almost entirely hidden, yellow, strongly thickened, convex and with three small wing-like projections on middle part (lateral view), abruptly narrowed into slender, moderately long, curved forward apical portion. Ejaculatory apodeme large, extending far beyond basal curvature of phallus, four-winged, lateral and lower wings small, upper wing much larger.

Female. Unknown.

DIFFERENTIAL DIAGNOSIS. Planempis includes two species with partly yellow head and yellow thorax: E. freyi Yang, Zhang et Zhang, 2007 (replacement name for E. quinquelineata Frey, 1953) known from China (Fujian) and E. lurida

Saigusa, 1992 known from Japan (Shikoku, Kyushu) (Frey, 1953; Saigusa, 1992).

The new species can be readily distinguished from E. freyi primarily by much larger size (body about 8 mm vs. 4 mm in E. freyi ), uniformly orange yellow mesoscutum

(vs. with four blackish vittae in E. freyi ) and holoptic eyes of the male (vs. dichoptic,

separated by broad frons in E. freyi ). The new species resembles more E. lurida ,

both species are similar in body size and have holoptic eyes of the male. However,

the new species differs from E. lurida primarily by extensively darkened legs (vs.

almost entirely orange yellow in E. lurida ), simple abdominal tergite 8 of the male

(vs. with dorsomedial projection in E. lurida ) and flattened dorsally cerci (vs. with projection in E. lurida ).

ETYMOLOGY. The epithet refers to the country of the origin of the new species,

Vietnam.

DISTRIBUTION. Oriental: Vietnam.

Figures

Figs 7–10. Empis (Planempis) vietnamensis sp. n. 7 – male habitus, holotype, lateral