Empis (Planempis) laichauensis 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 : 6-8

Empis (Planempis) laichauensis Shamshev , sp. n.

http://zoobank.org/NomenclaturalActs/ A3AE9FA3-3626-453C-81F4-CC48608093F3

Figs 5, 6

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 laichauensis Shamshev , sp. n. ” ( ZMMU) .

DIAGNOSIS. Large (body 6.5 mm) brownish grey flies; eyes holoptic, antennae extensively orange; mesonotal setation very reduced, 2 notopleurals and 2 scutellars;

legs yellow to brownish yellow, hind tibia and hind basitarsus slightly thickened;

abdominal tergites with subtriangular large brownish spot anteriorly, remaining part pale grey.

DESCRIPTION. Male ( Fig. 5 ). Body length 6.5 mm, wing length 6.9 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, densely greyish pruinose,

bare. Ocellar triangle with 2 moderately long black setae. Occiput densely greyish pruinose; with transverse row of 4 short black setae on upper part laterally, very short black postoculars, long pale hair-like setae behind mouth-opening. Antenna almost entirely orange, only tip of postpedicel slightly darkened and stylus blackish;

scape nearly 1.5 times longer than pedicel, both with minute setulae; postpedicel conical, narrow, 2.5 times longer than wide; stylus 1.6 times shorter than postpedicel.

Palpus yellowish brownish on about basal half and yellowish apically; with scattered dark and pale fine setae. Proboscis with labrum only slightly longer than head height

(1.2 times).

Thorax mostly dark, postpronotal lobe and postalar tubercle yellowish brown;

mostly densely greyish brown pruinose; mesoscutum somewhat darker than meso-

pleuron, with brownish narrow vitta along acrostichals and two broader vittae along dorsocentrals (dorsal view). Prosternum bare. Proepisternum with several fine, pale,

short setae on lower portion, bare on upper portion opposite anterior spiracle. Antepronotum with 5 black and yellowish short setae on each side. Postpronotal lobe with 1 short, fine, yellowish seta and some minute pale setulae anteriorly. Mesonotal setation very reduced, main setae black; 1 short fine presutural supra-alar (with 1–2

additional setulae), 2 moderately long notopleurals, 1 short fine postsutural supraalars, 2 postalars (1 seta minute, yellowish) and 2 scutellars; in addition, notopleuron with numerous pale setulae anteriorly; acrostichals present only on anterior part of scutum, very few in number, minute, biserial; dorsocentrals uniserial, sparse,

mostly minute, presutural pair only slightly longer. Laterotergite with numerous fine yellowish setae. Anterior and posterior spiracles yellow.

6 – male postabdomen, lateral view. Abbreviations: epand – epandrium; low cerc – lower lobe of cercus; up cerc – upper lobe of cercus.

Legs long, slender, subshiny (including coxae), mostly with dark setation, only coxae with yellowish fine setae anteriorly (in addition to stronger black setae). Legs colour: coxae yellowish, only fore and hind coxae somewhat darkened near extreme base; trochanters brownish yellow; femora entirely yellow; tibiae extensively yellow,

only hind tibia brownish yellow on about apical 2/3; basitarsi mostly brownish yellow

(except darker apex), remaining tarsomeres of all legs brownish. Femora similarly covered with mostly minute setulae; mid femur with rows of more or less distinct anteroventral and stronger posteroventral setulae; hind femur almost uniformly slender, slightly narrowed toward base. Fore tibia with somewhat longer setae posterodorsally. Mid tibia without prominent setae (except circlet of short subapicals).

Hind tibia slightly evenly thickened toward apex (lateral view), straight (posterior view); mostly with short setulae, some short anterodorsal and posterodorsal setae closer to apex; 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 indistinct, brownish yellow. Veins brownish, well sclerotised; M 1, M 2

and anal vein (CuA+CuP) complete; R 5 and M 1 slightly divergent near wing-margin.

Cell dm short, with elongate apex, its posterior margin (middle section of M 4)

shorter than apical section of M 4. Anal lobe well-developed; axillary incision acute.

Squama dirty yellow, pale fringed. Halter yellowish.

Abdomen with tergites dark, densely pruinose, with subtriangular large brownish spot anteriorly, remaining part pale grey; sternites rather reddish brown, densely greyish pruinose; tergites 1–3 with rather sparse, long, pale setae laterally, remaining tergites with very short pale setae laterally, all tergites with some scattered blackish setulae dorsally. Sternites mostly with scattered pale setae, only sternite 8 with dark, moderately long, posteromarginal setae. Pregenital segments unmodified,

tergite 8 fused with sternite 8.

Terminalia ( Figs 6 , not dissected) moderately large. Cerci mostly reddish brown,

subshiny, faintly pruinose, mostly bare, broadly fused on basal part, flattened dorsally,

combined cerci broadly rounded (dorsal view), divided into two lobes of subequal size (lateral view); “fenestrula” small, elongate oval; upper lobe of cercus rather subrectangular viewed laterally, with short, yellowish, pointed apicoventral prolongation

(posterior view), numerous brownish setulae apically; lower lobe subtriangular

(lateral view), with dense dark setulae along lower margin and apically. Epandrial lamella mostly hidden by segment 8, visible apical part subtriangular, dark brown,

with moderately long blackish setae. Hypandrium and phallus invisible in situ.

Female. Unknown.

DIFFERENTIAL DIAGNOSIS. Among the Oriental species of Planempis the new species is similar to E. holocleroides Frey known from Japan (Kyushu) and

Myanmar as well as to E. tianmushana Li, Saigusa et Yang known from China

(Zhejiang) (Li et al., 2012). Main differences between these species are indicated in the key given below.

ETYMOLOGY. The epithet refers to the type locality of the new species, Lai

Châu Province ( Vietnam).

DISTRIBUTION. Oriental: Vietnam.

Figures

Figs 5, 6. Empis (Planempis) laichauensis sp. n. 5 – male habitus, holotype, lateral view;