Empis (Planempis) janssoni Saigusa

Saigusa, Toyohei, 2012, Revision of the type series of Empis (Planempis) mandarina Frey, the type species of Planempis (Diptera: Empididae), Zootaxa 3353, pp. 55-68 : 63-66

Empis (Planempis) janssoni Saigusa , sp. nov.

( Figs. 1 C, F, 3C—E, 5D, E, 6)

Empis (Planempis) mandarina: Frey, 1953: 40 (partim.). Empis mandarina: Frey, 1954: 417 (partim).

Empis (Planempis) mandarina: Frey, 1955: 11 (partim.).

Diagnosis. Medium-sized blackish species of E. ( Planempis ) with holoptic male eyes, black legs clothed with dense suberect pv hairs on hind femora, entirely infuscated wings, dull blackish mesonotum with multiserial acrostichals, and flat-topped male genitalia.

Description. Male holotype ( Fig. 1 C). Head black, shrivelled. Compound eyes practically touching on frons for long distance 1/2 as long as frons, with upper facets somewhat enlarged, ca. 1.5X as large as lower ones in diameter; frons and face black, dark grey pollinose, clypeus polished blackish brown. Occiput black, densely blackish grey pollinose; postocular ciliation short and black, dense occipital bristles long, black, scattering on entire surface; hairs on precervical swelling and along oral margin long and yellow; ocellar tubercle with pair of long ocellar bristles and 10 setae almost as long as or slightly shorter than ocellar bristles. Antenna excluding broken stylus slightly shorter than head, scape and basiflagellomere black, pedicel brown; basal two segments clothed with black setae, basiflagellomere 3.2X as long as basal thickness. Maxillary palpus orange yellow, slightly darkened basally, and clothed with a few black setae beneath; labrum 1.4X as long as head height, dark reddish brown.

Thorax ( Fig. 1 F) blackish brown to black; mesonotum densely pollinose, dull black; viewed from above or behind subdorsal stripes between acrostichal stripe and dorsocentral area dull dark grey, 0.75x as wide as acrostichal dull black stripe; humeral callus, anterior part of notopleural depression and postalar callus dark brown; pronotum and pleura dark grey pollinose; thoracic spiracles yellow. Chaetotaxy: Mesoscutum except for subdorsal stripes and prescutellar depression densely clothed with longish, fine yellow to brown hair-like setae mixing some black ones on anterior part, so that acrostichals and dorsocentrals are fine and multiserial, latter ending in strong prescutellar bristle; humeral callus densely clothed with long yellow hairs and bearing several longer black bristles on anterior part; notopleural depression with oblique row of 4 very strong black bristles on posterior part; 1 strong and 1 weak supra-alar bristle, 1 strong postalar bristle with a few minute setulae; scutellum with 9 bristles, apical and sublateral ones strongest; antepronotum with row of weak black setae and many long yellow hairs, proepisternum bearing dense long yellow hairs; prosternum bare; laterotergite bearing dense long yellow hairs mixing several black bristles on upper part.

Legs rather thick, blackish brown to black, and black setose. Coxae dark brown, densely grey pollinose, clothed with dense yellow hairs and bearing black bristles and hairs along distal margin of all coxae and vertical row of black bristles on outer surface of cx2 and cx3. Femora short setose above; f1 with fine short av hairs; f2 with av and pv rows of dense black setae 0.5x as long as f2 thickness; f3 ( Figs. 5 D, E) somewhat thickened and more or less compressed, longish setose, on dorsal and anterior surfaces bearing long bristles on anterior surface and several black bristles on ad surface of apical 0.5, and densely clothed with long erect yellow hairs on posterior to pv surfaces. Tibiae clothed overall with fine hairs; t1 with double row of longish dorsal bristles slightly shorter than t1 thickness; t2 with ad row of ca. 10 bristles, 2—3 pd bristles as long as t2 thickness and a few shorter pv bristles on subbasal part; t3 ( Fig. 5 D) weakly compressed laterally, keeping almost same thickness throughout length, densely long fine setose on ventral surface, minute erect pile on posterior surface, and bearing ad and pd rows of ca. 15 strong bristles as long as or slightly longer than t3 thickness. Tarsi short setose, fore and mid metatarsi with ventral bristles; hind metatarsus not thickened, with strong ventral bristles on basal 0.5, several ad and pd bristles in addition to apical bristles.

Wing ( Fig. 3 C) as illustrated, nearly 3X as long as wide, more strongly narrowed towards tip than in two other species, distinctly infuscated brownish; pterostigma and veins dark brown; M2 somewhat weakened near tip; R4 forming ca. 60˚ to R5 basally; outer margin of cell r2+3 about 0.8X as long as cell r4; discal cell rather short; cell cua sharply pointed distally. Halter dark brown with brown shaft.

Abdomen rather short, more or less stocky, black and thinly blackish pollinose; sides of terga 1—2 and anterior sterna brown to yellowish brown. Abdominal terga covered with short black setae; sides of anterior terga and sterna bearing long yellow hairs; posterior margin of abdominal tergum 1 with row of long black bristles scattered on lateral part of tergum. Abdominal tergum 8 0.33X as long as tergum 7, fused with more or less narrowed lateral areas of sternum, and bearing row of some 20 short fine setae along entire submarginal area; abdominal sternum 8 nearly 0.75X as long as sternum 7, and bearing row of longish hind marginal setae 0.5—1.0X as long as sternum in addition to irregularly scattered shorter setae on submarginal area.

Male genitalia ( Fig. 6 A): Flat-topped type. Cercus dark reddish brown, bearing short yellow setae, ventral process of cercus blackish, epandrial lobe dark brown and brown setose. Cerci ( Figs. 6 B, C) with dorsal surface flattened, combined cerci viewed from above longitudinally semi-oval with lateral margins gently curving inwardly from subbasal part to distal end, and inner margins surrounding long quadrate fenestrula, posterior open space 0.5X as long as wide; dorsal process of cercus weakly produced dorsally and moderately produced ventrally into rather short drooping, containing two concavities, dorsal one vertically elongate with two shallow scoops; in posterior aspect apex of drooping part of dorsal process short bifid into outer rounded projection and mesal projection furnished with dense comb-like spinules along distal margin; middle swelling of cercus pointed apically in lateral aspect; ventral process of cercus short, keeping same thickness to almost truncate apex; supra-anal area with triangular sclerotization pointed distally and with irregular wrinkles; subanal area with U-shaped weak sclerotization; epandrial lobe with roundly truncate distal margin and bearing ordinary bristles; hypandrium very narrow and widely membranized ventromedially; phallus outside from coelom ( Figs. 6 D, 6E) rather short, middle 0.5 strongly swollen, with pair of triangular lamellate lateral expansions and dorsal keel triangularly produced beyond middle, distal 0.25 evenly curved semi-circularly, gradually tapered to middle, then much tapered beyond middle.

Length: Body 7.9 mm; wing 9.5 mm.

Female. Head black; compound eyes widely separated on frons with subequal facets; frons slightly wider than ocellar tubercle, densely blackish brown pollinose, bearing several short black bristles near eye margins close to antennal sockets; face as wide as frons above, slightly dilating towards oral margin and dark greyish brown pollinose; clypeus polished black. Ocellar tubercle with pair of short, curved ocellar bristles together with a few shorter setae; postocular ciliation of short fine setae and continuing to several strong bristles on vertex; a few long brownish hairs along posterior oral margin; occipital bristles irregularly biserial, very strong on dorsal part; precervical swelling furnished with a few long yellow hairs. Antenna blackish brown; relative lengths of 3 antennal segments and stylus 21:10:34:13; two basal segments short black-setose; maxillary palpus as in male; labrum brown, darker towards base, slightly longer than 2X height of shrivelled head.

Thorax including spiracles almost as in male in colouration and pollinosity. Chaetotaxy: Acrosticals and dorsocentrals multiserial, shorter than in male and mostly black; latter ending in 2 fairly strong bristles and clothed with short black setae spread from posthumeral to supra-alar areas; 1 strong supra-alar, 1 strong postalar bristle; scutellum bearing 6 bristles, apical and subapical ones strongest; other thoracic vestiture as in male.

Legs blackish brown to black (yellowish brown to brown in teneral female paratypes), and black-setose. Coxae dark brown, densely grey pollinose, with black hairs and bristles, cx1 clothed with short pale hairs on antero-mesal surface. Fore femur short haired above, with a few short fine av hairs; f2 with av row of short setae and bearing rather dense longish black hairs on apical half of pv surface; f3 clothed with longish setae, bearing several long suberect ad setae on basal 0.33, several weak av bristles on apical 0.25, and dense row of long erect black pv hairs as long as f3 thickness on apical 0.66 of f3, hairs shorter on middle 0.33. Fore tibia clothed beneath with longish fine hairs, and with pd row of several weak bristles; t2 with ad and pd row of rather strong bristles, 2 similar av bristles towards tip, and bearing rather dense pv setae on basal 0.33; t3 bearing ad and pd row of strong bristles 1.5X as long as t3 thickness, clothed posteroventrally with dense long rather strong suberect setae longest at middle, gradually shortened towards base, abruptly so towards tip. Metatarsi slender, bearing a few strong bristles beneath; hind metatarsus with a few similar ad and pd bristles.

Wing ( Figs. 3 D, E) and halter almost as in male.

Abdomen blackish brown, rather densely greyish brown pollinose, more or less subshining; vestiture similar to male but setae shorter.

Length: Body 6.2–9.1 mm; wing 7.5–9.6 mm.

Type material. HOLOTYPE ɗ, labelled: N.E. BURMA / Kambaiti, 2000m / 18/5.1934 Malaise// Holotype / Empis (Planempis) / janssoni Saigusa, 2012 // [PARALECTOTYPE]/ Empis (Planempis) / mandarina Frey, 1953 / designated by/ T. Saigusa, 2012 // (male genitalia and posterior part of abdomen macerated and preserved in vial with glycerol, and left wing detached from body and mounted between cover slips with Canada balsam; left hind leg detached from body and mounted on minuten, attached to main pin) ( ZMH).

Paratype: 1 Ψ, N.E. BURMA / Kambaiti 7000ft./ 24/5 1934 / R. MALAISE// [PARALECTOTYPE]/ Empis (Planempis) / mandarina Frey, 1953 / designated by / T. SAIGUSA, 2012 // [PARATYPE]/ Empis (Planempis) / janssoni / Saigusa, 2012 (right wing detached from body and mounted between cover slips with Canada balsam and attached main pin); 1 Ψ, N. E. BURMA, Kambaiti, 2000m / 23/5. 1934 Malaise // [PARALECTOTYPE]/ Empis (Planempis) / mandarina Frey, 1953 / designated by / T. SAIGUSA, 2012 // [PARATYPE]/ Empis (Planempis) / janssoni / Saigusa, 2012; 1 Ψ, N. E. BURMA, Kambaiti, 2000m / 25/5. 1934 Malaise // [PARALECTOTYPE]/ Empis (Planempis) / mandarina Frey, 1953 / designated by / T. SAIGUSA, 2012 // [PARATYPE]/ Empis (Planempis) / janssoni / Saigusa, 2012 (right wing detached from body and mounted between cover slips with Canada balsam and attached to main pin) (all in ZMH).

Type-locality. N. E. Burma: Kambaiti 2000 m.

Distribution. Myanmar.

Etymology. The new species is named after the late Dr. Antti Jansson, a taxonomist of aquatic Hemiptera and staff member of the Zoological Museum of University of Helsinki, who helped the author during his stay at the museum in 1985, while working on Dr. Frey’s species of Empididae .

Remarks. The holotype is one of two male syntypes of E. mandarina sensu Frey taken from Kambaiti. This species is somewhat similar to the lectotype of E. mandarina , but the new species is easily distinguished from E. mandarina by the multiserial acrostichals and dorsocentrals, black legs, hind femur bearing fine long pale posterior hairs and different shape of male cerci, of which the dorsal process is produced ventrally and apically bifid. The female is also unique in having dense long suberect black hairs on the posteroventral surface of the hind femur, a similar character to the male except for black coloration of hairs.

Figures

FIGURE 1. Empis (Planempis) spp., male; A – C: habitus, lateral aspect; D-F: anterior part of body, dorsal aspect. A, D: E. (P.) mandarina Frey, lectotype male; B, E: E. (P.) lindebergi sp. nov., holotype male; C, F: E. (P.) janssoni sp. nov.

FIGURE 3. Wings of Empis (Planempis) spp. A: E. (P.) mandarina Frey, lectotype male; B: E. (P.) lindebergi sp. nov., holotype male; C: E. (P.) janssoni sp. nov., holotype male; D: ditto, paratype female 1; E: ditto, paratype female 2; F: E. (P.) sp. female syntype of E. (P.) mandarina sensu Frey from Kuatun.

FIGURE 5. Hind legs of Empis (Planempis) spp., male; A-D: left hind leg excluding coxae; B: middle part of hind tibia showing ventral erect pile; E: hind femur showing pale posteroventral hairs; A, B: E. (P.) mandarina Frey, lectotype; C: E. (P.) lindebergi sp. nov., holotype; D, E: E. (P.) janssoni sp. nov., holotype.

FIGURE 6. Empis (Planempis) janssoni sp. nov., holotype male; A; genitalia, lateral aspect; B: cerci, dorsal aspect; C: ditto, posterior aspect; D: phallus (excluding part in coelom), lateral aspect; E. ditto, ventral aspect.