Elaphropeza triseta, Grootaert & Velde & Shamshev, 2015

Grootaert, Patrick, Velde, Isabella Van De & Shamshev, Igor V., 2015, Two new coastal species of Elaphropeza Macquart (Diptera: Hybotidae) from Bali, Indonesia, European Journal of Taxonomy 112, pp. 1-10 : 2-5

Elaphropeza triseta sp. nov.

urn:lsid:zoobank.org:act:CD141962-6947-4418-AB0B-25A25A2F41E7

Figs 1–4

Diagnosis

A species of the E. ephippiata group; recognised by almost entirely yellow thorax, only postnotum brownish along posterior margin; antenna with scape and pedicel yellow; postpedicel short, about 1.5 times as long as wide, brown; legs yellow, with only tarsomere 5 dark brown, hind tibia with 3 brownish black anterodorsal bristles; halter yellow.

Etymology

The specific epithet refers to the presence of three anterodorsal bristles on the hind tibia.

Type material

Holotype

INDONESIA: ♂, Bali, Amed, Bunutan, beach, 8°20’19.44” S, 115°39’53.39” E, 2 Jan. 2014, leg. P. Grootaert & I. Van de Velde ( MZB).

Paratypes

INDONESIA: 2 ♂♂, 2 ♀♀, Bali, Amed, same provenance as holotype ( RBINS); 2 ♂♂, 2 ♀♀, Bali, Arya Amed, Bunutan, 8°20’38.89” S, 115°40’21.81” E, 25 Dec. 2013, leg. P. Grootaert & I. Van de Velde ( RBINS).

Description

Male ( Fig. 1 )

LENGTH. Body 2.3 mm, wing 2.1 mm.

HEAD. Occiput entirely black, largely shining, with yellowish setae; inner verticals long inclinate, outer verticals hardly prominent.Anterior ocellars long proclinate, posterior ocellars minute. Frons subshining, very narrow, above antennae about as broad as anterior ocellus. Antenna with scape and pedicel yellow, postpedicel and stylus brownish; pedicel with circlet of subequally short setulae; postpedicel short, nearly 1.5 times as long as wide; stylus very long, nearly 4.0 times as long as postpedicel, with short pubescence. Proboscis brownish yellow. Palpus yellow, small, rounded, silvery pubescent, bearing scattered setulae, subapical seta short.

THORAX. Almost entirely yellow, only antepronotum with brownish spot dorsally, postnotum brownish along posterior margin, hypopleuron brownish on extreme apex and metapleuron yellowish brown on upper part anteriorly; shining, with yellowish setation; anterior spiracle brownish yellow, posterior spiracle brown. Prothoracic episterna lacking long upturned seta just above fore coxa, with minute setula on upper part. Postpronotal seta hardly prominent. Mesonotum with 2 long notopleurals, 1 shorter postsutural supra-alar, 1 long postalar and 4 scutellars (apical pair very long, cruciate; lateral pair short); acrostichals short, arranged in 4 irregular rows anteriorly but becoming sparser and biserial posteriorly, distinctly separated from dorsocentrals, lacking on prescutellar depression; dorsocentrals arranged in 3–4 irregular rows, as long as acrostichals, 1 prescutellar pair very long.

LEGS. Long, slender, almost entirely yellow, only tarsomere 5 of all legs dark brownish. Coxae and trochanters with unmodified setation. Fore femur slightly thickened, with rows of minute anteroventral and posteroventral setae, long seta near base and 1 subapical bristle anteriorly. Fore tibia lacking prominent bristles (except subapicals). Mid femur with rows of minute anteroventral and posteroventral spinule-like setae (more numerous near base), 1 long seta near base and 1 long subapical bristle anteriorly. Mid tibia only with 1 black, short, subapical spine, lacking prominent setae (except subapicals). Hind femur with short anteroventrals and 3 erect dorsal setae near base. Hind tibia with 3 brownish black anterodorsal bristles; apical projection small, rounded, brownish. Tarsi of all legs unmodified, with unmodified setation.

WINGS. Normally developed, finely infuscate, covered with uniform microtrichia; veins mostly yellowish brown; basal section of M 1+2, crossveins bm-cu and r-m pale. Costal vein with moderately long, uniform setulae along anterior margin. Costal bristle long, brown. Costal index: 41/31/31. Vein Rs long, slightly longer than crossvein bm-cu. Vein R 2+3 evenly bowed. Veins R 4+5 and M 1+2 somewhat divergent near wing apex, R 4+5 slightly bowed, M 1+2 straight. Vein CuA 1 reaching wing margin. Vein A 1 lacking. Crossvein bm-cu slightly oblique. Crossvein r-m before middle of cell bm. Squama yellowish, with long, brownish yellow setae. Halter yellow.

ABDOMEN. Tergite 1 pale yellow; tergites 2–3 brownish yellow, subtriangular viewed laterally, divided medially, with scattered unmodified setae; tergite 4 brown, broadest, with squamiform setae; tergite 5 narrow, undivided, with squamiform setae; an ampoule-like structure below tergite 5; tergites 6–7 brownish yellow, tergite 6 undivided, with minute unmodified setae; tergite 7 undivided, with long posteromarginal setae; tergite 8 unmodified. Sternites yellowish, with scattered minute setae, sternite 8 with long, posteromarginal setae. Gland-like structure present between tergites 4 and 5, ampoule-like. Terminalia ( Figs 2–4 ) rather small, with cerci, apical part of right epandrial lamella and left surstylus brownish, otherwise yellow. Right epandrial lamella bifid ( Fig. 2 ); dorsal lobe with setae on dorsal margin. Tip with a brush of densely set, short setae. Ventral lobe with strong brown setae on apex. Right and left cerci equally long. Right cercus with a single long subapical seta, other setae short. Left cercus ( Fig. 3 ) bifid; outward lobe with 3 strong brown setae on apex. Tip of left epandrial lamella with 4 setae: 1 weak and 3 stronger. Left surstylus also bifid, with short setae ( Fig. 4 ).

Female

Similar to male; abdomen without ampoule-like gland-like structure; intersegmental area between tergites 4 and 5 set with short hairs, anteriorly with 2 openings; segment 8 moderately long, tergite and sternite 8 separated, yellowish brown; tergite 8 entire, with several short to moderately long setae posteriorly; sternite 8 entire, covered with moderately long setae; cercus small, yellowish.

Distribution

Bali, Indonesia.

Remarks

Elaphropeza triseta sp. nov. is actually the only yellow Oriental species with three anterodorsal setae on the hind tibiae. In the key of Grootaert & Shamshev (2012), E. triseta sp. nov. resolves closest to E. acrodactyla ( Melander, 1928) , described from a female from the Philippines, but the latter has only two anterodorsal bristles on the hind tibiae and has the postpedicel about three times as long as wide. In E. triseta sp. nov. the postpedicel is nearly 1.5 times as long as wide.

Figures

Fig. 1. Elaphropeza triseta sp. nov. Male habitus (photo J. Brecko).

Figs 2–4. Elaphropeza triseta sp. nov. Male terminalia. 2. Right epandrial lamella. 3. Epandrium with cerci. 4. Left surstylus. c = cerci; ls = left surstylus; rs = right surstylus. Scale bar = 0.1 mm.