Rhinoceromyia dubrovskii, Grichanov, 2024

Grichanov, Igor Ya., 2024, Rhinoceromyia, a peculiar new genus of long-legged flies from Guinea (Diptera: Dolichopodidae: Dolichopodinae), Zootaxa 5471 (4), pp. 489-495 : 491-493

Rhinoceromyia dubrovskii sp. nov.

urn:lsid:zoobank.org:act:2B4479DB-FCA7-433B-AD34-9FD44D9ED548

( Figs 1–3 )

Type material. HOLOTYPE ♂, labelled: “ Guinea: Nzérékoré prov. , subpref. Lola, Bossou vill., 7.64452°N, 8.50187°W, 2–5 August 2023, D. Dubrovskiy leg.” ( ZIN) . Holotype in good condition (male with terminalia dissected and stored in glycerin in microvial pinned with the specimen). PARATYPES: 1 ♂, 1 ♀, same data as holotype (dried and mounted on pins; ZIN) .

Description. Male ( Fig. 1A ). Body length 2.7 mm; wing 2.6 x 0.9 mm; antenna 0.9 mm. Head ( Fig. 1B ). Distinctly wider than high (13/10), with all major setae of head black; vertex flat; upper occiput flat; frons metallic greenish blue, 7 times wider than distance between antennal bases and ocellar tubercle; ocellar tubercle with one pair of strong, long divergent setae and a few short hairs; 1 strong, long outer vertical seta at upper corner of frons on each side at eye margin; 1 fine, short inner vertical seta between outer vertical seta and ocellar tubercle; ommatrichia between facets distinctly longer on lower half of eye; face mostly brown and light brown, metallic greenish blue under antennae; face under antenna 2 times as wide as basal height of postpedicel, slightly convergent towards clypeus; lower half of face ( Fig. 1C ) with large conoid horn bearing 2 brushes of golden setae on narrow apex (male secondary sexual characters); clypeus dark brown, covered with white microtrichia; antenna ( Fig. 1D ) mainly yellow-brown, brown along dorsal surface, black at apex of postpedicel; scape with rather strong setae dorsally and subtriangular pointed ventral process; pedicel with ring of rather strong setae, with lateral projections; postpedicel swollen at base, narrow distally, with pointed apex, densely covered with long hairs; arista-like stylus basodorsal, somewhat shifted onto outer surface of postpedicel, with short, thick white segment 1 and thin segment 2, flattened at base, mostly black, white on basal third or quarter, with long sparse pubescence; length (mm) of scape, pedicel, postpedicel, arista-like stylus: 0.09/0.09/0.26/0.66; proboscis projected, dark brown; palpus large, rounded, dark brown, with several black setae; postocular setae black, uniserial; upper postocular setae short, with uppermost seta long; lower setae rather strong. Thorax. Black, without distinct spot above notopleuron, with major setae black; weakly shiny greenish violet, weakly pollinose; five pairs of strong dorsocentral bristles decreasing in length anteriorly with several hairs on anterior slope of mesonotum; acrostichals well developed, uniserial between anterior two pairs of dorsocentrals, irregularly biserial between third and fourth pairs of dorsocentrals; 1 long and 1 short notopleural, 1 strong humeral seta and 1 strong posthumeral seta present; proepimeron with 1 strong seta and a few hairs above fore coxa; katepisternum (above mid coxa) with a few fine setae; katatergite (in front of posterior spiracle) without cluster of setulae; scutellum with 2 strong median setae, 2 lateral and 5–6 median marginal hairs. Legs. Mostly brownish yellow; fore coxa brown, mid and hind coxae black with brownish apex; mid femur brown at base; hind femur brown in basal half; last 3 segments of tarsi brown; fore and mid coxae with black hairs anteriorly and several setae in apical half; hind coxa with 1 strong external seta above middle; femora without long hairs; fore tibia with 1 anterodorsal seta at middle; fore tarsus simple, fore basitarsus with 2 short basiventral setae; mid femur with 1 strong anterior seta and 1 strong posteroventral preapical seta in addition to fine terminal posteroventral seta; mid tibia with 2 pairs of anterodorsal and posterodorsal setae at base and at middle, 1 anteroventral at middle and 5 apical setae; mid tarsus simple; hind femur with strong anterior seta at about distal 2/5 of femur; hind tibia simple, with 2 pairs of anterodorsal and posterodorsal setae at 1/3 and 2/3, 1 anteroventral, 2 apical setae; hind basitarsus with 1 basiventral seta and small posterior basal denticle; femur, tibia and tarsomere (from first to fifth) length (mm): fore leg: 0.73/0.69/0.38/0.13/0.12/0.09/0.11, mid leg: 0.96/1.07/0.43/0.22/0.15/0.09/0.09, hind leg: 1.04/1.06/0.31/0.37/0.18/0.12/0.13. Wing ( Fig. 1E ). Mostly brown, with brown veins, with 5 transparent spots in basal half and 5 transparent spots in distal half; lengths of costa between R 2+3 and R 4+5 and between R 4+5 and M 1 (in mm), 39 / 22; R 4+5 and M 1 subparallel in distal part of wing; M 1 almost straight; dm-m slightly convex; ratio of dm-m to distal part of M 4, 28/19; anal vein distinct, anal lobe developed, anal angle obtuse; calypter brown, with black setae; halter brown-black. Abdomen. Black, grey pollinose, with black hairs and marginal setae; sterna 5–6 weakly sclerotized; segment 6 small, with several fine setae; segment 7 reduced to narrow ring, bare; segment 8 light brown, rounded, covered with sparse black setae; hypopygium ( Fig. 1F ) mostly light brown; epandrium ( Fig. 2A ) cylindrical, as long as tergites 4–6 combined, more than 2 times longer than high, with left basolateral foramen, covered with white microtrichia; hypandrium narrow, simple, reaching apex of epandrium, fused with epandrium at base; phallus long and thin, concealed; distoventral epandrial lobe ( Fig. 2B ) long, with 1 dorsal seta at middle and 2 ventral setae at apex; postgonite broad and parallel-sided to apex (dorsal view); surstylus small, straight, with 2 short finger-like lobes; ventral lobe 2 times longer than dorsal one; both lobes bearing a few short setae at apex; cercus ( Fig. 2C ) brown-black, secondarily segmented, with distal section of cercus articulated with basal section; epandrium with distodorsal lobe supporting distal section of cercus; basal section of cercus covered with white dorsal cilia; distal section of cercus ( Fig. 2D ) rounded, with white cilia and 4 ventral and 1 dorsal strong, black marginal setae.

Female ( Fig. 3 ). Similar to male except lacking male secondary sexual characters. Body length 2.7 mm, wing 2.5 mm, antenna 0.7 mm. Face ( Fig. 3B ) nearly parallel-sided, with bulging clypeus; face and clypeus metallic greenish black, without horn; antenna ( Fig. 3A ) with postpedicel subtriangular, swollen at base, angular at apex, slightly longer than high (16/14); arista-like stylus with short thick white segment 1 and thin black segment 2; abdomen with 6 visible segments; terga 9+10 ( Fig. 3C ) divided medially into two short hemitergites, each bearing 5 thick spines; cercus yellow, elongate, with a few long white setae; anal plate subtriangular, covered with numerous tubercles.

Etymology. The species is named after the collector of the type material, Dmitriy V. Dubrovskiy, Moscow, Russia.

Ecology. The types were collected from a small plot of tropical forest near Bossou village (D. V. Dubrovskiy, pers. comm.) .

Distribution. Guinea: Nzérékoré Province, Lola Prefecture.

Figures

FIGURE 1. Rhinoceromyia dubrovskii sp. nov., male holotype in ethanol (A, B, D, E) and dried (C, F). A. Habitus. B. Head, lateral view. С. Facial horn, clypeus and palpus, lateral view. D. Antenna, lateral view. E. Wing. F. Hypopygium, dorsolateral view. A, B, D, E—in ethanol; C, F—dry.

FIGURE 2. Rhinoceromyia dubrovskii sp. nov., male genitalia of paratype after maceration. A. Hypopygium, lateral view. B. Apex of hypopygium, ventrolateral view. C. Apex of epandrium and cercus, dorsolateral view. D. Cercus, dorsal view.

FIGURE 3. Rhinoceromyia dubrovskii sp. nov., female paratype in ethanol. A. Head, lateral view. B. Head, anterior view. C. Apex of abdomen, lateral view, with inset showing terga 9+10, dorsal view.