Hercostomus fedotovae Grichanov 2020, sp. nov.

Hercostomus fedotovae sp. nov.

urn:lsid:zoobank.org:act: 90F6AB29-BADE-4A85-B45E-F187894798A1

Fig. 2

Diagnosis

The new species belongs to the Hercostomus nectarophagus subgroup of species, differing distinctly by its small size, narrow face, fore tarsomere 3 simple, fore tarsomeres 4–5 flattened and widened, fore tarsomere 4 white and tarsomere 5 deep black. The hypopygium is similar to that in other species of the subgroup.

Etymology

The species is named for the Russian entomologist, Dr. Zoya Fedotova (VIZR: All-Russian Institute of Plant Protection, St. Petersburg), who has described over 1000 new gall midge species.

Material examined

Holotype

TANZANIA • ♂; Morogoro environs; 6.85° S, 37.67° E; 2–3 Dec. 2015; N. Vikhrev leg.; terminalia dissected, stored in glycerin in microvial pinned with the specimen; ZMUM.

Description

Male (Fig. 2)

MEASUREMENTS (in mm). Body length 2.4; antenna length 0.7; wing length 2.5; wing width 0.8. (Fig. 2A)

HEAD. Frons greenish-black, whitу pollinose; face densely white pollinose. One long, strong, vertical pair of ocellar setae; 1 short postvertical, pair of ocellar setae. Upper postocular setae black; lateral, lower ones white. Eye with short hairs; face glabrous. Face gradually narrowed towards palpi, 14 × as high as wide in middle, under antennae ¾ as wide as width of postpedicel, at clypeus ¼ as wide as width of postpedicel; clypeus not reaching lower margin of eyes. Antenna (Fig. 2B) as long as height of head, entirely black; pedicel short and wide, convex anteriorly on inner side, with short distal setulae; postpedicel subtriangular, angular distodorsally, as long as high, covered with short pubescence; arista mid-dorsal, black, with short hairs. Length ratio of scape to pedicel to postpedicel to stylus (1 st – 2 nd segments), 14/6/12/7/47. Palpus and proboscis moderately small, brown, with short black setae; palpus with 1 black bristle.

THORAX. Greenish-black, greyish pollinose, with yellow metepimeron. Six strong dorsocentral setae; 2 rows of acrostichals, nearly half as long as dorsocentrals; 2 strong notopleural, 1 strong humeral, 1 posthumeral setae present. Propleura with 1 strong black seta above fore coxa and few short hairs. Scutellum with 2 strong setae and 2 lateral hairs.

LEGS. Including coxae yellow; fore tibia and segments 1–3 of fore tarsus brownish; segment 4 white with black apex, segment 5 black; mid and hind tarsi black from tip of basitarsus; fore coxa with black hairs anteriorly and several setae in apical half; mid coxa with 1 strong lateral setae in addition to anterior hairs; hind coxa with 1 strong lateral setae; femora without long hairs; fore tibia without distinct setae; segments 1–3 of fore tarsus with ventral row of sparse short curved hairs; segment 4 flattened laterally, slightly widened, covered with white hairs and several black setae, segment 5 flattened laterally, strongly widened, with dorsal row of black flattened setae (Fig. 2C). Length of fore femur, tibia and tarsomeres 1–5 = 0.93 mm, 0.99 mm, 0.51 mm, 0.46 mm, 0.34 mm, 0.16 mm, 0.17 mm. Mid femur with 1 anterior and 1 posteroventral subapical setae; mid tibia with 1 anterodorsal, 2 posterodorsal and 3–4 apical setae. Length of mid femur, tibia and tarsomeres 1–5 = 0.98 mm, 1.28 mm, 0.65 mm, 0.35 mm, 0.31 mm, 0.2 mm, 0.15 mm. Hind femur with one subapical anterior seta; hind tibia with 2–3 anterodorsal, 2–3 posterodorsal, 2–3 fine ventral, 3–4 apical setae, thick brown-black apical spine anteriorly; segment 1 of hind tarsus with basal excavation anteriorly. Length of hind femur, tibia and tarsomeres 1–5 = 1.12 mm, 1.48 mm, 0.42 mm, 0.53 mm, 0.29 mm, 0.2 mm, 0.16 mm.

WINGS. Simple, greyish, veins brown. Costa simple. R 1 reaching to first third of wing length. R 2+3, R 4+5 weakly divergent. Ratio of part of costa between R 2+3, R 4+5 to between R 4+5, M 1+2: 3/1. R 4+5, M 1+2 slightly convergent in distal part; M 1+2 with weak bend in middle of distal part, joining costa just before wing apex. Crossvein dm-m straight, almost perpendicular to longitudinal wing axis, forming right angle with M 1+2, M 4 longitudinal veins. Ratio of dm-m to distal part of M 4, 19/46. Posterior wing margin almost evenly convex. Anal vein distinct, almost reaching wing margin; anal lobe reduced; anal angle absent. Lower calypter yellow, brown anteriorly, with brown setae. Halter yellow.

ABDOMEN. Greenish-black, weakly pollinose, with black hairs and marginal setae. Segment 7 short, 4 ⁄ 5 length of epandrium. Segment 8 large, covering more than half lateral side of epandrium, with numerous fine short dark cilia. Genitalia (Fig. 2 D–F) with epandrium brown-black, rounded-oval, twice longer than high. Foramen positioned before middle of left lateral side. Hypandrium mid-ventral, with short base, 4 long thick lobes of different lengths and widths; longest lobe wide, flat, thin, with pointed apex; thickest lobe of hypandrium strongly curved proximally, U-shaped (ventral view). Phallus thin, concealed. Distoventral epandrial lobe fused to epandrium, projected, with 2 short and 1 very long ventral epandrial setae. Surstylus yellow, small, bilobate; each lobe thick at base, thin distally, with 1 long basal seta and 1 short apical seta. Distal lobe of postgonite as long as cercus, broad, curved ventrally, pointed at apex (Fig. 2F). Ventral lobe of postgonite broad, subtriangular, strongly sclerotized, with serrate ventral margin (Fig. 2D). Cercus yellow, covered with light hairs; large basolateral lobe bearing 3–4 strong, several short setae, long narrow apex bearing 4 long pedunculate setae (Fig. 2D).

Female

Unknown.

Distribution

Tanzania.