Micromorphus vikhrevi, Grichanov, I. Ya., 2024

Micromorphus vikhrevi sp.n.

Figs 1–6.

MATERIAL. Holotype ♂, Turkey, Mersin prov., near Silifke , 36.405°N, 33.804°E, river, 23.IV.2010, N. Vikhrev leg. ( ZMMU; male terminalia dissected and stored in glycerin in microvial pinned with the specimen) GoogleMaps . Holotype in good condition.

DESCRIPTION. Male ( Fig. 1). Head ( Fig. 2). Frons and face bluish black, whitish pollinose; one long vertical seta at upper corner of frons; one short postvertical seta positioned behind vertical seta; ocellar setae long; postocular setae mainly white, slightly increasing in length downward, few upper postoculars dark; eyes with short ommatrichia; face under antennae 1.6 times as wide as height of postpedicel, narrowing towards clypeus; antenna black, slightly longer than head height; scape small, vase-like; pedicel larger, globular, with ring of short setulae and 1–2 elongate apicodorsal setae; postpedicel subtriangular, as long as high at base, densely haired; arista-like stylus dorsoapical, nearly 6 times as long as postpedicel, pubescent, with short thick segment 1 and filiform segment 2; length (mm) of scape, pedicel, postpedicel, stylus, 0.04/0.05/0.07/0.4; proboscis small, brown, palpus yellow, oval, with light seta and white pubescence. Thorax. Black, with black bristles; mesonotum weekly pollinose, flattened posteriorly; pleura whitish pollinose; 5 (2+3) dorsocentrals, with 5 th seta shifted towards lateral margin and 1 st seta short; acrostichals absent; upper propleuron with 3 short white setae; proepisternum with 3 short white setae; scutellum with 1 pair of strong bristles. Legs. Including coxae yellow, tarsomeres 3–5 blackish brown; all tarsi simple, with segment 5 flattened dorso-ventrally, with small pulvilli and claws; fore and mid coxae with yellow anterior and apical setae; hind coxa with 1 yellow bristle at middle; fore leg without strong setae and long hairs; mid femur simple, bearing 1 strong but short anterior subapical bristle and 2 rows of ventral hairs, half as long as height of femur; mid tibia simple, with 1 anterodorsal and 1 posterodorsal setae in basal half and 3 apical setae; no ventral setae; hind femur with 1 rather short anterior subapical seta, with elongate dorsal setae in basal third; hind tibia simple, with short setae, 1 anterodorsal and 1 posterodorsal at basal third, 1 dorsal seta at middle; hind basitarsus with 1 short ventral seta at base; tibia and tarsomere (from first to fifth) length (mm): fore leg: 0.48/0.23/0.13/0.09/0.05/0.07, mid leg: 0.63/0.34/0.16/0.11/0.07/0.06, hind leg: 0.74/0.21/0.22/0.12/0.09/0.07. Wing ( Fig. 3). Hyaline, with greyish tinge, veins brown; costa simple, with simple costal setulae; ratio of part of costa between R 2+3 and R 4+5 to that between R 4+5 and M 1+2, 24/14; R 2+3 and R 4+5 diverging towards wing apex; R 4+5 and M 1+2 slightly convex anteriorly, subparallel in distal half; ratio of dm–m to apical part of M 4, 8/35; anal vein week, not reaching wing margin; anal lobe developed; lower calypter small, yellow, with yellow setae; halter yellow. Abdomen ( Fig. 4). Black, cylindrical, with short light setae; terga 4 and 5 bearing very long light setae ventrally, about as long as tergum 5; tergum 6 hidden, glabrous; sternum 4 well developed, with 2 long light setae laterally; sternum 5 divided into 2 rounded sclerites, each bearing very long light setae distally ( Fig. 5); segment 7 concealed in dry specimen; segment 8 black, large, covering about half of left lateral surface of epandrium, covered with short setae; hypopygium ( Fig. 6) black, with small yellow cercus; epandrium black, globular, longer than high; hypandrium basoventral, narrow, straight at apex; phallus simple and narrow; basoventral epandrial lobe short, thick, with few long and short setae and thin process; midventral epandrial lobe digitiform, narrow, with 1 long seta at apex and 1 short seta at base; distoventral epandrial lobe thin, almost reaching apex of surstylus, curved at apex, with short preapical spine; 4 lateral epandrial setae at apex; surstylus small, slightly projected, with 1 thin and 1 thick lobes bearing few short setae; postgonite hidden between surstyli, short, with narrowly divided lobes covered with spicules distally; cercus with long narrow ventral plate (concealed) bearing 7 short simple curved setae in one row; basodorsal cercal plate small, rounded, with 5 very long yellow setae, about half as long as epandrium, and several short setae.

Measurements (mm). Body length 1.5, antenna length 0.5, wing length 1.7, wing width 0.6.

Female. Unknown.

ETYMOLOGY: The species is named after the collector of the holotype, Russian dipterologist Dr. Nikita Vikhrev ( ZMMU) .

DISTRIBUTION. Turkey.

DIAGNOSIS. Micromorphus vikhrevi sp.n. differs from all other species of the genus in unusually long setae on male cercus and segments 4 and 5 of abdomen. The new species keys to M. minusculus and M. mesasiaticus [ Negrobov, 2000; Grichanov, 2007], differing from them in dorsoapical arista-like stylus, shape of cercus, surstylus and epandrial lobes [ Negrobov, 2000: figs 8, 9]. M. minusculus and M. mesasiaticus were described and figured with apical arista-like stylus, short setae on cercus, narrow lobes of surstylus and long basoventral epandrial lobe.