Rovnoholoneurus Fedotova et Perkovsky, 2017

Fedotova, Z. A. & Perkovsky, E. E., 2017, New Genus And Species Of Gall Midges (Diptera, Cecidomyiidae: Porricondyinae, Holoneurini) From The Late Eocene Amber Of Olevsk (Zhitomir Region, Ukraine), Vestnik Zoologii (Vestn. Zool.) 51 (1), pp. 23-30 : 24-25

Genus Rovnoholoneurus Fedotova et Perkovsky , gen. n.

urn:lsid:zoobank.org:act:CDD03952-9506-4EC9-841A-C28C89AF6F56

T y p e s p e c i e s: Rovnoholoneurus davidi Fedotova et Perkovsky , sp. n.

D e s c r i p t i o n ( figs 1–4 ). Body slightly shorter than wing. Head elongate; eyes fused, wide bridge positioned on 2/3 part of head, occiput wide, rounded. Head basally with very long setae. Male antenna 2+11-segmented; female antenna 2+10–11-segmented; scape slightly enlarged apically; flagellomeres narrow, basal enlargement with constriction near base or middle, neck prolonged (in male and female), necks of distal flagellomeres much shorter than those of medial ones. Basal enlargement with whorls of long setae of different sizes, especially with long setae in basal, medial whorls. 10th flagellomere sometimes fused, consisting of two segments. Proximal flagellomeres slightly longer than distal ones. Last flagellomere ovoid or conical, without apical projection. All female flagellomeres bearing two rings of sensorial filae with apical, basal round loops. Mouthparts strongly elongated, wide. Palpus 4-segmented, longer than head, with segments slender, almost parallel-sided, 4th segment longest. Scutellum strongly swollen. Wing longer than body, evenly and very strongly widened distally; vein R 5 almost straight, slightly curved near apex, joining margin almost at wing tip; rs strong, short; vein m+rm slightly curved; Cu 2 strongly developed, positioned far from margin of wing, but fork indistinct, not fused, with two poorly visible folds near CuA 2; vein CuP well developed. Legs with long setae ventrally. Abdomen slightly swollen near base, narrowed apically. Abdominal segments covered by very long setae. Ovipositor consisting of one pair of dorso-apical plates.

C o m p a r i s o n. The new genus appears closely related to Holoneurus Kieffer, 1894 ( Mamaev, 2001; Fedotova, Sidorenko, 2007), as evidenced by the body shape, 2+10–11-segmented antennae, long legs, and male and female flagellomere morphology. It differs from Holoneurus in the following characters: wide eye bridge, wing venation, elongated and swollen mouthparts, palpi very thin and much longer than head, different shape of flagellomeres, vein R 5 joining wing margin at apex, m+rm curved, vein rs very short, M 3 absent, CuA 2 well developed and reaching near wing margin, male hind femur longer than tibia, tarsi very long (almost as long as or longer than femur+tibia), long setae on ventral side of legs, and smaller body.

S p e c i e s i n c l u d e d. Rovnoholoneurus davidi sp. n., R. miyae sp. n., R. laqueatus (Fedotova, 2005) , comb. n. (for Bryocrypta laqueata Fedotova in: Fedotova, Perkovsky, 2005). All species are only known from Rovno amber.

E t y m o l o g y. The generic name is formed from a combination of Rovno and the gall midge generic name Holoneurus . Gender masculine.

Figures

Fig. 1. Rovnoholoneurus davidi, male, holotype SIZK, OL-8: 1 — general appearance; 2 — head and antenna; 3 — flagellomeres 10–11; 4, flagellomere 5; 5 — mouth parts and palpi; 6 — the abdomen and part of the thorax with swollen scutellum. Scale bar 0.1 mm.

Fig. 2. Rovnoholoneurus davidi, male, holotype SIZK, OL-8: 1 — general appearance (×20); 2 — head, scapus, pedicel and palpi (×127); 3 — flagellomeres 10–11 (×140); 4 — flagellomere 5 (×165); 5 — head and antenna (×57.4); 6 — head, palpi and notum with swollen scutellum (×100); 7 — veins of the base of the wing: C, R1+2, R, m+rm, rs, CuA1 (×80); 8 — veins CuA1, CuA2 and fold of wing (×109); 9 — abdominal tergites 4–8 (×60); 5 10 — palpi (×155); 11 — middle leg (×60).

Fig. 3. Rovnoholoneurus miyae, female, holotype SIZK, OL-2: 1 — general appearance; 2 — mouth parts and palpi; 3 — flagellomeres 8–10; 4 — flagellomeres 4–6; 5 — scapus, pedicel, flagellomeres 1 and 2; 6 — abdomen distally; 7 — apex of abdomen and ovipositor. Scale bar, 0.1 mm.

Fig. 4. Rovnoholoneurus miyae, female, holotype SIZK, OL-2: 1 — head and antenna (×69); 2 — apex of abdomen and ovipositor (×360); 3 — fore tarsi (×39); 4 — general appearance (×30.6); 5 — head, palpi, scapus, pedicel, flagellomeres 1 and 2 (×90); 6 — distal portion of the abdomen (×90); 7 — flagellomeres 8–10 (×180); 8 — flagellomeres 4–6 (×190).