Gurvaniella Kovalev, 1986

Lukashevich, Elena D. & Blagoderov, Vladimir A., 2020, Review of Mesozoic Perissommatidae (Insecta: Diptera), Zootaxa 4718 (4), pp. 481-496 : 493

Gurvaniella Kovalev, 1986

( Figures 7C , 8E, F )

Gurvaniella: Kovalev 1986: 127 .

Type species. Gurvaniella hosbayari Kovalev, 1986 ( Gurvan-Eren , Mongolia, K 1)

Species included. Monotypic.

Remarks. The holotype of G. hosbayari (PIN, No. 3149/1789) was re-studied by us. Antenna are, as usually in the family, rather short and stout, with 11 segments, flagellum not clearly differentiated, segment 2 (pedicel) longest, all segments with fine setae only. In the original description of this male Kovalev (1986) noted differences in the size of facets, with anterior smaller ones, together with a broad frons. However, re-examination of the holotype ( Fig. 8E ) and its comparison with the new genus described herein ( Fig. 5A, B ) showed that the ventral side of the head is visible and the eyes could be holoptic in Gurvaniella , and the ocelli are also not visible. Kovalev included Gurvaniella only in superfamily Perissommatoidea based on eye pattern (different from living Perissomma ), together with unusually large size and poorly preserved wing venation of the holotype, but new data allow us to include the genus into Perissommatidae (see Discussion).

Figures

FIGURE 5. C.gnoma gen. et sp. nov. A–C. Paratype PIN No. 5340/2982, male. A, B. Ventral and dorsal view of head (part and counterpart). C. Leg. D, E. Holotype PIN No. 5026/201, male, total view and terminalia. F–H. Paratype PIN No. 5340/2981, female. F. Antenna. G. Cerci. H. Total view. Scale bars 200 μm (A, B, C, E, F, G), 1 mm (D, H).

FIGURE 7. Mesozoic Perissommatinae (modified originals of V.G. Kovalev). A–B.?Palaeoperissomma demetrii Kovalev, 1990, holotype PIN No. 1742/667 (Turga, K1). A. Total view. B. Antenna. C. Total view of Gurvaniella hosbayari Kovalev, 1986, holotype PIN No. 3149/1789 (Gurvan, K1). Scale bars 1 mm. Figs A, B after Kovalev 1990: fig. 105a, b; Fig C after Kovalev 1986: fig. 97a.

FIGURE 8. Mesozoic Perissommatinae. A, B. Head and total view of Palaeoperissomma collessi Kovalev in Kalugina & Kovalev, 1985, PIN No. 1255/1341 (Kubekovo, J2). C, D. Head and total view of?Palaeoperissomma demetrii Kovalev, 1990, holotype PIN No. 1742/667 (Turga, K1). E, F. Head and total view of Gurvaniella hosbayari Kovalev, 1986, holotype PIN No. 3149/1789 (Gurvan, K1). Scale bars 200 μm (A, C, E), 1 mm (B, D, F). Abbreviations: e, eye; f, vein-like fold; o, ocelli.