Sergeyoxys Davidian

Davidian, Elena M., 2016, A new genus and new species of subfamily Trioxinae (Hymenoptera: Aphidiidae) from the Far East of Russia, Zootaxa 4205 (5), pp. 475-479 : 476

Sergeyoxys Davidian , gen. nov.

Type species: Sergeyoxys monoceratus Davidian , sp. nov.

Description. Head transverse (dorsal view). Antenna 11-segmented ( Fig. 1 ). Maxillary palp with four segments; labial palp with three segments. Notauli crenulated, present only in anterior one-third of mesoscutum. Propodeum with wide median areola ( Fig. 4 ). Fore wing rather narrow, 3.0 × longer than maximum width, partly with characteristic darkened areas ( Fig. 5 ). Parallel vein (Cu 3) very long, ending almost on end of wing. Basal part of fore wing (until basal vein) covered by sparse and very short setae, remaining part of wing covered by even, denser and long setae, these setae at least twice as long as others. Petiole with weak spiracular and additional lateral tubercles, length of petiole about 3.0 × larger than its width at level of spiracles; petiole from additional tubercles distinctly narrowed towards apex ( Fig. 2 ). Ovipositor sheath subtriangular, weakly elongated, slightly curved down ( Figs. 8–10 ); the stylet of ovipositor (valvula 1 and valvula 2) distinctly and evenly hook-like curved down. Prong present as long unpaired process on ventral side of preapical part of metasoma ( Figs. 8, 9 ). Basal part of prong wide and subtriangular shape, medially with large setiferous pore on its dorsal side ( Fig. 6 ). Narrow part of prong with longitudinal medial furrow dorsally, apically weakly subroundly widened, with short preapical spur on ventral side. According to slide data, wide basal part of prong situated between apex of fifth and base of sixth sternites of metasoma and movably connected with both sternites by elastic membranes.

Comparative diagnosis. This new genus is very similar to the Chinese Parabioxys Shi et Chen, 2001 in having two pairs of lateral tubercles on the sides of petiole and an unpaired prong beginning from the basal part of the last metasomal sternite. The unpaired prong of the new genus is an independent structure separated from the base of the last sternite. The differences between these genera are given in the key below. The prongs of the genus Fissicaudus Starý et Schlinger, 1967 also begins from the basal part of the last metasomal sternite, but they are paired.

Etymology. This genus is named in honour of Russian hymenopterist Sergey A. Belokobylskij, collector of the type material of this new genus.

Figures

FIGURES 1 – 10. Sergeyoxys monoceratus gen. et sp. nov. (female, paratype). 1, Antenna. 2, Petiole. 3, Hind leg. 4, Propodeum and hind coxae. 5, Fore wing. 6, Fifth sternite of metasoma with prong. 7, Hind wing. 8, Apical part of metasoma (lateral view); 9, Apical part of metasoma (ventral view). 10, Ovipositor sheath.