Neomegadicylus Tselikh, Rasplus & Ku, 2023

Tselikh, Ekaterina V., Rasplus, Jean-Yves, Lee, Jaehyeon & Ku, Deok-Seo, 2023, Neomegadicylus, a new genus of Pteromalidae (Hymenoptera, Chalcidoidea) from the Palaearctic region, Journal of Hymenoptera Research 96, pp. 569-577 : 569

Neomegadicylus Tselikh, Rasplus & Ku gen. nov.

Figs 1-8 , 9-16

Type species.

Neomegadicylus gracileus Tselikh, Rasplus & Ku, sp. nov., by present designation.

Description.

Clypeus smooth and shiny, with lower margin slightly emarginated medially, tentorial pits indistinct (Figs 3 , 10 ); antennal formula 11263, toruli slightly above lower ocular line; F1-F6 longer than broad, antennal clava with large micropilosity area on C1-C3 (Fig. 2 ); gena conspicuously carinate (Fig. 7 ); right mandible with 4 teeth, left with 3 teeth; occiput with carina. Pronotum almost as wide as mesoscutum, with collar margin weakly carinate (Figs 7 , 15 ); prepectus as long as tegula; notauli deep, long but incomplete (Figs 2 , 11 ); scutellum convex and with distinct reticulate frenal area, but without frenal groove (Figs 2 , 11 , 16 ); upper mesepimeron alutaceous or with lower part smooth, upper part alutaceous; metapleuron strongly reticulate; part of propodeum before nucha strongly sloping in lateral view(Fig. 15 ), dorsally with poorly defined converging plicae and large convex nucha (Figs 8 , 16 ). Fore wing hyaline with distinct speculum (Figs 4 , 12 ). Hind coxa dorsally bare. Metasoma lanceolate, on distinct but short smooth cylindrical petiole, Mt2 longer than broad (Figs 6 , 14 ); cerci with setae subequal in length; ovipositor not much protruding.

Remarks.

The new genus is similar to the Australian genus Megadicylus Girault, 1929 ( Bouček, 1988) in having the clypeal lower margin slightly emarginated (Figs 3 , 18 ); antennal formula 11263 (Figs 5 , 13 , 19 ); propodeum in lateral view sloping (Figs 9 , 13 , 17 ), dorsally with converging plicae and large nucha (Figs 8 , 16 , 20 ); cylindrical petiole.

However, Megadicylus Girault (based on observation of non-type female of Megadicylus dubius Girault, 1917, only known species of the genus, collected in Australia and deposited in CBGP) and Neomegadicylus , gen. nov., can be distinguished as follows:

Neomegadicylus - antennal clava with large micropilosity area extending over C1-C3 (Fig. 2 ), F5-F6 much longer than broad (Figs 5 , 13 ); clypeus smooth and shiny medially (Figs 3 , 10 ); notauli deep but incomplete (Figs 2 , 11 ); anterior part of propodeum strongly sloping in lateral view (Fig. 15 );

Megadicylus - antennal clava with small micropilosity area only on C3 (Fig. 19 ), F5-F6 shorter than broad (Fig. 19 ); clypeus radially striate (Fig. 18 ); notauli shallow but complete (Fig. 20 ); propodeum in lateral view not that strongly sloping (Fig. 17 ).

Key to females of Neomegadicylus gen. nov.

1	Propodeum without costula (Fig. 8 ). Mt2 posteriorly emarginate (Fig. 6 ). Antenna with F1 3.25-3.65 times as long as broad (Fig. 5 ). Scape 1.27-1.33 times as long as eye length. Combined length of pedicel and flagellum 1.57-1.75 times breadth of head. Notauli straight (Fig. 2 ). Fore wing with basal cell bare, M 1.94-2.10 times as long as S (Fig. 4 )	N. gracileus Tselikh, Rasplus & Ku, sp. nov.
-	Propodeum with costula (Fig. 16 ). Mt2 posteriorly curved (Fig. 14 ). Antenna with F1 2.45-2.60 times as long as broad (Fig. 13 ). Scape 1.05-1.09 times as long as eye length. Combined length of pedicel and flagellum 1.24-1.30 times breadth of head. Notauli curved (Fig. 11 ). Fore wing with basal cell pilose apically, M 2.60-2.80 times as long as S (Fig. 12 )	N. klarissae Tselikh, Rasplus & Ku, sp. nov.

Figures

Figures 1 - 8. Neomegadicylus gracileus Tselikh, Rasplus & Ku, sp. nov., holotype female (1, 2, 5, 7, 8), paratype female (3, 4, 6) 1 body, lateral view 2 head, dorso-lateral view and mesosoma, dorsal view 3 clypeus, frontal view 4 wings 5 antenna 6 metasoma, dorsal view 7 head and mesosoma, lateral view 8 propodeum, dorsal view.

Figures 9 - 16. Neomegadicylus klarissae Tselikh, Rasplus & Ku, sp. nov., holotype female 9 body, lateral view 10 clypeus, frontal view 11 mesosoma, dorsal view 12 wings 13 antenna 14 metasoma, dorsal view 15 mesosoma, lateral view 16 propodeum, dorsal view.

Figures 17 - 20. Megadicylus dubius Girault, 1917, not type female 17 body, lateral view 18 clypeus, frontal view 19 antenna 20 mesosoma, dorsal view.