Megaodynerus Gusenleitner, 2012

Long, Si-Zhu, Chen, Bin & Li, Ting-Jing, 2025, Taxonomic notes on the rare genus Megaodynerus Gusenleitner, 2012 (Hymenoptera, Vespidae, Eumeninae): a new species from China, with an updated key to all known species, Journal of Hymenoptera Research 98, pp. 1031-1037 : 1031-1037

Genus Megaodynerus Gusenleitner, 2012

Megaodynerus Gusenleitner, 2012: 1048; Bai et al. 2021: 388.

Type species.

Megaodynerus maximus Gusenleitner, 2012 , by subsequent designation of Gusenleitner 2013: 127.

Diagnosis.

This genus is notable for its large size, such as female 16.2–18.0 mm and male 10.5–11.4 mm (Figs 2 , 3 ) (fig. 7 in Gusenleitner 2012; fig. 77 in Bai et al. 2021). It is related to the genus Symmorphus ( Bai et al. 2021) , sharing with the latter by elongate body (Figs 2 , 3 ), mesoscutum posteriorly with two deep longitudinal furrows (Fig. 8 ), and dorsal surface of T 1 with a longitudinal furrow medially (Fig. 11 ). The clypeus of both female and male resembles that of genus Orancistrocerus with a broad clypeus, apex wider than the distance between the inner margins of two antennal sockets (Figs 4 , 7 ). The genus can be separated from the related genus by the following character combination: large body, T 1 (Fig. 11 ) elongate, slightly wider than long (about 1.3 times) and obviously narrower than T 2, anteriorly without transverse raised carina, the transition between anterior and dorsal surfaces round, S 1 with fine striae at narrow part, and A 13 of male recurved, forming a hook-like structure (Fig. 9 ).

Distribution.

China ( Fujian, Hunan and Anhui) and Laos (Fig. 1 ).

Figures

Figure 1. A global geographic distribution map of Megaodynerus.

Figures 2–12. Megaodynerus flavogaster sp. nov., holotype (♀) (2, 4, 5, 6, 8, 11, 12) paratype (♂) (3, 7, 9, 10). 2, 3. Habitus (dorsal view); 4, 7. Head (frontal view); 5. Head (dorsal view) 6 propodeum (dorsal view); 8. Mesosoma (dorsal view); 9. Antenna; 10. Genitalia (dorsal view); 11. Metasoma (dorsal view); 12. Metasoma (ventral view).