Euodynerus dantici violaceipennis Giordani Soika, 1973

Tran, Tien Van, Vu, Thuong Thi, Nguyen, Cuong Quang & Nguyen, Lien Thi Phuong, 2025, Contribution to the knowledge of the potter wasp genus Euodynerus Dalla Torre, 1904 (Hymenoptera, Vespidae, Eumeninae) from Vietnam, with description of a new species and a key to the Oriental fauna, Journal of Hymenoptera Research 98, pp. 467-482 : 467-482

Euodynerus dantici violaceipennis Giordani Soika, 1973

Fig. 1 A – E

Odynerus dantici ; von Schulthess 1934: 75.

Euodynerus dantici violaceipennis Giordani Soika 1973: 114.

Material examined.

2 ♀, 4 ♂, Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NP , 22°16'65"N, 108°11'08"E, 12 Aug. 2020, Nguyen Thi Phuong Lien et al leg.

Male genitalia.

As in Fig. 1 A – E . SVIII ~ 1.9 × as long as wide (at widest part), with basal margin slightly convex (Fig. 1 A ). Parameral spine without setae. Volsella flattened, spatulate, wide from inner aspect, without setae at top (Fig. 1 B ). Digitus quite thick, exceptionally wide from base to near apex, ~ 2.5 × as long as wide (at widest part), with exceptionally dense, long setae on its surface and left lateral margin, with sides almost parallel from the base then abruptly tapering near the top to form pointed apex (Fig. 1 C ). Penis valves long, much longer than basal apodeme (~ 1.7 × as long as basal apodeme); in ventral view, proximal part strongly produced laterally into an almost square corner (Fig. 1 D ); in lateral view, apical part strongly produced into a sharp-pointed lobe (Fig. 1 E ), dorsal rod shorter than basal apodeme.

Remarks.

It was mentioned by Ma et al. (2017) that E. carinatus Ma, Chen, & Li differs from E. dantici and other congeners by the clypeus distinctly longer than its width in both sexes, clypeus of female with an extremely strong longitudinal carina, cephalic fovea with dense setae, apex of FXI of male bent backward reaching the base of FVIII, and the volsella of the male wide but narrowed apically (wide apically in E. dantici ). We examined specimens of E. dantici (Rossi, 1908) from Vietnam and found that E. dantici has a clypeus that is also longer than wide, with a strong longitudinal carina, and the shape of the digitus is quite similar to that of E. carinatus (fig. 3 in Ma et al. (2017) in that the digitus is wide but narrow apically (Fig. 1 C ). The only character different between E. dantici and E. carinatus is that the apex of FXI of the male is bent backward to reach the middle of FVIII. In the future, carefully dissecting and examining the male genitalia of E. carinatus to determine the precise shapes of the digitus and penis valve will be needed, and for comparison with those of E. dantici , as these could be synonyms. For present, we leave the status of E. carinatus as it is but note the potential for synonymy in the future.

Distribution.

China: Jiangsu, Guangdong, Hong Kong; Vietnam (new records: Bac Kan); Taiwan; Korea; Japan (including Ryûkyû Islands).

Figures

Figure 1. Euodynerus dantici violaceipennis Giordani Soika, 1973. Male genitalia A SVIII, dorsal view B inner aspect of paramere with volsella and digitus C digitus D aedeagus, ventral view E aedeagus, lateral view. Scale bars: 0.5 mm (A, B); 1 mm (C, D, E).