Diplolepis, Geoffrey, 1762

Fang, Zhiqiang, Hu, Wenqian, Mccormack, Koorosh, Pos, Davide Dal, Tang, Chang-Ti, Zhu, Ying, Mao, Kangshan, Stone, Graham N. & Zhang, Y. Miles, 2025, New species of rose gall wasp Diplolepis Geoffroy, 1762 (Hymenoptera: Diplolepididae) and its parasitoid Orthopelma Taschenberg, 1865 (Hymenoptera Ichneumonidae) on a rare endemic rose species in Sichuan, China, Zootaxa 5706 (2), pp. 231-246 : 238

Key to the species of known Chinese Diplolepis (modified from Zhu et al. 2021)

1 Radial cell relatively long, at least 2.5× longer than broad..................................................... 2

- Radial cell shorter, around 2.0× longer than broad........................................................... 3

2 Radial cell closed, with infuscate veins and 2r vein without projection into the radial cell. Malar distance long, around 0.75× as long as height of compound eye............................................ D. flaviabdomenis Wang, Liu & Chen

- Radial cell partially open in anterior margin, without infuscate veins and 2r vein with a projection into the radial cell. Malar distance shorter, around 0.5× as long as compound eye height........................... D. abei Pujade-Villar & Wang

3 Head strongly transverse in frontal view, at least 1.7× wider than high........................................... 4

- Head trapezoidal in frontal view, at most 1.5× wider than high.................................................. 5

4 Vertex and mesoscutum smooth and shining. Occiput coarsely punctured......................... D. japonica (Walker)

- Vertex and mesoscutum distinctly alutaceous to coriaceous. Occiput coriaceous......................... D. nr japonica

5. Head slightly wider than mesosoma ( Fig. 3B ). Median mesoscutal line present, shallowly impressed, about 1/2 of the entire length of mesoscutum ( Fig. 3B ). Areolet present or inconspicuous. Occiput rugose to coriaceous ( Fig. 3B ). Propodeum sparsely setose ( Fig. 5D )..................................................................................... .. 6

- Head distinctly narrower than mesosoma. Median mesoscutal line absent or only present by a very short depression (extending over 1/10 of mesoscutum length). Areolet present and large. Occiput smooth and shining with striae. Propodeum densely pubescent........................................................................................... 7

6. Areolet inconspicuous. Frons and occiput coriaceous.......................... D. valtonyci Zhu, Wang & Pujade-Villar

- Areolet present and large ( Fig. 4B ). Frons and occiput rugose to coriaceous ( Fig. 3B ). China.............. D. nezha sp. n.

7. Antennae 12-segmented, with scapus and pedicel yellowish-brown. POL around 2.0× longer than OOL. Parapsidal lines absent, almost invisible. Radial cell closed. Third and following metasomal tergites with distinct punctures dorsolaterally.............................................................................. D. hunanensis Wang, Rui, Liu & Chen

- Antennae 14-segmented, with scapus and pedicel black. POL around 3.0× longer than OOL. Parapsidal lines distinct and extending almost the entire length of mesoscutum. Radial cell completely open in margin. All metasomal tergites without punctures......................................................... D. minoriabdomenis Wang, Rui, Liu & Chen

Figures

FIGURE 3. Diplolepis nezha. A) Lateral habitus. B) Head + mesosoma in dorsal view. C) Antenna.

FIGURE 4. Diplolepis nezha. A) Dorsal habitus. B) Fore wing.

FIGURE 5. Diplolepis nezha. A) Head in frontal view. B) Scutellum. C) Metasoma in lateral view. D) Propodeum. E) Mature galls. F) Dissected gall with mature larva.