Apethymus kunugi Togashi, 2005

Fu, Yuanzun, Yuan, Yuan, Shen, Qian, Xu, Hao, Ye, Zheng, Guo, Li, Wu, Xiaoliang & Zhao, Yunhe, 2021, Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan VI, Bulletin of the National Museum of Nature and Science. Series A, Zoology 47 (4), pp. 163-188 : 168

Apethymus kunugi Togashi, 2005

New Japanese name: Kunugi-habachi ( Figs. 1D , 2K–M )

Material examined. HONSHU: Tochigi Pref.:

1˂ ( Fig. 1D ), Koisago, 36°46′N 140°08′E, Nakagawa, coll. larva ( Fig. 2K–L ), on Quercus serrata , 10. V. 2019, mat. 17. V. ( Fig. 2M ), em. 18. X. 2019, S. Ibuki .

Larva. Late instar ( Fig. 2K–L ): head dark opaque gray; trunk and legs creamy white, dorsal region dark gray with creamy white line along middorsal line and each thoracic and abdominal segment with blackish spot in laterodorsal region. Mature larva ( Fig. 2M ): head pale orange; trunk and legs yellowish white, dorsal region dark gray, each segment with blackish spot in laterodorsal region.

Host plants. Fagaceae : Quercus acutissima Carruth. ( Togashi, 2005), Q. serrata Murray (new record).

Life history. This is a univoltine species with the adult emergence in autumn, hibernation in the egg stage, and the larval feeding stages in spring. The larva is a solitary external feeder of the host leaves ( Fig. 2 L ). On maturity, the reared larva had an extra molt ( Fig. 2M ) and went into the soil.

Remarks. Togashi (2005) described this species from the holotype which was reared from a larva feeding on Q. acutissima ( Togashi, 2005) , but he did not give any further information about the larva and life history. Here we newly record Q. serrata as a host of A. kunugi . Other species of Quercus may also serve as the host of this sawfly.

Figures

Fig. 1. A, Late instar larva of Sterictiphora nipponica, 25. V. 2015, photographed by Ibuki. B, Phylloecus etorofensis, female, photographed by Hara. C, Dead female of Tremex apicalis on trunk of Alnus japonica, 23. V. 2021, photographed by Shinohara. D, Apethymus kunugi, female, photographed by Hara.

Fig. 2. A–F, Aglaostigma albicinctum: A, early or middle instar larva on Symplocarpus renifolius, 31. V. 2018; B, early or middle instar larva on Impatiens textorii, 29. V. 2016; C, late instar larva on Actinidia polygama, 25. VI. 2016; D, late instar larva on I. textorii, 30. V. 2016; E, late instar larva on A. polygama, 1. VII. 2016; F, mature larva, 10. VI. 2016. G–J, Allantus meridionalis: G, early instar, 20. IX. 2015; H, J, middle or late instar larva, 12. X. 2015; I, mature larva, 13. X. 2015. K–M, Apethymus kunugi: K, probably late instar larva, 10. V. 2019; L, same larva, 12. V. 2019; M, same larva, matured, and cast skin above, 17. V. 2019. N–P, Corymbas nipponica: N, middle instar larva, 17. VI. 2016; O, same larva, late instar, 26. VI. 2016; P, same larva, matured, and cast skin above, 29. VI. 2016.All photographed by Ibuki.