Corymbas nipponica Takeuchi, 1936

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 : 169

Corymbas nipponica Takeuchi, 1936

Japanese name: Huto-koshijiro-habachi

( Fig. 2N–P )

Material examined. HONSHU: Tochigi Pref.: 1 ˂, Nakagawa, Wami , 33°46′N 140°10′E, coll. larva ( Fig. 2N ), on Sanguisorba officinalis , 12. VI. 2016, mat. 29. VI. ( Fig. 2P ), em. 26. IV. 2017, S. Ibuki .

Larva. Middle instar ( Fig. 2N ): head creamy white; trunk pale, covered with snow-white woolly wax. Late instar ( Fig. 2O ): head dark yellow; trunk pale greenish, covered with snow-white woolly wax; thoracic legs dark yellow. Mature larva ( Fig. 2P ): head dark yellow; trunk pale green, without wax covering.

Host plants. Rosaceae : Rubus spp. ( Okutani, 1967b), Geum japonicum Thunb. ( Okutani, 1967b), Sanguisorba officinalis L. (new record).

Life history. This is a univoltine species with the adult emergence in April to May and the larval feeding stages in May to June in lowlands of central Honshu. The larva is a solitary external feeder of the host leaves ( Fig. 2N–O ). On maturity, the reared larva had an extra molt ( Fig. 2P ) and went into the soil.

Remarks. This is the first record of Sanguisorba officinalis as the host plant of C. nipponica . For a detailed description of the larva, see Okutani (1959).

Figures

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.