Perineura pictipennis Takeuchi, 1959

Kumar, Deepthi S & Sankar, Manimuthu M, 2023, Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan VIII, Bulletin of the National Museum of Nature and Science. Series A, Zoology 49 (2), pp. 57-74 : 70

Perineura pictipennis Takeuchi, 1959

Japanese name: Iwagarami-habachi

( Fig. 11 )

Larva. Middle instar ( Fig. 11A ): Head very pale olive, with large black spot around stemmatum; trunk greenish creamy white. Late instar ( Fig. 11B ): Head pale olive, with large black spot around stemmatum; trunk pale greenish white, with very sparse minute whitish tubercles dorsally. Mature larva ( Fig. 11C ): Entirely vivid pale green, shiny.

Material examined. HONSHU: Tochigi Pref.: 1 $, Sakura, coll. larva on Hydrangea hydrangeoides , 16. V. 2019, mat. 3. VI., em. 3. V. 2020, S. Ibuki; 1 $, Nakagawa, Wami, 36°46′N 140°10′E, coll. larva on Hydrangea serrata var. serrata , 30. V. 2020, mat. 22. VI., em. 29. III. 2021, S. Ibuki; 1 $ ( Fig. 11D ), Nakagawa, Wami, 36°46′N 140°10′E, coll. larva on Hydrangea serrata var. serrata , 30. V. 2020, mat. 10. VI., em. 30. III. 2021, S. Ibuki.

Host plants. Hydrangeaceae : Hydrangea hydrangeoides (Siebold et Zucc.) B.Schulz ( Okutani, 1967); Hydrangea serrata (Thunb.) Ser. var. serrata (new record).

Life history. As shown in the label data above, the larvae were found feeding on the host leaves in May to June in Sakura and Nakagawa, Tochigi Prefecture. They matured in June and went into the soil. The larvae were solitary leaf feeders, not coiled at rest. The adults emerged in spring next year. This is regarded as a univoltine species.

Remarks. Okutani (1967) recorded Hydrangea hydrangeoides as the host of this species, but nothing has been published about the larva and life history of the species.

Figures

Fig. 11.ɹPerineura pictipennis. A, Two larvae on Hydrangea serrata var. serrata, Wami, 30. V. 2020; B, larger larva in A, late instar, 7. VI. 2020; C, another smaller larva in A, matured, and cast skin, 23. VI. 2020; D, female adult, same individual as B, emerged, 30. III. 2021. Photographed by Ibuki.