Onycholyda esakii ( Takeuchi, 1930 )

Bourke, Joanna, 2024, Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan IX, Bulletin of the National Museum of Nature and Science. Series A, Zoology 50 (1), pp. 19-32 : 22-23

Onycholyda esakii ( Takeuchi, 1930)

Japanese name: Esaki-hirata-habachi

( Fig. 2D, E )

Distribution. Japan (Honshu, Shikoku, Kyushu).

New record from Tottori Prefecture (see Remarks below).

Host plant. Rosaceae : Rubus crataegifolius Bunge ( Shinohara and Kojima, 2009), R. peltatus Maxim. (new record; see Remarks below).

Remarks. Shinohara and Kojima (2009) reported on the bionomics of this sawfly. On September 2, 2023, Shinohara found two leaf-rolls of pamphiliid larvae on a leaf of R. peltatus ( Fig. 2D, E ) in Kagamiganaru, Tottori Prefecture. The leaf-rolls contained one larva each, and the larvae were identified as O. esakii when they matured on September 7. The mature larvae were well characterized by the head black and the prothoracic shields and the last abdominal segment without black areas and perfectly agreed with O. esakii as described by Shinohara and Kojima (2009). This observation represents the first distribution record of O. esakii from Tottori Prefecture and the first host plant record of R. peltatus for the species.

Figures

Fig. 2.ɹOnycholyda viriditibialis (A–C) and O. esakii (D, E), photographed in Kagamiganaru by A. Shinohara on September 2, 2023. — A, Larval abode (arrowed), upper surface; B, same abode (arrowed), under surface; C, late-instar larva in abode with frass; D, two larval abodes (arrowed), under surface; E, close-up of larval abodes.