Fagineura parva Hara, 2020

Ryoo, Seung-Woo, Min, Jin-Young, Son, Seok-Yoon, Choi, Baek-Yong, Choi, Juho & Min, Kyoung-Bok, 2022, Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan VII, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (4), pp. 193-213 : 207

Fagineura parva Hara, 2020

New Japanese name: Hime-buna-habachi

( Fig. 9 )

Fagineura parva Hara, 2022 , in Hara and Ibuki, 2022: 231 .

Additional description. This species was known only from one female (holotype) and one male ( Hara and Ibuki, 2022). The additional female ( Fig. 9A–C ) slightly differs from the holotype as follows: mesepisternum black, ventrally dark brown; head with length behind lateral ocellus 2.7× length of lateral ocellus; OOL: POL: OOCL 1.1: 1.0: 1.0; malar space 0.5× as long as median ocellus width; flagellomere 2 1.2× as long as flagellomere 1; hind tibia with posterior spur 1.2× as long as apical breadth of tibia in lateral view.

Larva. Final feeding (semifinal) instar ( Fig. 9D ): length 12 mm; head pale brown, slightly darkened laterally and on mouth part; trunk pale green; thorax with small dark green spots; thoracic legs pale yellow white; proleg present on abdominal segments 2–8 and 10; anal tergum without caudal protuberance. Final instar ( Fig. 9E ): head brown yellow; trunk and thoracic legs pale yellow.

Material examined. Honshu: Tochigi Pref.: 1 $, Nakagawa, Bato , 36°45′N 140°10′E, coll. larva on Fagus japonica , 14. V. 2021, mat. 15. V., em. 19. IV. 2022, S. Ibuki ( Fig. 9 ) .

Host plant. Fagaceae : Fagus japonica Maxim. (new record).

Life history. A solitary larva was collected in middle May in Nakagawa, Tochigi Prefecture. The larva had an extra molt before maturity. The mature larva entered the soil and the adult emerged the next year. This sawfly has one generation per year.

Remarks. The host plant of this species is recorded for the first time. The final feeding instar larva of this species may be distinguished from that of Fagineura crenativora Vikberg and Zinovjev, 2000 , another congener associated with Fagus , by the paler color (compare Fig. 9D with fig. 4F, G in Shinohara et al., 2000).

Figures

Fig. 9. Fagineura parva: A–C, Female, head in anterior view, whole body in dorsal and ventral views; D, final feeding instar larva, 14. V. 2021; E, final instar larva, 15. V. 2021. A–C, Photographed by Hara; D, E, photo- graphed by Ibuki.