10:30 〜 10:45
[G-07] A taxonomic study of the genus Gastrancistrus (Hymenoptera: Pirenidae) parasitizing gall midges (Diptera: Cecidomyiidae) in Japan
The genus Gastrancistrus (Hymenoptera: Pirenidae) contains at least 137 species worldwide. Among them, three species, G. fuscicornis, G. sugitama, and G. hakonensis, have been recorded from Japan. During our survey, we reared Gastrancistrus species from six sorts of galls that were induced by Cecidomyiidae (Diptera) in Japan. The present study tried to identify these Gastrancistrus species.The galls were collected from various localities in Japan. The reared parasitoids were kept in the 99% ethanol. Dried specimens were made by the methods described by Matsuo (2020). Voucher specimens were kept in the collections of the Biosystematics Laboratory, Faculty of Social and Cultural Studies, Kyushu University, Fukuoka, Japan. Morphological examination revealed that at least two Gastrancistrus species, Gastrancistrus sp. 1 and Gastrancistrus sp. 2 that were reared from Daphnephila machilicola and Pseudasphondylia neolitseae (Diptera: Cecidomyiidae) were undescribed. In this presentation, we introduce their diagnostic characters.