Funding for this research was provided by:
Fujiwara Natural History Foundation
Received: 17 July 2020
Revised: 6 October 2020
Accepted: 15 October 2020
First Online: 14 November 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: No animal testing was performed during this study.
: All necessary permits for sampling have been obtained by the authors.
: All material used in this study is deposited in the Zoological Collection of Kyoto University (KUZ).
: SF, TK, and SO collected the material used in this study. SF and RMK observed the material. SF and HY prepared the figures. All authors contributed in preparing the manuscript.