Evolutionary biology of Hynobius
Chapter 4: Zoogeography
Edited by Masafumi Matsui
indicates the article with listed voucher specimen(s).
Phylogeography of Hynobius yatsui (Amphibia: Caudata) in Kyushu, Japan
Mariko Sakamoto, Atsushi Tominaga, Masafumi Matsui, Kazuhiro Sakata, Akinori Uchino
https://www.doi.org/10.2108/zsj.26.35; Zoological Science 26(1):35-47. January 2009