Hynobius geiyoensis Sugawara, Naito, Iwata, and Nagano, 2022

Class: Amphibia > Order: Caudata > Family: Hynobiidae > Subfamily: Hynobiinae > Genus: Hynobius > Species: Hynobius geiyoensis

Hynobius geiyoensis Sugawara, Naito, Iwata, and Nagano, 2022, Bull. Kanagawa Prefect. Mus. (Nat. Sci.), 51: 39. Holotype: HMNHAM-101, by original designation. Type locality: "Nakano, Osakikamijima-cho, Hiroshima Prefecture, Chugoku, Japan [34° 13′ N, 132° 53′ E; elevation = 150 m above sea level (a.s.l.); in all cases, datum = WGS84],". Zoobank publication registration: 1A57B58F-613F-45E5-8AB8-52D90A1DBB53

Hynobius (Hynobius) geiyoensis — Raffaëlli, 2022, Salamanders & Newts of the World: 121.

English Names

Geiyo Salamander (Raffaëlli, 2022, Salamanders & Newts of the World: 121).


Known from Higashihiroshima-shi, Takehara-shi, and Kure-shi in Hiroshima Prefecture, and Imabari-shi in Ehime Prefecture, Honshu, Japan. 

Geographic Occurrence

Natural Resident: Japan

Endemic: Japan


Formerly confused with Hynobius akiensis according to the original publication, where morphometric and mtDNA markers were detailed. Raffaëlli, 2022, Salamanders & Newts of the World: 121, provided an account, summarizing systematics, life history, population status, and distribution (including a polygon map). Tomimori, Matsui, Okawa, Nishikawa, Tanabe, and Kamasaka, 2023, Zootaxa, 5293: 145–160, provided a molecular and morphological reassessment of the species delimitation as well as an expanded description and species account. 

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