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Paedomorphosis in the Ezo salamander (Hynobius retardatus) rediscovered after almost 90 years

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Title: Paedomorphosis in the Ezo salamander (Hynobius retardatus) rediscovered after almost 90 years
Authors: Okamiya, Hisanori Browse this author
Sugime, Ryohei Browse this author
Furusawa, Chiharu Browse this author
Inoue, Yoshihiro Browse this author
Kishida, Osamu Browse this author →KAKEN DB
Keywords: Caudata
Facultative paedomorphosis
Sexual maturity
Artificial fertilization
Issue Date: 8-Dec-2021
Publisher: BioMed Central
Journal Title: Zoological Letters
Volume: 7
Issue: 1
Start Page: 14
Publisher DOI: 10.1186/s40851-021-00183-x
Abstract: Although paedomorphosis is widespread across salamander families, only two species have ever been documented to exhibit paedomorphosis in Hynobiidae. One of these two exceptional species is Hynobius retardatus in which paedomorphosis was first reported in 1924, in specimens from Lake Kuttara in Hokkaido. This population became extinct after the last observation in 1932; since then, no paedomorphs of this species have been reported anywhere. Here, we report the rediscovery of paedomorphs of this species. Three paedomorph-like male salamanders were collected from a pond in the south Hokkaido in December 2020 and April 2021; in size, these specimens were similar to metamorphosed adults but they still displayed larval features such as external gills and a well-developed caudal fin. An artificial fertilization experiment demonstrated that they were sexually compatible with metamorphosed females, thus, confirming them to be paedomorphs. Future efforts to find additional paedomorphs in this and other populations are required to assess the prevalence of paedomorphosis in H. retardatus and to improve understanding of the ecology and evolution of paedomorphisis in Urodela.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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