Hynobius retardatus Dunn, 1923
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Hynobius retardatus
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Open encyclopedia reference
The Ezo salamander (Hynobius retardatus), also known as the Hokkaido salamander, Noboribetsu salamander, or Ezo Sanshouo in Japanese is a species of salamander in the family Hynobiidae. Prior to 1923, the species was also classified by the binomial scientific name Satobius retardatus. H. retardatus is endemic to Japan's northernmost prefecture, the island of Hokkaido. The species is a pond-type salamander, and its natural habitats are temperate forests, temperate shrubland, swamps, freshwater marshes, intermittent freshwater marshes, freshwater springs, irrigated land, canals, and ditches.
In 1923, the species was discovered by American herpetologist Emmett Reid Dunn, the same year the Hida and Amber salamander species were discovered. H. retardatus was first observed on the eastern edge of the Noboribetsu region within Lake Kuttara (Kuttara-ko), although this specific population is now extinct. The name Ezo comes from Yezo, the old name of Hokkaido.
Wikipedia contributors, Ezo salamander; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T16:30:30.527222+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Hynobius retardatus Dunn, 1923
- Name authority
- Dunn, 1923
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Amphibia
- Order
- Caudata
- Family
- Hynobiidae
- Genus
- Hynobius
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classAmphibia
- orderCaudata
- familyHynobiidae Cope, 1859
- subfamilyHynobiinae Cope, 1859
- genusHynobius Tschudi, 1838
- speciesHynobius retardatus Dunn, 1923
Close classified relatives
These entries share the source’s genus, Hynobius. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Hynobius abei Sato, 1934 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius amakusaensis Nishikawa & Matsui, 2014 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius arisanensis Maki, 1922 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius bakan Matsui, Okawa & Nishikawa, 2019 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius chinensis Günther, 1889 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius hidamontanus Matsui, 1987 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius hirosei Lantz, 1931 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius leechii Boulenger, 1887 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius utsunomiyaorum Matsui & Okawa, 2019 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius vandenburghi Dunn, 1923 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius yiwuensis Cai, 1985 | HynobiidaeChordata | Accepted speciesRecorded extant |
| Hynobius turkestanicus Nikolskii, 1910 | HynobiidaeChordata | Accepted speciesRecorded extant |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Satobius retardatus (Dunn, 1923) (Dunn, 1923) | synonym |
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=668220 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:6MQL6. Classification follows source parent identifiers. English common names may vary by region.