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Hokkaido Salamander

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description Hokkaido Salamander Overview

Hynobius retardatus is a salamander in the family Hynobiidae, endemic to Hokkaido, Japan's northernmost main island. Adults are dark brown to grayish with irregular lighter mottling, reaching total lengths of approximately 13 to 18 centimeters. The species breeds in cold snowmelt pools and slow-moving streams during late winter and early spring, when females deposit paired egg sacs in the water. It is adapted to cold-temperate climates and hibernates during winter months in terrestrial shelters beneath logs or underground.

help Hokkaido Salamander FAQ

Where does the Hokkaido Salamander live?

Hynobius retardatus is endemic to Hokkaido, Japan's northernmost main island, where it inhabits forests and breeds in ephemeral pools and small streams. It does not occur naturally on any of Japan's other main islands.

When does the Hokkaido Salamander breed?

Hynobius retardatus breeds in late winter to early spring, when snowmelt fills temporary pools and streamside depressions with cold water. Adults emerge from hibernation to deposit egg sacs in these near-freezing aquatic environments.

What family does the Hokkaido Salamander belong to?

The Hokkaido Salamander belongs to the family Hynobiidae, a group of salamanders found primarily in Asia and considered one of the most primitive lineages of living salamanders. Hynobiids are distinct from the Plethodontidae (lungless salamanders) that dominate in the Americas.

Is the Hokkaido Salamander threatened by non-native species?

Hynobius retardatus faces pressures from habitat loss and the introduction of non-native salamander species on Hokkaido, which can compete with or prey upon it. Its dependence on temporary snowmelt pools for breeding also makes it vulnerable to climate-driven changes in precipitation patterns.

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