Hynobius formosanus—the Formosan salamander—is a Taiwan‑endemic hynobiid inhabiting cold headwaters and mossy montane forests. Mostly nocturnal and secretive, it shelters under stones, logs and within crevices.
Ecology & Biology
Diet: small arthropods (insect larvae, isopods, springtails) taken among moss and leaf litter.
Reproduction: external fertilisation; females attach paired gelatinous egg sacs beneath stones/wood in cool pools or slow stream runs. Larvae are stream‑dwelling with external gills and metamorphose after months to ~1 year.
Seasonality: breeding in late winter–spring; strong dependence on cold, well‑oxygenated water.
Identification
Form: small–medium hynobiid with distinct costal grooves.
Colour: dark brown to blackish with fine pale speckling; paler venter.
Limbs/Tail: short limbs; laterally compressed tail aiding swimming.
Size & Longevity
Total length: typically 8–12 cm, up to ~14–15 cm.
Life: roughly 6–12 years (wild estimate).
Range & Habitat
Montane Taiwan (e.g., Hehuanshan and adjacent ranges) around 2,000–3,000 m, in spring‑fed headwaters, seepage pools and humid conifer–broadleaf forests; typically under stones, moss and woody debris.
Conservation & People
Threats: road/recreation disturbance, stream modification and water‑quality change, habitat fragmentation and climate warming.
Measures: protected in parks/reserves and by Taiwanese law; avoid trampling/stone‑turning in headwaters.
IUCN: Near Threatened (NT) (check latest assessment).
