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Hallowell’s tree frog, Hyla hallowellii, is a member of the true tree frog genus Hyla found only in Japan. It was described by Joseph Cheesman Thompson in 1912, from a type specimen collected on Kikai Island, and its common name honours the American herpetologist Edward Hallowell. The species is endemic to Japan, with no confirmed populations elsewhere.
Identification
Openly accessible sources do not give measurements or a detailed description of Hallowell’s tree frog, so no size or colour figures appear here; the facts box carries only what is confirmed. In photographs held by Wikimedia Commons, it shows the slender, green-bodied build typical of the genus Hyla, the same general body plan as the European tree frogs on this site.
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Habitat and range
The species occupies subtropical or tropical moist lowland forests and shrubland, freshwater marshes, ponds, irrigated land, canals, ditches and degraded former forest across its Japanese range, favouring the same still, vegetated water that most Hyla species need to breed. Its range runs from natural wetland and forest edge into rice paddies, canals and other farmed land, suggesting some tolerance of human-modified habitat alongside its natural one.
Behaviour and breeding
Little about this species’ calls, breeding season or tadpole development is documented in openly accessible, English-language sources; a dedicated account has not been published on Animal Diversity Web, and AmphibiaWeb’s and the IUCN Red List’s own accounts cannot currently be opened to check. What is established is only its habitat choice, a dependence on standing or slow-moving fresh water that suggests pond- and ditch-breeding behaviour typical of its genus. No documented detail is specific to H. hallowellii itself.
Conservation
The facts box carries the species’ current IUCN Red List category, Least Concern, reflecting a range that still includes natural wetland and forest habitat as well as farmed land such as rice paddies and irrigation canals; the species is not confined to a single, shrinking site.
Similar species
No look-alike sharing Hallowell’s tree frog’s Japanese range is documented in the sources checked for this profile. Further afield, the European tree frog (Hyla arborea) and its Hyla relatives on this site share the same slender, green-bodied genus-level build, though they live thousands of kilometres away and are not found alongside H. hallowellii in the wild.