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The western spotted frog, Heleioporus albopunctatus, is a large, heavily built burrowing frog of southwestern Australia, named for the pale spotting across its dark back. It is endemic to southwest Western Australia, occurring from around Galena south through the wheatbelt and the Darling Range and east to Jerramungup.
Identification
H. albopunctatus is a large frog, reaching up to about 100 mm (10 cm) in body length, among the biggest frogs in its region. Its bulky body and strong limbs suit a burrowing lifestyle rather than an aquatic one: like other members of its genus, it spends much of its life underground and only emerges to breed. The dark, mottled back carries the pale spotting that gives the species its common name, a pattern that helps distinguish it from smoother-skinned frogs sharing its range.
Habitat and range
The species occupies a broad set of habitats across the southwest, including claypans and sandy-soil areas near water in dry woodland, as well as forests, shrublands, intermittent rivers, freshwater marshes, rocky areas, granite outcrops, farmland and roadside ditches. This tolerance for disturbed and agricultural land has let it persist alongside farming in the wheatbelt, though it is threatened locally by habitat loss and increasing salinity, pressures tied to land clearing and dryland salinity across its southwestern Western Australian range.
Behaviour and breeding
Breeding in H. albopunctatus is built around a burrow rather than open water. Males dig burrows in sandy substrate near temporary water bodies, excavating up to 1 m deep, and call mainly in April, also in March and May, advertising from underground rather than from the water’s edge. After amplexus inside the burrow, females lay a foamy egg mass that develops into mid-stage tadpoles still sealed inside the burrow before winter rains arrive, with a mean clutch size of around 391 eggs. The burrow then floods with winter rain, after which the tadpoles can reach a total length of up to 6.5 cm and take roughly four to five months to develop into frogs. This burrow-first strategy lets breeding begin well before surface water is available, timing hatching and growth to the region’s seasonal rains.
Conservation
The facts box carries the species’ current IUCN Red List category, Least Concern. Its broad range across the southwest and its ability to persist in farmland and roadside ditches alongside more natural habitat help explain this status, even as localised habitat loss and rising salinity continue to affect some populations within its range.
Similar species
The western spotted frog’s large size, burrowing habit and underground breeding set it apart from most frogs sharing its southwestern Australian range, where fully aquatic breeders that call and lay eggs in open water are far more common. Other species in the genus Heleioporus share the same burrow-and-flood breeding strategy, but none of their profiles are yet published on this site, so no direct comparison page is available here.