The Chile Darwin's frog has a very restricted range in central Chile, being found in Talca Province and southwards to Bío Bío Province, between from 33° 30'S to 37° 50'S.
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It is named after Sir Gilbert Archey (1890–1974), the former Director of the Auckland Institute.
New Zealand's endemic Hochstetter's frog, Leiopelma hochstetteri, is named after Ferdinand.
The Haswell's frog (Paracrinia haswelli) is a small ground frog found around coastal swamps in eastern Australia from around Port Macquarie, New South Wales to the Mornington Peninsula in Victoria.
Its closest living relatives appear to be O. chloronota which occurs to the north of Hose's frog's range, as well as O. livida and O. morafkai with a more limited range in Myanmar and Vietnam, respectively; these four appear to form a close-knit group wherein the northern species are barely closer to each other than Hose's frog is to any of them.
In December 2004, eleven endangered Hochstetter's frogs were found living on Maungatautari in a rocky region.