Chalcorana raniceps — Copper-cheeked Frog
Some other names for this species:
This is Borneo's equivalent to the mainland's Chalcorana labialis. The taxonomic history is too confusing for me to repeat here. Note that Chalcorana megalonesa, which is also reasonably widespread in Borneo, looks basically exactly the same except that it is somewhat larger. So any of the frogs I've identified here might really be that species. I've relied on my memory of their sizes to guess which is which.
Hmm, this frog is perhaps a bit of a mystery. Chalcorana raniceps is described on Frogs of Borneo as "a small green frog, sometimes with brown back". To my non-professional eyes, this frog looks extremely similar to C. raniceps in all ways except a total lack of green. But I don't see any other candidates. My best guess is that it is just an unusual color variation of C. raniceps, but who knows?
- Inger, R. F., Stuebing, R. B., Grafe, T. U., Dehling, J. M. 2017. A Field Guide to the Frogs of Borneo, Third Edition
- Wahab, T. B., Das, I., Min, P. Y., Haas, A. 2014. A Photographic Guide to Frogs of Kubah National Park