Pristimantis croceoinguinis — Santa Cecilia Robber Frog
Some other names for this species:
Orange-groined Rain Frog
The little frogs in the genus Pristimantis are extremely difficult to tell apart without examining their bellies, thighs, chins, etc. I took a number of photos of little Pristimantis frogs perched on leaves in Peru whose identities I'll probably never even have a decent guess of. However, Dick Bartlett thought that this particular little guy looked a lot like P. croceoinguinis, so I'm tentatively identifying it as that species.
Here's another frog that was hard to identify. Comparing this frog to all the described Pristimantis species in the general Iquitos area points me to identifying it as P. croceoinguinis. The one detail that's clearly visible in the photo and differs from the description of that species is the red medial stripe in the iris. I am guessing that this trait is variable in P. croceoinguinis since it isn't mentioned in the references I read, but perhaps I somehow overlooked another candidate, or this frog belongs to some undescribed species.
- Duellman, W.E. 2005. Cusco Amazónico: The Lives of Amphibians and Reptiles in an Amazonian Rainforest