When I found this amplexing pair, I recognized them as Dendropsophus but I didn't recognize the species. I assumed it would be easy to look them up, since the white sides and belly marked with inky blackness under the limbs are so distinctive. But it took me a surprisingly long time to track down the identity. This is partly because this species is not in Bartlett's book, which includes the vast majority of frogs that we saw in Peru. Also, the (same) picture in Duellman's two books is taken from a high angle that minimizes the visible amount of white and almost completely hides the black, so I didn't recognize it at first when leafing through. And the recent name change didn't help either.

My Travelogues and Trip Lists page includes a complete list of the herps I saw in the wild on my 2016 MT Amazon Expeditions trip.