I think this is Adenomera hylaedactyla, though this species is hard to distinguish from Adenomera andreae, which also lives in this area. One difference is the length of the snout compared to the width of the eye (shorter snout in A. andreae); another difference is the typical habitat (open areas for A. andreae, forests for A. hylaedactyla); a third difference is the sound of the male's call. I didn't hear the call, and this one was at the edge of a thin trail through the forest, so not much help there. But the snout looks long-ish to me, so I'm calling it A. hylaedactyla until I hear otherwise.

Here is a complete list of the herps I saw in the wild on my 2014 MT Amazon Expeditions trip.

This one was deep into the primary forest at Madre Selva, so it seems safe to assume that it is A. hylaedactyla rather than A. andreae. I also heard thirdhand that the orange stripe is a known feature of some individuals of A. hylaedactyla.

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.

This one was also in primary forest, so I'm assuming it's A. hylaedactyla.