Plica cf. plica — undescribed species
I had identified the lizards on this page as Plica plica, but a 2013 paper came along and restricted that species to the Guiana Shield. This same paper says "The survey of the specimens examined here suggests Peru has at least three distinct species", but leaves them all undescribed. So for now at least any of these lizards from Peru that were formerly included in Plica plica now don't have an official name. Poor things.
Madre Selva Biological Station, Loreto, Peru—January 16, 2013
undescribed species (Plica cf. plica)
These are very interesting lizards, specialized for a life of running quickly up and down tree trunks. They're basically in this position pretty much all the time, even at night when they're sleeping (as here).

Here is a complete list of the herps I saw in the wild on my 2013 MT Amazon Expeditions trip.

Madre Selva Biological Station, Loreto, Peru—January 18, 2013
undescribed species (Plica cf. plica)
And here's one during the day, simultaneously watching for tasty bugs and also watching for scary photographers.
Santa Cruz Forest Reserve, Loreto, Peru—January 21, 2014
undescribed species (Plica cf. plica)
This colorful young Plica was perched on a tree behind the Santa Cruz facility's kitchen. It was willing to hold its pose for me as I slowly crept closer and closer. A few minutes later someone approached a little too quickly and it darted up the tree.

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

Online references:
Printed references: