Alopoglossus atriventris Black-bellied Forest Lizard
Santa Cruz Forest Reserve, Loreto, PeruJanuary 19, 2013
Black-bellied Forest Lizard (Alopoglossus atriventris) Black-bellied Forest Lizard (Alopoglossus atriventris)
This small lizard was clinging to a medium-sized tree trunk that was lying across a small stream. It ran back and forth on the trunk, but was very reluctant to leave it. Thanks to Mike Pingleton for digging up the journal article that explains how to distinguish A. atriventris from A. angulatus and other related species.

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

Santa Cruz Forest Reserve, Loreto, PeruJanuary 19, 2014
Black-bellied Forest Lizard (Alopoglossus atriventris)
Apparently the only sure way to tell Alopoglossus atriventris from Alopoglossus buckleyi is to check if the belly scales are smooth or keeled. I think that I can see keels on the row or two of belly scales visible in this photo, when I look at the full-resolution version. Also, in the range maps in the 2012 Alopoglossus monograph by Köhler et al, A. atriventris is shown from the Iquitos area, whereas A. buckleyi is shown only considerably further west.

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

Quistacocha Zoo, Iquitos, Loreto, PeruJanuary 30, 2016
Black-bellied Forest Lizard (Alopoglossus atriventris)
As several fellow herp enthusiasts and I walked slowly along a grassy drainage ditch, scouring the vegetation for little frogs with bright red markings, a tiny movement caught my eye and I focused to see this minuscule lizard creeping into a bush's root system. I managed to get this one photo from about ten feet away before it was completely out of sight. I'm sure it was a tiny Gymnophthalmid, and from the local candidates I'm reasonably confident that it was Alopoglossus atriventris.

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.

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