I would think this would be the most appropriate place to post questions about any ameivas or whiptails.
Ameivas are the common name of the lizards placed in the genus Ameiva (how fitting). Please do not confuse them with the lizards sold as dwarf tegus (Callopistes sp.), as they are most deffinitely not the same thing. The lizard in the picture certainly appears to be an Ameiva species, although a lot of the Kentropyx and Cnemidophorus species look very similar.
Luckily, they are pretty easy to keep. Keep them just like you would keep a tegu-a good layer of substrate for them to burrow in, bark and logs for them to hide under, a high basking spot (100 farenheit) and a big cage. They will eat anything they can get in their mouths-any small insects, small rodents, small lizards etc. Males are usually much more colorful. Most stay under 2ft total length with approximately 2/3 of that tail.
Typically they are pretty easy to keep once they have decent weight, but a lot of the fresh imports you see are severly dehydrated and malnourished, and if they are not eating or not eating well they can lose weight very quickly.
Thats my input.
Paul