Corytophanes cristatus
—
Helmeted Basilisk
Also known as:
Casque-headed Basilisk, Casque-headed Lizard, Old Man Lizard, Helmeted Iguana
Trail from Esquinas Rainforest Lodge, Golfito region, Puntarenas province, Costa Rica—September 24, 2001



I was very excited to discover one of these lizards by flashlight at night, perched about 6 feet off the ground on a thin vertical branch. Later that night someone else found another, and we brought both back for photos the next day. I had searched for these lizards on earlier trips to Belize and Costa Rica, and was very happy to finally find one.
These lizards rely on their camouflage to an almost ludicrous extent. They sit absolutely still, usually perched vertically as in the first picture above. They are among the most cooperative saurian photo models you could hope for, though I should admit that one of the two got tired of me taking its picture after about fifteen minutes and made a half-hearted dash for freedom, which was easily thwarted. We released both of these in some vegetation near the cabins at the lodge, and they remained in the same places for at least two days (then we left town).
Here is a complete list of the species we found on this GreenTracks trip.

A mere 22 and a half years later, I found another one of these adorably weirdo lizards. I was hoping for the other species of Corytophanes that also lives in Guatemala, but was happy to settle for the same species I saw before.
Here is a list of all the reptiles and frogs I saw on this trip to Guatemala.

And one more a couple of nights later. These are the Boyd's Forest Dragons of the New World, and that is quite a compliment.
Online references:
- Corytophanes cristatus account on The Reptile Database
- Corytophanes cristatus account on iNaturalist
Printed references:
- Beletsky, L. 1998. Costa Rica: The Ecotraveller's Wildlife Guide
- Campbell, J. A. 1998. Amphibians and Reptiles of Northern Guatemala, the Yucatán, and Belize
- Hayes, M. P., Pounds, J. A., Timmerman, W. W. 1989. An Annotated List and Guide to the Amphibians and Reptiles of Monteverde, Costa Rica
- Köhler, G. 2008. Reptiles of Central America, 2nd Edition
- Lee, J. C. 2000. A Field Guide to the Amphibians and Reptiles of the Maya World: The Lowlands of Mexico, Northern Guatemala, and Belize
- Lee, J. C. 1996. The Amphibians and Reptiles of the Yucatán Peninsula
- Leenders, T. 2001. A Guide to Amphibians and Reptiles of Costa Rica
- Savage, J. M. 2002. The Amphibians and Reptiles of Costa Rica
- Savage, J. M., Villa R., J. 1986. Introduction to the Herpetofauna of Costa Rica