Two of the four basilisks in Costa Rica are easy to identify, the Green or Emerald Basilisk is rather obvious! As is the Helmeted Basilisk! 🙂 But the two I have never been able to easily identify are the Basiliscus basiliscus, Common Basilisk and the Basiliscus vittatus, Striped or Brown Basilisk which is further complicated by many calling both Common Basilisk, all in Spanish of course! 🙂 Then colors and patterns vary according to local and age of the lizard, from baby to juvenile to immature adult to adult and of course some slight differences in the sexes. So, for years my gallery has had just one basket for all of “Common, Brown and Striped Basilisks,” even though the scientific names are two.
I now found a simple way to separate the two species and now have two separate galleries for the two scientific names. Thanks to iNaturalist Costa Rica, I suddenly realized that the easiest to identify difference is where they live! 🙂 One on the Caribbean Slope and one on the Pacific Slope.
The one in this photo made on the Caribbean Coast is a Brown or Striped Basilisk, Basiliscus vittatus (my gallery link). Note that even though most locals say one or the other (Brown or Striped), most books and websites use both for the common name of this one species, Basiliscus vittatus. And similarly, the Spanish common names are two, Basilisco CafĂ© or Basilisco Rayado, and the people on the Caribbean Slope often use a shortened name of “Common Basilisk” (“Basilisco ComĂşn“), even though that is the official common name of the one on the other coast! See my confusion about what to call these little lizards? 🙂
The one that is officially called Common Basilisk is Basiliscus basiliscus (my gallery link) and is found only on the Pacific Slope! The Spanish name for it is Lagarto Jesucristo ComĂşn, and thus the only one to legitimately use the name “Common Basilisk” (“Basilisco ComĂşn“). And by the way, even though only in the official Spanish common name of this one, both of these, plus the Green Basilisk, are regularly called “Jesus Christ Lizards,” because all three walk on water! 🙂
And if you are confused, welcome to the club! 🙂
¡Pura Vida!
I do have this photo in an “Other Wildlife” sub gallery of my trip gallery, though the bee I shared earlier is the only other good photo, with a so so one of Leafcutter Ants. Since I first wrote this I have completed the entire Trip Gallery! 🙂