Deuterostomia

Crocodylus is one of three genera from the Crocodylinae subfamily extending from the Crocodylidae family.

Established species include four extinct species:

The 13 living species are:

The cladogram below follows the topology from a 2011 analysis of mitochondrial DNA sequences by Robert W. Meredith, Evon R. Hekkala, George Amato and John Gatesy.

The cladogram below follows the topology from a 2012 analysis of morphological traits by Christopher A. Brochu and Glenn W. Storrs. Many extinct species of Crocodylus might represent different genera. C. suchus was not included, because its morphological codings were identical to these of C. niloticus. However, the authors suggested that it could be explained by their specimen sampling, and considered the two species to be distinct.

Shawn Heflick (born June 17, 1969) is an explorer, adventurer, biologist and current TV host for Python Hunters on National Geographic Wild.

Heflick was born in Akron, Ohio. He grew up on a farm outside of Marion, Ohio living the life most farm boys did, which was running the woods and fields with his dogs. At age 7, he knew he wanted to be a biologist and to work with animals. He attended Pleasant High School, after moving into a more residential farming community. He graduated in 1987. Wanting to go to college to earn his biology degree, but not having the money for it, Heflick joined military service and volunteered to go to Central America. He was not disappointed with what he found and his love for exotic exploration and adventure was born. He enrolled in Wright State University to gain a degree in biology and met his future wife, Jennifer, the first week he was there. During these college years, he worked multiple jobs to make it through. Heflick worked at a vet clinic, a physiology lab and was security at a bar to name a few. He graduated in 1994 and married Jennifer before moving down to Melbourne, Florida to enter graduate school at the Florida Institute of Technology.