Crocodylidae

The Crocodylidae family of crocodylians includes the true crocodiles which are the members of the subfamily Crocodylinae and the Tomistoma genus. Currently, the family includes two subfamilies, Crocodylinae and Tomistominae, with the latter being a subject of controversy whether it is a crocodile or belongs to the family Gavialidae. Further genetic analysis has to be done to come to a final conclusion.

Taxonomy

A total of three extant genera are placed in the family Crocodylidae, including a total of 15 species, including the desert crocodile, which is now accepted as a true species rather than a subspecies of the Nile crocodile. Recent studies suggest the dwarf crocodile, Osteolaemus tetraspis, is not a single, but two or even three species. If so, the species count of extant crocodiles would be 16 or 17, putting the extant crocodylian species to a total of 26 instead of 24.

True crocodiles

The two extant genera of true crocodiles, Crocodylus and Osteolaemus, are in the subfamily Crocodylinae. Even according to traditional classification, the Tomistoma is not a true crocodile, though it is a member of the family Crocodylidae. Latest molecular evidence points to an even greater difference, creating the possibility that in fact Tomistoma is genetically closer to the gharial than true crocodiles. If proven, the species will be classified under the family Gavialidae.