The family is of quite recent origin: the first fossils are from the Oligocene, 25 million years ago (mya). There are 41 living species, including the domestic cat, and they are monophyletic: all descended from the same ancestor.[3]
Characteristics
Felids tend to have lithe and flexible bodies with muscular limbs. In most species, the tail is a third or a half the length of the body, with some exceptions (the bobcat and margay). The limbs are digitigrade, meaning they walk on their toes. The paws have three soft toe pads and retractible claws (usually).[1] The tongue of felids is covered with horny papillae, which rasp meat from prey and aid in grooming.
The felids evolved in Asia and spread across continents by crossing land bridges. DNAsequence analysis shows that ancient cats evolved into eight main lines. There were at least 10 migrations (in both directions) from continent to continent via the Bering land bridge and Isthmus of Panama. The Panthera genus is the oldest and the Felis genus is the youngest. 60 percent of the modern species of cats developed within the last million years.[4]
Genetic research has provided a basis for a more concise classification for the living members of the cat family based on genotypical groupings.[1][8][9] Specifically, eight genetic lineages have been identified:[10]
The last four lineages (5, 6, 7, 8) are more related to each other than to any of the first four (1, 2, 3, 4), and so form a clade within the Felinae subfamily of family Felidae.
↑Eizirik E. et al 2010. Pattern and timing of the diversification of the mammalian order Carnivora inferred from multiple nuclear gene sequences. Molecular Phylogenetics and Evolution56: 49-63. doi:10.1016/j.ympev.2010.01.033
↑Gaubert P. & Veron G. 2003. Exhaustive sample set among Viverridae reveals the sister-group of felids: the linsangs as a case of extreme morphological convergence within Feliformia. Proceedings of the Royal Society, Series B270 (1532): 2523–30. doi:10.1098/rspb.2003.2521
↑Johnson, W. E.; & O'Brien S. J. (1997). Phylogenetic reconstruction of the Felidae using 16S rRNA and NADH-5 mitochondrial genes. J Mol Evol (1997) 44: S98-116. Retrieved on 2009-11-08 from https://www.ncbi.nlm.nih.gov/pubmed/9071018?dopt=Abstract.