Dinofelis is an extinct genus of machairodontine (sabre-toothed cat), usually classified in the tribe Metailurini. It was widespread in Europe, Asia, Africa and North America from 5 million to about 1.2 million years ago (early Pliocene to early Pleistocene). Fossils very similar to Dinofelis from Lothagam range back to around 8 million years ago, in the Late Miocene.[1] [2]
The genus Dinofelis was originally named by Otto Zdansky in 1924 for the species Dinofelis abeli.
Further fossil species were named, including Felis diastemata and Meganthereon barlowi, which were later transferred to the genus Therailurus, which was in turn later considered a junior synonym of Dinofelis.
A comprehensive review of the genus was published in 2001 by paleontologists Lars Werdelin and Margaret E. Lewis, including mention of the then-unnamed Langebaanweg and Lothagam species, as well as naming a new species Dinofelis aronoki; the species epithet came from the phrase arono ki which, in the language of the people of eastern Turkana, means "it was terrible". The review also noted six different sets of remains that were referable to Dinofelis but were too fragmentary to assign to any one species.
Another unnamed (again due to fragmentary material) species was described in 2021 based on fossils from a Plio-Pleistocene site in Northern Africa.[2]
In 2023 the Langebaanweg species was described as Dinofelis werdelini; the specific epithet honored Lars Werdelin. It assigned a holotype, paratype, and nine other specimens of fragmentary cranial material (some of which had previously been referred to other species) to the newly-named species.
This genus varied in size, with a similar range of sizes to Panthera. In one study, the body mass of Dinofelis was estimated at 149abbr=onNaNabbr=on, though species with similar dimensions to large lynx or small pumas also existed.[2]
The canine teeth of Dinofelis are longer and more flattened than those of modern cats but less than those of other saber-tooths. While the lower canines are robust, the cheek teeth are not as robust as those of most modern big cats.[3]
Dinofelis werdelini was a medium-sized machairodontine, about the size of a large jaguar, with robust upper canines and relatively small cheek teeth.
The phylogenetic status of Dinofelis within Machairodontinae has been difficult to ascertain historically, and various positions within Felidae have been proposed for the genus.[4] It has commonly been recovered as belonging to the tribe Metailurini,[2] although one recent analysis contested the monophyly of Metailurini, placing Dinofelis as a sister taxon to Rhizosmilodon.[5]
A number of species are currently accepted in the genus:
Additional fossils from Lothagam (specifically the Nawata Formation and the Apak Member of the Nachukui Formation) are considered to represent another, unnamed species; one smaller and more primitive than other known species.
A major review of Dinofelis by Werdelin et al. in 2001 produced a cladogram of its species:
The 2023 paper that named D. werdelini found it to be a sister to a clade formed by D. cristatus, D. petteri, D. piveteaui, and D. barlowi, but did not test it against the rest of the genus.[7]
Dinofelis position amongst the Metailurini per a 2018 phylogenetic analysis:[8]
Morphometric analysis of Dinofelis specimens from Olduvai Gorge suggests that the felid was best suited for mixed habitats rather than open grasslands or closed woodlands.[9]
Analysis of carbon isotope ratios in specimens from Swartkrans indicates that Dinofelis preferentially hunted grazing animals. The main predators of hominids in the environment at that time were most likely leopards and fellow machairodont Megantereon, whose carbon isotope ratios showed more indication of preying on hominids.[10] [11]
Several sites from South Africa seem to show Dinofelis may have hunted and killed Australopithecus africanus, since the finds mingle fossilized remains of Dinofelis, hominids, and other large contemporary animals. In South Africa, Dinofelis remains have been found near Paranthropus fossil skulls, a few with precisely spaced canine holes in their crania, so it is possible Dinofelis preyed on robust hominids as well. This may have been rare, however, as carbon isotope ratios contradict this.
It is thought that the gradual disappearance of its forest environment may have contributed to Dinofelis extinction at the start of the ice age.