Acinonyx pardinensis, sometimes called the Giant cheetah, is an extinct felid species belonging to the genus Acinonyx, closely related to the cheetah, native to Eurasia during the Pliocene and Pleistocene epochs. It was substantially larger than the living cheetah.

Quick Facts Scientific classification, Binomial name ...

Acinonyx pardinensis Temporal range: Late Pliocene–Middle Pleistocene PreꞒ Ꞓ O S D C P T J K Pg N ↓
Skull, Firenze
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Suborder:	Feliformia
Family:	Felidae
Subfamily:	Felinae
Genus:	Acinonyx
Species:	†A. pardinensis
Binomial name
†Acinonyx pardinensis (Croizet & Jobert, 1828)
Synonyms[1]
Felis pardinensis Croizet & Jobert, 1828 Felis elata Bravard in Gervais, 1859 Cynailurus etruscus Del Camp, 1915 Cynailurus elatus sensu Schaub, 1939 Schaubia vireti Schaub, 1942

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Acinonyx pardinensis was roughly twice the size of today's cheetahs, weighing around 60–121 kg (132–267 lb),^[2][3] though A. pleistocaenicus was much larger.^[4] The morphology of the skull shows some similarities with those of pantherine cats and is not as short and deep as that of the modern cheetah.^[5][6][7] The teeth greatly resemble that of a modern cheetah.^[2] The limb bones, like those of a modern cheetah, were elongate relative to the animal's body size. The lumbar vertebrae were also elongate, suggesting the back was flexible. Compared to living cheetahs, the femur is more straight and the fibia is more robust and not fused to the tibia. The humerus is also more robust.^[8]

Acinonyx pardinensis is sometimes considered a macrospecies containing Acinonyx aicha, Acinonyx arvernensis, Acinonyx intermedius, Acinonyx pleistocaenicus, and Sivapanthera linxiaensis as subspecies.^[5]

Acinonyx pardinensis is known from remains spanning from western Europe to China, spanning from the Late Pliocene to the Middle Pleistocene. The true number of species of Acinonyx in the Plio-Pleistocene of Eurasia is unclear.^[2]

Like the modern cheetah, Acinonyx pardinensis is generally thought to have been adapted to running down prey. It probably took larger prey than living cheetahs, with estimated prey masses of 50–100 kilograms (110–220 lb),^[2] though the idea that its ecology was similar to a modern cheetah has been contested by some authors, who suggest an ecology more similar to pantherine cats.^[5] Due to its larger body size, it probably did not reach the same speeds as modern cheetah.^[8] The morphology of its carnassial teeth suggest like modern cheetahs that it did not consume bone,^[8] and probably left large parts of carcasses to other carnivores.^[2] While a 2011 study suggested that it killed its prey by suffocation like a modern cheetah,^[2] a 2014 study alternatively suggested that Acinonyx pardinensis likely killed prey via a bite to the neck similar to pantherine cats.^[5]

• Miracinonyx