Nimravides Temporal range: | |
---|---|
Nimravides catocopis skull | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Carnivora |
Suborder: | Feliformia |
Family: | Felidae |
Subfamily: | † Machairodontinae |
Tribe: | † Homotherini |
Genus: | † Nimravides Kitts 1958 |
Type species | |
Nimravides thinobates (Macdonald, 1948) | |
Other Species | |
| |
Synonyms | |
N. catocopis
N. thinobates
N. pedionomus
N. hibbardi
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Nimravides is a genus of extinct saber-toothed cats that lived in North America during the Late Miocene, between 10.3 and 5.332 Ma. [1] Despite its scientific name, Nimravides does not belong to the Nimravidae, but is a true cat belonging to the family Felidae. [2]
The species Machaerodus catocopis was described by Cope in 1887, based on a partial mandible from the Loup Fork Beds. [3]
The species Pseudaelurus thinobates and Pseudaelurus pedionomus were both described by James Reid MacDonald in 1948. [4] [5]
The genus Nimravides was originally described by Kitt in 1958 for the species "Pseudaelurus" thinobates. [6]
In 1969, Dalquest described the species Pseudaelurus hibbardi. [7]
In 1975, Martin and Schultz reassigned Machairodus catacopsis to Nimravides and suggested that N. thinobates was a junior synonym of the former species. [8]
The species Nimravides galiani was first described in 1981 based on fragmentary material from the Love Bone Beds in Florida. The same paper also described additional fossils of N. thinobates compared to the holotype of N. catacopsis, and concluded that N. catacopsis was best considered a nomen vanum and the material assigned to it should be considered N. thinobates. [9]
"Pseudaelurus" pedionomus was reassigned to Nimravides in 1990 by Beaumont. [10]
In 2003, Tom Rothwell reassigned Pseudaelurus hibbardi to Nimravides. [11] And in 2010 it was suggested that N. hibbardi was a junior synonym of Adelphailurus kansensis. [12]
In 2013, Mauricio Anton et al. suggested that N. catacopsis should be re-reassigned back to Machairodus. [13] But this was refuted in 2022 by Jiangzuo et al.. [14]
Nimravides catacopsis, one of the largest and latest species, was quite large, measuring 100 cm (1.0 m) at the shoulder and was similar in size to a large tiger. It was also possessed of long, powerful legs and a long back. For many decades, it was also believed to be a member of the genus Machairodus , but, despite the similarities between them at first glance, based on autapomorphies in the skeleton, the two animals are too different to be classified as species of the same genus, and thus, Nimravides remains separate as its own genus within the Homotherini. [15]
Evidence published in November, 2022 suggests Nimravides was endemic to North America and that when the Machairodus- Amphimachairodus lineage emigrated to North America from Eurasia, differing aspects of their cranial anatomy allowed the newly arrived machairodont genera to survive a faunal change occurring during the earl-late Hemphillian stage of the Miocene Epoch some 6.5 million years ago. The analysis also determined that the Machairodus-Amphimachairodus lineage did not have a competitive edge over Nimravides, implying that neither newcomer or endemic species were superior to one another in regards to hunting adaptations. [14]
Pseudaelurus is a prehistoric cat that lived in Europe, Asia and North America in the Miocene between approximately twenty and eight million years ago. It is considered to be a paraphyletic grade ancestral to living felines and pantherines as well as the extinct machairodonts (saber-tooths), and is a successor to Proailurus. It originated from Eurasia and was the first cat to reach North America, when it entered the continent at about 18.5 Ma ending a 'cat-gap' of 7 million years. The slender proportions of the animal, together with its short, viverrid-like legs, suggest that it may have been an agile climber of trees.
Machairodus is a genus of large machairodont or ''saber-toothed cat'' that lived in Africa, Eurasia and North America during the late Miocene. It is the animal from which the subfamily Machairodontinae gets its name and has since become a wastebasket taxon over the years as many genera of sabertooth cat have been and are still occasionally lumped into it.
Dinofelis is an extinct genus of machairodontine, 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. Fossils very similar to Dinofelis from Lothagam range back to around 8 million years ago, in the Late Miocene.
Homotherium is an extinct genus of machairodontine scimitar-toothed cat that inhabited North America, South America, Eurasia, and Africa during the Pliocene and Pleistocene epochs from around 4 million to 12,000 years ago. In comparison to Smilodon, the canines of Homotherium were shorter, and it was probably adapted to running down rather than ambushing prey.
Nimravidae is an extinct family of carnivorans, sometimes known as false saber-toothed cats, whose fossils are found in North America and Eurasia. Not considered to belong to the true cats, the nimravids are generally considered closely related and classified as a distinct family in the suborder Feliformia. Fossils have been dated from the Middle Eocene through the Late Miocene epochs, spanning about 33.2 million years.
Smilodontini is an extinct tribe within the Machairodontinae or "saber-toothed cat" subfamily of the Felidae. The tribe is also known as the "dirk-toothed cats". They were endemic to South America, North America, Europe, Asia, and Africa during the Miocene to Pleistocene, from 10.3 mya—11,000 years ago, existing for approximately 10.3 million years.
Paramachaerodus is an extinct genus of saber-tooth cat of the subfamily Machairodontinae, which was endemic to Europe and Asia during the late Miocene from 15 to 9 Ma.
Megantereon was a genus of prehistoric machairodontine saber-toothed cat that lived in North America, Eurasia, and Africa. It is closely related to and possibly the ancestor of Smilodon.
Adelphailurus is an extinct genus of metailurin machairodontine (saber-toothed) cat that inhabited western North America during the middle Pliocene. It is monotypic, containing only the species Adelphailurus kansensis.
Barbourofelis is an extinct genus of large, predatory, feliform carnivoran mammals of the family Barbourofelidae. The genus was endemic to North America and Eurasia during the Miocene until its extinction during the Tortonian, living from 13.6 to 7.3 Ma.
Barbourofelidae is an extinct family of carnivorans of the suborder Feliformia, sometimes known as false saber-toothed cats, that lived in North America, Eurasia and Africa during the Miocene epoch and existed for about 7.9 million years. Thought to be an independent lineage from the Nimravidae and Machairodontinae, which had all attained elongated canines, recent research argues that it may be a subfamily of the Nimravidae, extending its biochronological range into the Miocene, although this issue is not yet fully resolved.
Miomachairodus is an extinct genus of large machairodontine containing only a single species, Miomachairodus pseudailuroides. It is known from Miocene-age fossils in China and Turkey and persisted until the Late Miocene. Fossils of this machairodont have been found in the Vallesian-age Bahe Formation in Shaanxi, China, and Yeni Eskihisar in Anatolia. This Turkish site is of Miocene age and is well known for its pollen studies.
Machairodontini is an extinct tribe of large saber-toothed cats of the subfamily Machairodontinae, that lived in Europe, Asia, Africa, and North America, during the Middle and Late Miocene.
Amphimachairodus is an extinct genus of large machairodonts. It is also a member of the tribe Homotherini within Machairodontinae and is most closely related to such species as Xenosmilus, Homotherium itself, and Nimravides. It inhabited Eurasia, Northern Africa and North America during the late Miocene epoch.
Yoshi is an extinct genus of machairodontine sabertooth cat in the tribe Metailurini. Its fossils were described from Turolian deposits from the Miocene epoch of the Balkan Peninsula in 2014 and specimens from China once thought to belong to Metailurus. The name comes from that of the lead author's pet cat. It has been described as potentially being synonymous with Metailurus, though this is difficult to confirm at present. The type specimen is a skull that bears remarkable similarities with the modern cheetah. Yoshi is intermediate in size between a lynx and cougar, and based on several as-yet unpublished skeletons, may have had a similar lifestyle to the cheetah, being better built for speed and fast pursuit than most other machairodonts, which were more suited to ambush and hunting large, relatively slow moving animals.
Styriofelis is an extinct genus of Felidae known from the Miocene of Europe.
Hyperailurictis is an extinct genus of felid from Miocene North America. The Hyperailurictis species are Pseudaelurus-grade felids and thought to be the first felids in the Americas.
Leptofelis is an extinct genus of Pseudaelurus-grade felid found in Spain.
Tchadailurus is a genus of machairodontine felid from the late Miocene of Chad, Africa.
Taowu is an extinct genus of machairodonts, a type of saber-toothed cat. It lived during the Early Pleistocene about 2.5 million years ago in East Asia. So far, only one skull is known, found in northern China. Based on this, a relatively small representative of the saber-toothed cats can be reconstructed, which only reached the size of a present-day leopard. In its dentition characteristics, it mediates between phylogenetic older forms such as Amphimachairodus and younger members such as Homotherium. The genus was scientifically described in 2022, but the find material was recovered as early as the 1930s.