Amphimachairodus

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Amphimachairodus
Temporal range: Late Miocene 9.5–5.3  Ma
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Machairodus giganteus 1.jpg
A. giganteus skull
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Suborder: Feliformia
Family: Felidae
Subfamily:† Machairodontinae
Tribe:† Homotherini
Genus:† Amphimachairodus
Kretzoi, 1929
Type species
†Amphimachairodus palanderi
(Zdansky 1924) sensu Kretzoi, 1929
Other Species [1]
  • A. alvareziRuiz-Ramoni et al., 2019
  • A. coloradensis(Cook, 1922)
  • A. giganteus(Wagner, 1848)
  • A. hezhengensisJiangzuo et al., 2023
  • A. horribilis(Schlosser, 1903)
  • A. kabir(Peigne et al., 2005)
  • A. kurteni?(Sotnikova, 1992)
Synonyms
Synonyms of A. coloradensis
  • Machairodus coloradensis Cook, 1922
Synonyms of A. giganteus
  • Machairodus giganteus
Synonyms of A. horribilis
  • Machairodus horribilisSchlosser, 1903
  • Machairodus tingiiZdansky, 1934
  • Amphimachairodus tingii(Zdansky, 1934)
  • Machairodus irtychensisOrlov, 1936
  • Amphimachairodus irtychensis(Orlov, 1936)
Synonyms of A. palanderi
  • Machairodus palanderi
  • Machairodus kurteni? Sotnikova, 1992
  • Amphimachairodus kurteni?
Synonyms of A. kabir
  • Machairodus kabirPeigne et al., 2005
  • Adeilosmilus kabir

Amphimachairodus is an extinct genus of large machairodonts. [2] 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. [3] [4]

Contents

History and taxonomy

The genus Amphimachairodus was first proposed by Miklos Kretzoi for the species Machairodus palanderi. [5]

Machairodus horribilis was first described in 1903 by Schlosser, who failed to correctly designate a holotype specimen, and thus the species was largely ignored until a 2008 paper redescribed the species and properly designated a lectotype for it. [6] It was subsequently suggested to be reassigned to Amphimachairodus by Ruiz-Ramoni et al. (2019). [7]

Amphimachairodus pliocaenicus was described in 1988 by Joan Pons-Moyà based on fossils from the early Pliocene, found on the Iberian Peninsula. [8] But Ruiz-Ramoni et al. in 2019 considered the fossils too scarce to confirm its assignment to the genus. [7]

Machairodus kurteni was described in 1992. The same paper also resurrected the previously-synonymized Pogonodon copei as Machairodus copei, and reassigned the subspecies Machairodus aphanistus taracliensis as Machairodus giganteus taracliensis. [9]

Machairodus kabir was described in 2005, [10] and reassigned to Amphimachairodus in 2007. [11] The describing paper also considered the species Machairodus tingii, Machairodus leoninus, Machairodus taracliensis, and Machairodus palanderi synonyms or subspecies of "Machairodus" giganteus. [10]

Amphimachairodus alvarezi was described by Ruiz-Ramoni et al. in 2019. [7]

In 2023, a review of the genus considered species Amphimachairodus irtychensis a junior synonym of A. horribilis, and A. kurteni a synonym of A. palanderi. [12]

The species Amphimachairodus hezhengensis was described in 2023. [13]

Amphimachairodus has been suggested to be a paraphyletic evolutionary grade that evolved from species of the genus Machairodus , and is in turn ancestral to later homotherines like Homotherium . [14]

Description

Front limb Amphimachairodus giganteus forefoot.JPG
Front limb

There was marked sexual dimorphism in A. giganteus, with males being much larger than females. [15]

The species Amphimachairodus coloradensis, from the United States (formerly Machairodus coloradensis) was a significantly large animal, about 1.2 m (3.9 ft) at the shoulder, according to skeletal and life reconstructions, potentially making it one of the largest known felids. [16] All Amphimachairodus species have a developed mandibular flange, however, A. colaradensis is distinguishable from A. giganteus and A. kurteni by subtle differences in the shape of the mandible and placement of lower carnassials.

In size and proportions, the Eurasian species A. giganteus was remarkably similar to a modern lion or tiger and had a shoulder height of 1.1 m (3.6 ft). This species has a skull length of around 14 in (36 cm). [17] The African species A. kabir (formerly Machairodus kabir, from Arabic kabir = "big") is suggested to have weighed over 350 kg (770 lb). This would make it comparable in size to Xenosmilus , Machairodus horribillis and slightly smaller than Smilodon populator . In 2022, this species was proposed to be reassigned to a separate genus, called Adeilosmilus. [18]

Amphimachairodus was about 2 metres (6.6 feet) long and probably hunted as an ambush predator. Its legs were too short to sustain a long chase, but it most likely was a good jumper. It probably used its canines to cut open the throat of its prey, severing the major arteries and possibly crushing the windpipe. Its teeth were rooted to its mouth and were not as delicate as those of most other saber-toothed cats of the time, which had extremely long canines that hung out of their mouths. The fangs of Amphimachairodus, however, were able to easily fit in its mouth comfortably while being long enough to be effective for hunting. [19]

Skull

This specimen was from a large male A. giganteus with the skull measuring 14 in (36 cm) from the Late Miocene in China, comparable to a male lion or tiger. [20] Deformation of the skull through natural fossilization processes has changed the shape slightly, making it asymmetrical, but overall it remains an excellent specimen for studying the cranial morphology of this particular genus and species.

For felines, this skull is rather long, but rivaled by the skulls of the two largest species of extant cats: the lion and tiger. [21] When compared with the skull of a regular lion, it is long and very narrow, particularly in the muzzle and width of the zygomatic arches. Its sagittal crest is well pronounced. Compared with other machairodonts, the canines are stout and capable of large amounts of stress. This characteristic is slightly remodeled in females, whose canines are slimmer and generally longer. [22] Compared with females, the orbit of males are smaller, muzzles larger, the anterior-most portion of the nasal bones generally flare upwards slightly, and the downward slope of the dorsal edge of the skull in front of the orbit is not as pronounced, producing a straighter profile. Compared with the most well known machairodont Smilodon , commonly referred to as the "saber-toothed cat", the canines are much shorter, the facial portion again is much longer, and the teeth not reduced so far in number. Several machairodonts, namely Megantereon , bear flanges on the mandible, which are very reduced in A. giganteus though characteristics of the mandible associated with the flanges are present, particularly the lateral flattening of the anterior portion of the mandible, creating a cross section more square than semi-circular. The dental formula for this specimen is 3.1.2.13.1.2.1.

Paleoecology

An A. giganteus skull with chipped left canine and more severely damaged right canine. This chipping is not severe enough to be called a true break, which would be in excess of half of the canine Machairodus palanderi.jpg
An A. giganteus skull with chipped left canine and more severely damaged right canine. This chipping is not severe enough to be called a true break, which would be in excess of half of the canine

Amphimachairodus giganteus was an inhabitant of woodlands and open floodplains as based on finds in Pikermi in Greece and Shanxi Province in China, indicating it had habitat preferences similar to modern lions in many respects. Specimens recovered from Turolian deposits indicate that the fauna living there was much the same, differing only by species in many cases.

Life restoration of A. hezhengensis Amphimachairodus hezhengensis life restoration - Jiangzuo et al 2023.jpg
Life restoration of A. hezhengensis

Among the creatures it shared its environment with were bovids such as Parabos , Lutung monkeys, the proboscidean Anancus , the rhino Aceratherium , antelopes such as Tragoportax and Miotragocerus as well as gazelles and deer, a very large species of hyrax, early goats, various giraffes, camels such as Paracamelus , the horse Hipparion , a species of aardvark, the chalicothere Ancylotherium and the beaver-like Dipoides . Other carnivores it shared its territory with include the percrocutid Dinocrocuta , the bear Agriotherium , fellow machairodonts Metailurus and Paramachairodus and hyenas like Thalassictis . [23]

The larger herbivores were likely common prey for Amphimachairodus, and it likely would have competed with Agriotherium for food, possibly yielding kills to the bear and possibly also stealing kills from hyenas such as Thalassictis and from Metailurus when the opportunity arose. [24]

In North America, in places such as Coffee Ranch in Texas, Amphimachairodus coloradensis shared territory with Agriotherium as it had in Africa and Eurasia, but also shared territory with the feliform Barbourofelis and the canids such as Vulpes , Epicyon and Borophagus , and herbivores like the camels Aepycamelus and Hemiauchenia the pronghorn antelope Cosoryx , horses like Dinohippus, Neohipparion and Nannippus , the peccary Prosthennops and rhinoceroses like Teleoceras and Aphelops . [25] [26] At the Optima fossil site in Oklahoma isotopic analysis suggest a high degree of niche partitioning within the carnivore guild (Agriotherium, Borophagus, Eucyon , & the mustelid Pliotaxidea) with A. coloradensis having a preference for horses (61.4%) as opposed to camels, mastodons, pronghorns & rhinos (38.7%). A. coloradensis also had the lowest degree of moderate & heavy tooth wear, suggesting it primarily fed on soft tissues. [27] [28]

In the Djurab desert in northern Chad, Amphimachairodus kabir co-existed with fellow machairodonts Lokotunjailurus , Tchadailurus and early representatives of the genus Megantereon . In addition, animals such as crocodiles, three-toed horses, fish, monkeys, hippos, aardvarks, turtles, rodents, giraffes, snakes, antelopes, pigs, mongooses, foxes, hyenas, otters, honey badgers and the hominid Sahelanthropus dwelled here, providing ample food. Based on these and other fossils, it is theorized that the Djurab was once the shore of a lake, generally forested close to the shore with savannah-like areas some distance away. [29] The great number of cat species in the environment indicates that there was significant prey and available niches for multiple species of large felids to coexist. [30] [31]

In the middle Miocene of the Tibetan Plateau, Amphimachairodus hezhengensis would have coexisted with a number of other large carnivores including two species of medium-sized bears, the barbourofelid Albanosmilus , and the huge hyena Dinocrocuta . Potential prey species in the locality would have included rhinoceroses, pigs, deer, and medium-sized bovids. Other animals known from the area include skunks, mustelids, and four species of small to medium-sized hyena. [32]

Related Research Articles

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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.

<i>Dinofelis</i> Extinct genus of carnivores

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.

<i>Smilodon</i> Extinct genus of saber-toothed cat

Smilodon is an extinct genus of felids. It is one of the best known saber-toothed predators and prehistoric mammals. Although commonly known as the saber-toothed tiger, it was not closely related to the tiger or other modern cats, belonging to the extinct subfamily Machairodontinae, with an estimated date of divergence from the ancestor of living cats around 20 million years ago. Smilodon was one of the last surviving machairodonts alongside the distantly related Homotherium. Smilodon lived in the Americas during the Pleistocene epoch. The genus was named in 1842 based on fossils from Brazil; the generic name means "scalpel" or "two-edged knife" combined with "tooth". Three species are recognized today: S. gracilis, S. fatalis, and S. populator. The two latter species were probably descended from S. gracilis, which itself probably evolved from Megantereon. The hundreds of specimens obtained from the La Brea Tar Pits in Los Angeles constitute the largest collection of Smilodon fossils.

<i>Homotherium</i> Extinct genus of carnivores

Homotherium is an extinct genus of scimitar-toothed cat belonging to the extinct subfamily Machairodontinae that inhabited North America, Eurasia, and Africa during the Pliocene and Pleistocene epochs from around 4 million to 12,000 years ago. It was one of the last surviving members of the subfamily alongside the more famous sabertooth Smilodon, to which it was distantly related. It was a large cat, comparable in size to a lion, functioning as an apex predator in the ecosystems it inhabited. In comparison to Smilodon, the canines of Homotherium were shorter, and it is suggested to have a different ecology from Smilodon as pursuit predator adapted to running down prey in open habitats, with species of the genus also proposed to have engaged in cooperative hunting.

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<span class="mw-page-title-main">Machairodontinae</span> Extinct subfamily of carnivores

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<i>Adelphailurus</i> Extinct genus of felid

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<i>Nimravides</i> Extinct genus of carnivores

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<i>Lokotunjailurus</i> Extinct genus of carnivores

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<span class="mw-page-title-main">Homotherini</span> Extinct tribe of carnivores

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Lars Werdelin is a Swedish paleontologist specializing in the evolution of mammalian carnivores. His areas of scientific interest include the evolutionary interaction of carnivores and hominins in Africa, as well as the evolution and phylogeny of carnivore clades such as the Machairodontinae, the lynxes and the Hyaenidae.

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Tchadailurus is a genus of machairodontine felid from the late Miocene of Chad, Africa.

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References

  1. ↑ Sardella, Raffaele; Werdelin, Lars (2007). "Amphimachairodus (Felidae, Mammalia) from Sahabi (Latest Miocene-earliest Pliocene, Libya), with a review of African Miocene Machairodontinae". Revista Italiana di Paleontologia e Stratigrafia. 113 (1).
  2. ↑ Christiansen, P. (2012). "Phylogeny of the sabertoothed felids (Carnivora: Felidae: Machairodontinae)". Cladistics. 29 (5): 543–559. doi: 10.1111/cla.12008 . PMID   34814379. S2CID   85111366.
  3. ↑ Werdelin, L.; O'Brien, S.J.; Johnson, W.E.; Yamaguchi, N. (2010). "Phylogeny and evolution of cats (Felidae)". In Macdonald, D.W.; Loveridge, A.J. (eds.). Biology and Conservation of Wild Felids. Oxford: Oxford University Press.
  4. ↑ Anton, Mauricio (2013). Sabertooth.
  5. ↑ Kretzoi, M. (1929). "Materialen zur phylogenetischen Klassifikation der Aeluroideen". Cong. Int. Zool. Budapest. 10: 1293–1355.
  6. ↑ Qiu, Zhan-Xiang; Liu, Jin-Yi (2008). "Description of Skull Material of Machairodus horribilis Schlosser, 1903". Vertebrata PalAsiatica. 46 (4): 265–283.
  7. 1 2 3 Ruiz-Ramoni, Damián; Rincón, Ascanio D.; Montellano-Ballesteros, Marisol (2020). "Taxonomic revision of a Machairodontinae (Felidae) from the Late Hemphillian of México". Historical Biology. 32 (10): 1312–1319. doi:10.1080/08912963.2019.1583750. S2CID   91277834.
  8. ↑ Pons-Moyà, J. (1988). "Amphimachairodus pliocaenicus nov. sp. (Felidae, Carnivora). Nuevo Machairodontini del Plioceno inferior de la Península Ibérica" [Amphimachairodus pliocaenicus nov. sp. (Felidae, Carnivora). New Machairodontini from the Lower Pliocene of the Iberian Peninsula]. Paleontologia i Evolució (in Spanish). 22: 51–54.
  9. ↑ Sotnikova, M. V. (1991). "A new species of Machairodus from the late Miocene Kalmakpai locality in eastern Kazakhstan (USSR)". Annales Zoologici Fennici. 28 (3/4): 361–369. JSTOR   23735460.
  10. 1 2 Peigné, Stéphane; De Bonis, Louis; Likius, Andossa; MacKaye, Hassane Taïsso; Vignaud, Patrick; Brunet, Michel (2005). "A new machairodontine (Carnivora, Felidae) from the Late Miocene hominid locality of TM 266, Toros-Menalla, Chad". Comptes Rendus Palevol. 4 (3): 243–253. Bibcode:2005CRPal...4..243P. doi:10.1016/j.crpv.2004.10.002.
  11. ↑ "Amphimachairodus (Felidae, Mammalia) from Sahabi (latest Miocene-earliest Pliocene, Libya), with a review of African Miocene Machairodontinae".{{cite journal}}: Cite journal requires |journal= (help)
  12. ↑ Wang, Xiaoming; Carranza-Castañeda, Oscar; Tseng, Z. Jack (2023). "Fast spread followed by anagenetic evolution in Eurasian and North American Amphimachairodus". Historical Biology. 35 (5): 780–798. doi:10.1080/08912963.2022.2067756. S2CID   248597661.
  13. ↑ Jiangzuo, Qigao; Werdelin, Lars; Sanisidro, Oscar; Yang, Rong; Fu, Jiao; Li, Shijie; Wang, Shiqi; Deng, Tao (2023). "Origin of adaptations to open environments and social behaviour in sabretoothed cats from the northeastern border of the Tibetan Plateau". Proceedings of the Royal Society B: Biological Sciences. 290 (1997). doi:10.1098/rspb.2023.0019. PMC   10113030 . PMID   37072045.
  14. ↑ Jiangzuo, Qigao; Werdelin, Lars; Sun, Yuanlin (May 2022). "A dwarf sabertooth cat (Felidae: Machairodontinae) from Shanxi, China, and the phylogeny of the sabertooth tribe Machairodontini". Quaternary Science Reviews. 284. Article 107517. Bibcode:2022QSRv..28407517J. doi:10.1016/j.quascirev.2022.107517.
  15. ↑ Turner, A.; Antón, M. (1997). The Big Cats and Their Fossil Relatives: An Illustrated Guide to Their Evolution and Natural History. Columbia University Press. ISBN   978-0-2311-0229-2. OCLC   34283113.
  16. ↑ Turner, Alan; Anton, Mauricio (1997). The Big Cats and Their Fossil Relatives.
  17. ↑ Augusti, Jordi (2002). Mammoths, Sabertooths, and Hominids: 65 Million Years of Mammalian Evolution in Europe. Columbia University Press. p. 195. ISBN   978-0-2311-1641-1.
  18. ↑ Jiangzuo, Q.; Werdelin, L.; Sun, Y. (2022). "A dwarf sabertooth cat (Felidae: Machairodontinae) from Shanxi, China, and the phylogeny of the sabertooth tribe Machairodontini". Quaternary Science Reviews. 284: Article 107517. Bibcode:2022QSRv..28407517J. doi:10.1016/j.quascirev.2022.107517.
  19. ↑ Legendre, S.; Roth, C. (1988). "Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia)". Historical Biology. 1 (1): 85–98. doi:10.1080/08912968809386468.
  20. ↑ "Male Machairodus giganteus skull". Black Hill Institute. Archived from the original on 2010-12-23. Retrieved 2013-04-11.
  21. ↑ Heptner, V. G.; Sludskii, A. A. (1992) [1972]. Mlekopitajuščie Sovetskogo Soiuza. Moskva: Vysšaia Škola [Mammals of the Soviet Union, Volume II, Part 2]. Washington DC: Smithsonian Institution and the National Science Foundation. pp. 83–202. ISBN   978-90-04-08876-4.
  22. ↑ "Female Machairodus giganteus skull". Archived from the original on 2015-09-20. Retrieved 2013-04-11.
  23. ↑ Augusti, Jordi (2002). Mammoths, Sabertooths, and Hominids: 65 Million Years of Mammalian Evolution in Europe. Columbia University Press. pp. 182–190. ISBN   978-0231116411.
  24. ↑ Antón, Mauricio (2013). Sabertooth. Bloomington, Indiana: University of Indiana Press. pp. 53–54. ISBN   9780253010421.
  25. ↑ Antón, Mauricio (2013). Sabertooth. Bloomington, Indiana: University of Indiana Press. p. 39. ISBN   9780253010421.
  26. ↑ Turner, Alan (1997). The Big Cats and their fossil relatives. New York: Columbia University Press. p. 201. ISBN   978-0-231-10228-5.
  27. ↑ Frederickson, Joseph; Joshua, Cohen; Michael, Engel; Tyler, Hunt; Greg, Wilbert; Olga, Castañeda; Nicholas, Czaplewski (Mar 2022). "The paleoecology of the Late Miocene mammals from the Optima Local Fauna of Oklahoma, USA" (PDF). Acta Palaeontologica Polonica. 67 (1): 221–238. doi:10.4202/app.00941.2021. S2CID   247898700 . Retrieved 29 July 2023.
  28. ↑ "The paleoecology of the Late Miocene mammals from the Optima Local Fauna of Oklahoma, USA". App.pan. 2022.
  29. ↑ January 2011, Charles Q. Choi 17 (2011-01-17). "Sabertooth Cats May Have Feasted on Early Humans". livescience.com. Retrieved 2021-09-01.{{cite web}}: CS1 maint: numeric names: authors list (link)
  30. ↑ "New sabre toothed Felidae (Carnivora, Mammalia) in the hominid-bearing sites of Toros Menalla (late Miocene, Chad)" (PDF). Science Press. 2018-02-15.
  31. ↑ "Paleo Profile: The Chad Cat". Scientific American.
  32. ↑ Jiangzuo, Q; Werdelin, L; Sanisidro, O; Yang, Rong; Fu, Jiao; Li, Shijie; Wang, Shiqi; Deng, Tao (April 2023). "Origin of adaptations to openenvironments and social behaviour insabretoothed cats from the northeasternborder of the Tibetan Plateau". Royal Society Publishing. 290 (1997): 7–8. doi:10.1098/rspb.2023.0019. S2CID   20230019.
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