Homotherium

Homotherium Temporal range: Early Pliocene to Late Pleistocene, 4–0.012  Ma [1] PreꞒ Ꞓ O S D C P T J K Pg N ↓
Skeleton of H. serum from Friesenhahn cave, Texas Science & Natural History Museum, University of Texas at Austin, Austin, Texas.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Suborder:	Feliformia
Family:	Felidae
Subfamily:	† Machairodontinae
Tribe:	† Homotherini
Genus:	† Homotherium Fabrini, 1890
Type species
Homotherium latidens Owen, 1846
Other species
Homotherium ischyrus(Merriam, 1905) Homotherium serum(Cope, 1893) Homotherium venezuelensis?Rincón et al., 2011 For others, see text
Synonyms
Dinobastis Cope, 1893

Homotherium is an extinct genus of scimitar-toothed cat belonging to the extinct subfamily Machairodontinae that inhabited North America, Eurasia, and Africa (as well as possibly South America) during the Pliocene and Pleistocene epochs from around 4 million to 12,000 years ago. ^{[1] [2]} 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 (though still longer than those of living cats), and it is suggested to have a different ecology from Smilodon as pursuit predator adapted to running down large prey in open habitats, with species of the genus also proposed to have engaged in cooperative hunting.

History, taxonomy and evolution

Eurasia

The first fossils of this genus were scientifically described in 1846 by Richard Owen as the species Machairodus latidens, ^[3] based on Pleistocene aged canine teeth found in Kent’s Cavern in Devon, England by the Reverend John MacEnery in 1826. ^[4] The name Homotherium (Greek: ὁμός (homos, 'same') and θηρίον (therion, 'beast')) was proposed by Emilio Fabrini (1890), without further explanation, for a new subgenus of Machairodus, whose main distinguishing feature was the presence of a large diastema between the two inferior premolars. He further described two species in this new subgenus: Machairodus (Megantereon) crenatidens and Machairodus (Megantereon) nestianus. ^[5] In 1918, the species Homotherium moravicum was described by Woldřich. ^[6] In 1936, Teilhard de Chardin described the new species Homotherium ultimus based on fossils from the middle Pleistocene-aged Zhoukoudian cave complex near Beijing in northern China. ^[7] In 1972, a species Homotherium davitašvlii was described based on fragmentary material found at Kvabebi in Georgia. ^[8] Other material from Odessa in Ukraine was tentatively assigned to this species in 2004. ^[9] In 1986, the species Homotherium darvasicum was described based on material from Kuruksay, Turkey. ^[10] In 1989, another species Homotherium tielhardipiveteaui was named based on fossils from Tajikistan. ^[11] In 1996, Homotherium hengduanshanense was described based on fossils from the Hengduan Mountains of southwestern China. ^[12]

There is currently only one recognised species of Homotherium in Eurasia during the Late Pliocene-Pleistocene, Homotherium latidens; other species, including H. nestianus, H. sainzelli, H. crenatidens, H. nihowanensis, and H. ultimum, were proposed mainly on size differences, and do not appear to be distinct. ^[13]

Africa

In 1972 a species Homotherium problematicum (originally Megantereon problematicus) was named based on fragmentary material from the Makapansgat locality in South Africa, of late Pliocene-Early Pleistocene age. ^{[14] [15]} A second African species discovered in the Pliocene aged Hadar Formation of the Afar region of Ethiopia, Homotherium hadarensis, was described in 1988. ^[16] In 1990, Alan Turner challenged the validity of these two species, and later authors typically refrained from referring the African fossils to any specific species, ^[13] although in 2015, further material from the Hadar Formation was tentatively referred to H. hadarensis. ^[17] A third species, Homotherium africanum (originally Machairodus africanus), has also been included based on remains found in Aïn Brimba, in Tunisia, North Africa, ^{[18] [19] [20]} dating to the early-middle Pliocene, with other indeterminate remains of Homotherium being reported from the Ahl al Oughlam locality in Morocco, dating to the Late Pliocene. ^[21] In 2021, indeterminate remains of Homotherium were reported from the Tobène locality of Senegal, dating to the Early Pliocene. ^[22]

Americas

In 1905, Merriam described a new species Machaerodus ischyrus. ^[23] Subsequently, in 1918, Merriam reassigned it to a new genus Ischyrosmilus along with the new species Ischyrosmilus idahoensis. ^[24] The genus Dinobastis was originally named by Cope in 1893, with the type species Dinobastis serus. ^[25] In 1965, the species Ischyrosmilus johnstoni was described. In the same paper, it was noted that a comparative study of both Ischyrosmilus and Homotherium might conclude them as synonyms. ^[26]

In 1966, Churcher named Dinobastis a junior synonym of Homotherium, and recombined D. serus as Homotherium serum. ^[27] In 1970, a new species Ischyrosmilus crusafonti was described from the early Pleistocene of Nebraska. ^[28] In 1988, after some debate, the genus Ischyrosmilus was declared a junior synonym of Homotherium and all four species were reassigned to that genus as H. ischyrus, H. idahoensis, and H. johnstoni. The same paper also proposed keeping Dinobastis serus separate from Homotherium. ^[29] Up to five species have been recognised from North America: H. idahoensis, H. crusafonti, H. ischyrus, H. johnstoni, and H. serum, ^[30] while other authors suggest that there are only two species, with older Blancan (Pliocene-Early Pleistocene) specimens assigned to the species H. ischyrus, while the younger ones (mostly Late Pleistocene in age) are assigned to the species H. serum. H. serum is morphologically similar to the Eurasian H. latidens, which may suggest that they share a close common origin, with H. serum possibly originating from a migration of H. latidens into North America rather than from earlier North American Homotherium. ^[13]

Skeleton of the South American species "Homotherium" venezuelensis, which recent authors have suggested may be better placed in Xenosmilus

In 2005, a new species Homotherium venezuelensis was described based on fossils from the Pleistocene of Venezuela. ^[31] In 2022, it was proposed that Homotherium venezuelensis be reassigned to the genus Xenosmilus (a genus originally described for Early-Middle Pleistocene aged fossils found in Florida) ^[32] which was endorsed by another group of authors in 2024. ^[33] The 2022 study found that Xenosmilus was nested within Homotherium as traditionally defined, making Homotherium without including the species in Xenosmilus paraphyletic. ^[32]

Evolutionary history

The lineage of Homotherium is estimated (based on mitochondrial DNA sequences) to have diverged from that of Smilodon about 18 million years ago. ^[34] Homotherium has been suggested to have originated from African species of the genus Amphimachairodus. ^[22] Homotherium first appeared during the Early Pliocene, about 4 million years ago, with its oldest remains being from the Odesa catacombs in Ukraine, and Koobi Fora in Kenya, which are close in age, making the origin location of the genus uncertain. The genus arrived in North America during the late Pliocene (~3.6-2.6 million years ago). ^[13] Remains either attributed to Homotherium or Xenosmilus are known from Venezuela in northern South America, of an uncertain Early-Middle Pleistocene age. ^[35] On the African continent the genus disappeared about 1.5 million years ago, during the Early Pleistocene. ^[36] The latest records of Homotherium in Europe date to the late Middle Pleistocene, around 300-200,000 years ago, ^[37] with the exception of a single lower jaw bone from the North Sea which dates to around 28-30,000 years ago. ^[38] The mitochondrial genome of this specimen is nearly identical to specimens known from North America, suggesting that this may have represented a Late Pleistocene dispersal from North America, rather than a continuous undocumented occupation of the region. ^[34] In 2024, a mummy of a Homotherium latidens cub was reported from the Upper Pleistocene from the Badyarikha River, Yakutia in northeastern Siberia, dating to 35,471–37,019 years Before Present, marking the first recorded presence of the species in the Upper Pleistocene of Asia. ^[39] Homotherium serum became extinct in North America around 12,000 years ago as part of the end-Pleistocene extinction event of most large mammals across the Americas. ^[40]

Description

Size comparison of Homoterium serum

Cast of the fossil skulls of H. latidens (left) and H. serum (right).

Homotherium reached 1.1 m (3 ft 7 in) at the shoulder and weighed an estimated 190 kg (420 lb) and was therefore about the size of a male lion. ^{[41] [42]} In comparison to its likely ancestor Amphimachairodus, the upper incisors display stronger serration, are larger and more arched, the upper second premolar (P2) is always absent, and the upper and lower third premolars (P3 and p3) are smaller, and the morphology of the upper fourth premolar (P4) displays differences. ^[32] Homotherium had shorter upper canines than members of the machairodont tribe Smilodontini such as Smilodon or Megantereon , but these were still longer than those of extant cats. The incisors and lower canines of Homotherium formed a powerful puncturing and gripping device, and its large canine teeth were coarsely serrated. The jaws of Homotherium may have been adapted to clamp and hold prey while inflicting damage with the canine teeth, due to comparable amounts of trabecular bone present in skulls of the genus to those of the modern lion. ^{[43] [44]}

The large upper canines of Homotherium, which are distinctly flattened, ^[45] were likely hidden by the upper lips and gum tissues of the lower lips jaw similar to extant cats, unlike the larger upper canines of Smilodon. This hypothesis is further supported by comparable space between the canines and mandible at full closure of the jaws to modern cats; while Smilodon has significantly more space in this respect, likely for soft tissue to fit between the canine and mandible. ^[46]

Compared to Smilodon, the legs were proportionally longer, and the forelimbs were less powerfully built, being narrow and intermediate in form between those of cheetahs and lions. The neck was relatively long and thick with a high degree of flexibility, while the back was relatively short. The tail was very short. The claws were small and semi-retractable, the dewclaw being large, with the second phalanges being less asymmetrical than those of lions, giving the feet a dog-like posture. The part of the humerus closest to the foot was narrow, with the olecranon fossa being strongly vertical. The hindfeet were held in a raised digitigrade posture. Homotherium likely walked with a posture intermediate between that of living big cats and hyenas, similar to that of canines. ^[45]

Natural mummy of a three-week old H. latidens cub from Yakutia, Russia.

Preserved soft tissue of a three-week old cub of a H. latidens found in Siberia in 2020 and described in 2024 indicates that the coat color for juveniles of this species was a black or dark brown color with pale paws and chin. The fur on the corner of the mouth region and back of the neck were longer than on the forelimbs of the mummy. Additionally, the cub had wide, rounded paws, which lacked a carpal pad, and its fur was dense: adaptations to traversing snowy terrain effectively, showcasing these features developed at a young age. ^[39]

Paleoecology

Homotherium is suggested to have been adapted to the hunting of large prey. ^[45] The reduced claws, relatively slender and long limbs, and sloping back all appear to be adaptations for moderate speed endurance running in open habitats. ^{[47] [45]} The running-adapted morphology of its forelimbs suggests that they were less useful than those of Smilodon or many living big cats in restraining prey and that the incisors instead played a greater role than in living cats, like in hyenas and canines. ^[45] It has been suggested that Homotherium killed prey by slashing bites to the throat inflicted by its canines, though its style of prey restraint was probably different to that of Smilodon (which had more powerful forelimbs which helped to better restrain prey to protect its more fragile canines) with a killing technique more similar in some aspects to the clamp-and-hold technique used by living big cats like lions. ^[43] It has been speculated based on its adaptation to open habitats and high levels of competition from other carnivores, that Homotherium probably relied on group hunting. ^[45]

Analysis of the genome of a Homotherium specimen found in permafrost in Yukon suggests that Homotherium experienced positive selection for genes related to respiration and the circulatory system, which may have been adaptations for endurance running. Positive selection for genes related to vision indicates that sight probably played an important role in hunting, suggesting that Homotherium was a diurnal (day active) hunter. Selection for genes related to cognition were tentatively suggested by researchers to possibly support the social hunting hypothesis. ^[48] Dental microwear analysis of specimens of H. serum from North America suggests that Homotherium regularly consumed tough-fleshed prey, but did not consume bone. ^[44]

Isotopic analysis of H. latidens from the Venta Micena locality in southeast Spain dating to the Early Pleistocene, around 1.6 million years ago, suggests that at this locality H. latidens was the apex predator and hunted large prey in open habitats (likely including the equine Equus altidens , bison, as well as possibly juveniles of the mammoth Mammuthus meridionalis ) and niche partitioned with the sabertooth Megantereon (a close relative of Smilodon) and the "European jaguar" Panthera gombaszoegensis, which hunted somewhat smaller prey in forested habitats. ^[49]

Analysis of specimens from Punta Lucero in northern Spain, dating to the early Middle Pleistocene (600-400,000 years ago), suggests that H. latidens at this locality exclusively consumed large (from 45 kilograms (99 lb) to over 1,000 kilograms (2,200 lb)) prey, likely including aurochs, bison, red deer, and/or the giant deer Praemegaceros, and heavily overlapped in diet with the coexisting "European jaguar" Panthera gombaszoegensis. ^[50]

H. serum life restoration

At the Friesenhahn Cave site in Texas, which dates to the Late Pleistocene, the remains of almost 400 juvenile Columbian mammoths were discovered along with numerous Homotherium serum skeletons of all ages, from elderly specimens to cubs. ^[51] The sloped back and powerful lumbar section of Homotherium's vertebrae suggest a bear-like build, and thus that these animals could have been capable of pulling formidable loads; further, broken upper canines - a common injury in fossils of other machairodonts such as Machairodus and Smilodon that would have resulted from struggling with their prey - is not seen in Homotherium, perhaps because their social groups would completely restrain prey items before any of the cats attempted to kill the target with their saber teeth, or because the canines were less frail due to being covered. Moreover, the bones of the young mammoths found in Friesenhahn Cave show distinctive marks matching the incisors of Homotherium, indicating that they could efficiently process most of the meat on a carcass and that the mammoths had been deposited in the caves by the cats themselves and not by scavengers. Examination of the bones also indicates that the carcasses of these juvenile mammoths were dismembered after being killed by the cats before being dragged away, suggesting that Homotherium would disarticulate their kill to transport it to a safe area such as a hidden lair or den and prevent competitors such as dire wolves and American lions from usurping the carcass. ^[52] Isotopic analysis of H. serum dental remains at Friesenhahn Cave have confirmed that at this locality it fed on mammoths, along with other C₄ grazers, like bison and horses in open habitats. ^[44]

Isotopic analysis of H. serum specimens from Eastern Beringia (now Alaska and Yukon) suggests that in this region the species was not a specialised mammoth predator, and consumed a variety of large prey, likely including bison, muskox, horse and reindeer, as well as also probably woolly mammoths. ^[53]

Relationship with humans

Homotherium has a long history of co-occurence with archaic humans across Afro-Eurasia, ranging from Australopithecus in the Pliocene of Africa, to Homo erectus in Zhoukoudian cave in the Early-Middle Pleistocene of China and Homo heidelbergensis in the Middle Pleistocene of Europe. The seeming extinction of Homotherium latidens in Europe during the Middle Pleistocene may have been the result of competition with Homo heidelbergensis (in combination with the lion Panthera fossilis ). ^[47] Isotopic analysis of the canine teeth of H. latidens found in Kent's Cavern found that they were isotopically distinct from other animal remains found in the cave, suggesting that the teeth were deliberately transported into the cave by humans during the Palaeolithic from further afield, perhaps as a kind of trade good. The teeth are suggested to have experienced considerable weathering prior to being taken into Kent's Cavern, ^[54] and it is unclear whether these teeth were taken from the remains of relatively recently dead Homotherium or subfossil remains of long-dead Homotherium individuals. ^[4] At the end of the Late Pleistocene in North America, Homotherium serum co-existed with Palaeoindians, the first humans to inhabit the Americas. The effect of human hunting of large herbivores which H. serum relied upon may have been a contributory factor in its extinction along with other large carnivores in North America. ^[55]

See also

• Paleontologyportal

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External links

• The saber-toothed cat of the North Sea, 2008, accessed 10/28/2019
• American Scimitar Cat
• Saber-toothed cat jaw
• South America gets two more sabercats