Sarkastodon

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Sarkastodon
Temporal range: 45.0–39.9  Ma
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S
D
C
P
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Pg
N
Middle Eocene
Sarkastodon mongoliensis NT.jpg
Reconstruction of Sarkastodon mongoliensis
Sarkastodon scull AMNH.jpg
Skull reconstructions of Sarkastodon mongolensis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Oxyaenodonta
Family: Oxyaenidae
Subfamily: Oxyaeninae
Genus: Sarkastodon
Granger, 1938 [1]
Type species
Sarkastodon mongoliensis
Granger, 1938 [1]
Species
  • Sarkastodon henanensis(Tong & Lei, 1986) [2]
  • Sarkastodon mongoliensis(Granger, 1938)

Sarkastodon ("meaty tooth") is an extinct genus of placental mammals from extinct subfamily Oxyaeninae within extinct family Oxyaenidae, that lived in Asia (in today's China and Mongolia) during the middle Eocene. [1] It was a genus of large, carnivorous animals known only from a skull and jawbones. Sarkastodon was probably a hypercarnivore that preyed on large mammals in its range during the Middle Eocene, such as brontotheres, chalicotheres, and rhinoceroses. Its weight is estimated at 800 kg (1,800 lb), [3] and its length at 3 m (10 ft). [4]

Contents

Discovery

The type specimens of S. mongoliensis are known from Eocene deposits from the Irdin Manha Formation of Mongolia. Additional material referred to Sarkastodon is known from the Ulan Shireb beds (160 kilometres or 100 miles from the holotype locality) of Inner Mongolia. These specimens were discovered by Walter W. Granger in 1930, on an expedition to the Gobi Desert. [1]

Palaeobiology

Sarkastodon was a hypercarnivore, with hyaena-like dentition specialised in bone-cracking. [5] [6] The sharp, slicing premolars (which form roughly rectilinear cutting blades) [7] and crushing molars enabled Sarkastodon to eat both bone and flesh. [8] It was probably an ambush predator, not a fast runner. [4]

Related Research Articles

<span class="mw-page-title-main">Carnivore</span> Organism that eats mostly or exclusively animal tissue

A carnivore, or meat-eater, is an animal or plant whose food and energy requirements derive from the consumption of animal tissues whether through hunting or scavenging.

<i>Canis</i> Genus of carnivores

Canis is a genus of the Caninae which includes multiple extant species, such as wolves, dogs, coyotes, and golden jackals. Species of this genus are distinguished by their moderate to large size, their massive, well-developed skulls and dentition, long legs, and comparatively short ears and tails.

<i>Didelphodon</i> Genus of extinct opossum

Didelphodon is a genus of stagodont metatherians from the Late Cretaceous of North America.

<span class="mw-page-title-main">Creodonta</span> Former order of extinct flesh-eating placental mammals

Creodonta is a former order of extinct carnivorous placental mammals that lived from the early Paleocene to the late Miocene epochs in North America, Europe, Asia and Africa. Originally thought to be a single group of animals ancestral to the modern Carnivora, this order is now usually considered a polyphyletic assemblage of two different groups, the Oxyaenids and the Hyenodonts, not a natural group. Oxyaenids are first known from the Palaeocene of North America, while hyaenodonts hail from the Palaeocene of Africa.

<i>Repenomamus</i> Extinct genus of mammals

Repenomamus is a genus of opossum- to badger-sized gobiconodontid mammal containing two species, Repenomamus robustus and Repenomamus giganticus. Both species are known from fossils found in China that date to the early Cretaceous period, about 125-123.2 million years ago. R. robustus is one of several Mesozoic mammals for which there is good evidence that it fed on vertebrates, including dinosaurs. Though it is not entirely clear whether or not these animals primarily hunted live dinosaurs or scavenged dead ones, evidence for the former is present in fossilized remains showcasing the results of what was most likely a predation attempt by R. robustus directed at a specimen of the dinosaur Psittacosaurus lujiatunensis. R. giganticus is among the largest mammals known from the Mesozoic era, only surpassed by Patagomaia.

<span class="mw-page-title-main">Mesonychia</span> Extinct taxon of carnivorous ungulates

Mesonychia is an extinct taxon of small- to large-sized carnivorous ungulates related to artiodactyls. Mesonychians first appeared in the early Paleocene, went into a sharp decline at the end of the Eocene, and died out entirely when the last genus, Mongolestes, became extinct in the early Oligocene. In Asia, the record of their history suggests they grew gradually larger and more predatory over time, then shifted to scavenging and bone-crushing lifestyles before the group became extinct.

<i>Ekorus</i> Extinct species of carnivoran

Ekorus ekakeran is a large, extinct mustelid mammal. Fossils, including largely complete skeletons, are known from the late Miocene of Kenya.

<span class="mw-page-title-main">Sparassodonta</span> Extinct order of mammals

Sparassodonta is an extinct order of carnivorous metatherian mammals native to South America, related to modern marsupials. They were once considered to be true marsupials, but are now thought to be a separate side branch that split before the last common ancestor of all modern marsupials. A number of these mammalian predators closely resemble placental predators that evolved separately on other continents, and are cited frequently as examples of convergent evolution. They were first described by Florentino Ameghino, from fossils found in the Santa Cruz beds of Patagonia. Sparassodonts were present throughout South America's long period of "splendid isolation" during the Cenozoic; during this time, they shared the niches for large warm-blooded predators with the flightless terror birds. Previously, it was thought that these mammals died out in the face of competition from "more competitive" placental carnivorans during the Pliocene Great American Interchange, but more recent research has showed that sparassodonts died out long before eutherian carnivores arrived in South America. Sparassodonts have been referred to as borhyaenoids by some authors, but currently the term Borhyaenoidea refers to a restricted subgroup of sparassodonts comprising borhyaenids and their close relatives.

<i>Thylacosmilus</i> Extinct genus of mammals

Thylacosmilus is an extinct genus of saber-toothed metatherian mammals that inhabited South America from the Late Miocene to Pliocene epochs. Though Thylacosmilus looks similar to the "saber-toothed cats", it was not a felid, like the well-known North American Smilodon, but a sparassodont, a group closely related to marsupials, and only superficially resembled other saber-toothed mammals due to convergent evolution. A 2005 study found that the bite forces of Thylacosmilus and Smilodon were low, which indicates the killing-techniques of saber-toothed animals differed from those of extant species. Remains of Thylacosmilus have been found primarily in Catamarca, Entre Ríos, and La Pampa Provinces in northern Argentina.

<i>Megistotherium</i> Hyaenodontid creodont genus from early Miocene epoch

Megistotherium is an extinct genus of hyaenodont belonging to the family Hyainailouridae that lived in Africa.

<i>Hyaenodon</i> Extinct genus of mammals

Hyaenodon ("hyena-tooth") is an extinct genus of carnivorous placental mammals from extinct tribe Hyaenodontini within extinct subfamily Hyaenodontinae, that lived in Eurasia and North America from the middle Eocene, throughout the Oligocene, to the early Miocene.

<i>Epicyon</i> Genus of carnivores

Epicyon is a large, extinct, canid genus of the subfamily Borophaginae, native to North America. Epicyon existed for about 15 million years from the Hemingfordian age of the Early Miocene, to the Hemphillian of the Late Miocene. Epicyon is the largest known canid of all time, with the type species reaching 2.4 m (7.9 ft) in length, 90 cm (35 in) in shoulder height and approximately 100–125 kg (220–276 lb) in body mass. The largest known humerus specimen belonged to an individual weighing up to 170 kg (370 lb).

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

Oxyaena is an extinct genus of placental mammals from extinct subfamily Oxyaeninae within extinct family Oxyaenidae, that lived in Europe, Asia and North America during the early Eocene.

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

Hoplophoneus is an extinct genus of the family Nimravidae, endemic to North America during the Late Eocene to Early Oligocene epochs, existing for approximately 6 million years.

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

Asiavorator is an extinct genus of civet-like carnivoran belonging in the family Stenoplesictidae. It was endemic to Asia and lived during the Eocene and Oligocene epochs.

<span class="mw-page-title-main">Brontotheriidae</span> Extinct family of odd-toed ungulates

Brontotheriidae is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs. Superficially, they looked rather like rhinos with some developing bony nose horns, and were some of the earliest mammals to have evolved large body sizes. They lived around 56–34 million years ago, until the very close of the Eocene.

<span class="mw-page-title-main">Hyaenodonta</span> Extinct order of mammals

Hyaenodonta is an extinct order of hypercarnivorous placental mammals of clade Pan-Carnivora from mirorder Ferae. Hyaenodonts were important mammalian predators that arose during the early Paleocene in Europe and persisted well into the late Miocene.

<i>Viverravus</i> Extinct genus of mammals

Viverravus is an extinct genus of placental mammals from extinct subfamily Viverravinae within extinct family Viverravidae, that lived in North America, Europe and Asia from the middle Paleocene to middle Eocene.

<i>Simbakubwa</i> Extinct genus of mammals

Simbakubwa is an extinct genus of hyaenodonts to the family Hyainailourinae that lived in Kenya during the early Miocene.

<i>Proborhyaena</i> Extinct genus of metatherians

Proborhyaena is an extinct genus of proborhyaenid sparassodont that lived during the Oligocene of what is now South America. It is considered to be the largest of the sparassodonts.

References

  1. 1 2 3 4 Granger, W. (1938.) "A giant oxyaenid from the upper Eocene of Mongolia." American Museum Novitates969.
  2. Y. Tong and Y. Lei (1986.) "Fossil Creodonts and Carnivores (Mammalia) from the Hetaoyuan Eocene of Henan." Vertebrata PalAsiatica 24(3):210-221
  3. Sorkin, B. (2008). "A biomechanical constraint on body mass in terrestrial mammalian predators". Lethaia . 41 (4): 333–347. Bibcode:2008Letha..41..333S. doi:10.1111/j.1502-3931.2007.00091.x.
  4. 1 2 Prothero, Donald R. (2016). The Princeton Field Guide to Prehistoric Mammals. Princeton University Press. p. 125. ISBN   9781400884452.
  5. Rose KD. (2006.) The Beginning of the Age of Mammals. JHU Press: page 122
  6. Werdelin, L. (1989). "Constraints and adaptations in the bone-cracking canid Osteoborus (Mammalia: Canidae)". Paleobiology. 15 (4): 387–401. Bibcode:1989Pbio...15..387W. doi:10.1017/S009483730000957X. S2CID   82128868.
  7. Muizon, C. de; Lange-Badré, B. (2007). "Carnivorous dental adaptations in tribosphenic mammals and phylogenetic reconstruction". Lethaia. 30 (4): 353–366. doi:10.1111/j.1502-3931.1997.tb00481.x.
  8. Gunnell, GF. (1998.) "Creodonta", p. 91-109. In: Janis CM., Scott K.M., and Jacobs LL. (eds.). Evolution of Tertiary Mammals of North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge.