Thylacinidae

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Thylacinidae
Temporal range: Late Oligocene - Holocene
Thylacinus.jpg
Thylacine
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Dasyuromorphia
Family: Thylacinidae
C.L. Bonaparte, 1838
Genera

All extinct, see text

Thylacinidae is an extinct family of carnivorous, superficially dog-like marsupials from the order Dasyuromorphia. The only species to survive into modern times was the thylacine (Thylacinus cynocephalus), which became extinct in 1936.

Contents

The consensus on placement of the family is with the Dasyuromorphia order, with agreement on the divergence this family and the Dasyuridae, represented by the extant quolls and Tasmanian devil Sarcophilus harrisii , remaining under consideration.

The thylacinid family was represented by two species in a synonymy published in 1982, the recently extinct Tasmanian tiger and the species Thylacinus potens , known by fossil material. Discoveries of new material, especially in well researched fossil depositions at the Riversleigh World Heritage Area, revealed a diverse array of genera and families existing during Miocene epoch. The dentition of specimens and some largely complete crania showed the development of specialist predators capable of hunting and consuming a range of vertebrate species, and like other mammalian predators, such as the canid family, could include herbivores larger than themselves. An assessment of the size range of the species has provided evidence of animals occupying a greater number of trophic levels and challenged the conception of the dominance of reptilians as large hyper-carnivorous predators on the Australia continent. [1]

The consensus of authors prior to 1982 was that the thylacinid family were related to the borhyaenidae, a group of South American predators, also extinct, that exhibited many similar characteristics of dentition. A review published in 1982 compared the skeletal structure of these groups, concluding the tarsal bones show greater affinity with the dasyurmorphs, strongly supporting the later theory that any dental similarities emerged independently. [2]

Another family, the Thylacoleonidae, were also large carnivorous marsupials, but allied to the order Vombatiformes and assumed to have also evolutionarily converged as predators of large herbivores.

Genera

Family Thylacinidae, extinct

Related Research Articles

Dasyuromorphia Taxon of carnivorous marsupials

Dasyuromorphia is an order comprising most of the Australian carnivorous marsupials, including quolls, dunnarts, the numbat, the Tasmanian devil, and the thylacine. In Australia, the exceptions include the omnivorous bandicoots and the marsupial moles. Numerous South American species of marsupials are also carnivorous, as were some extinct members of the order Diprotodontia, including extinct kangaroos and thylacoleonids, and some members of the partially extinct clade Metatheria and all members of the extinct superorder Sparassodonta.

Bandicoot

Bandicoots are a group of more than 20 species of small to medium-sized, terrestrial marsupial omnivores in the order Peramelemorphia. They are endemic to the Australia–New Guinea region, including the Bismarck Archipelago and, marginally, in Indonesia (Seram).

<i>Thylacinus</i>

Thylacinus is a genus of extinct carnivorous marsupials from the order Dasyuromorphia. The only recent member was the thylacine, commonly also known as the Tasmanian tiger or Tasmanian wolf, which became extinct in 1936 due to excessive hunting by humans. Other prehistoric species are known from this genus. An unidentified species is known from Pleistocene New Guinea.

<i>Nimbacinus dicksoni</i>

Nimbacinus dicksoni was an ancient thylacine a distant relative of the modern but extinct thylacinid known as the Tasmanian tiger. It lived approximately 23-16 million years ago in the Miocene period. Nimbacinus dicksoni was about 1.6 ft (50 cm) long. Being a predator, it likely ate birds, small mammals, and reptiles. Like the modern thylacine, it may have been an awkward runner and used stamina to catch prey rather than speed. Fossils have been found in Australia at Riversleigh in north-western Queensland and Bullock Creek in the Northern Territory.

Thylacoleonidae

Thylacoleonidae is a family of extinct meat-eating marsupials from Australia, referred to as marsupial lions. The best known is Thylacoleo carnifex, also called the marsupial lion. The clade ranged from the Late Oligocene to the Pleistocene, with some species the size of a possum and others as large as a leopard. As a whole, they were largely arboreal, in contrast to the mostly terrestrial dasyuromorphs, monitor lizards and mekosuchines.

Badjcinus turnbulli is an extinct thylacinid marsupial.

The genus Nimbacinus contains two species of carnivorous, quadrupedal marsupials in Australia both of which are extinct:

Thylacinus macknessi lived during the early Miocene and is the oldest known member of the genus Thylacinus. It is named after Brian Mackness, a supporter of Australian vertebrate paleontology.

<i>Thylacinus megiriani</i>

Thylacinus megiriani lived during the late Miocene, 8 million years ago; the area T. megiriani inhabited in the Northern Territory was covered in forest with a permanent supply of water.

Maximucinus muirheadae lived from the late Oligocene to middle Miocene and is the largest thylacinid species known to have lived in Australia from the late Oligocene to the middle Miocene. The species was a quadrupedal marsupial predator, that in appearance looked similar to a dog with a long snout. Its molar teeth were specialized for carnivory; the cups and crest were reduced or elongated to give the molars a cutting blade. It is estimated to have weighed about 18 kilograms.

Muribacinus gadiyuli lived during the middle Miocene in Riversleigh. The species name comes from Wanyi aboriginal word for "little", in reference to its considerably small size compared to the modern thylacine and was similar in size to a fox-terrier dog, and "father" for the ancestral characteristics of the fossilised teeth.

Mutpuracinus archibaldi is an extinct carnivorous, quadrupedal marsupial that lived during the middle Miocene and is the smallest known thylacinid at approximately 1.1 kilograms, the size of a quoll, though, more closely related to the recently extinct thylacine.

Ngamalacinus timmulvaneyi lived during the early Miocene and has been found in Riversleigh.

Nimbacinus richi lived during the middle Miocene and has been found in deposits in Bullock Creek in the Northern Territory of Australia.

Wabulacinus ridei lived during the early Miocene in Riversleigh. It is named after David Ride, who made the first revision of thylacinid fossils. The material was found in system C of the Camel Spurtum assembledge.

Riversleigh fauna is the collective term for any species of animal identified in fossil sites located in the Riversleigh World Heritage Area.

Joculusium muizoni is a fossil species discovered at the Riversleigh World Heritage Area. Little is known about the animal.

Ekaltadeta ima is a species of potoroid marsupial that existed in Miocene Australia.

Thylacinus yorkellus is a fossil species of carnivorous marsupial, a sister species of the recently extinct Thylacinus cynocephalus, the Tasmanian tiger, both of which existed on mainland Australia.

William D. Turnbull (1922-2011) was an American paleontologist associated with the Chicago Field Museum. He published over 100 papers on mammals, continuing after his retirement as the museum's curator of mammals. He searched in Australia for evidence of recently extinct species, and made frequent expeditions to sites at the Washakie Formation in southwest Wyoming. His studies are considered significant contributions to the paleontology and biogeography of dinosaurs and Eocene mammals.

References

  1. 1 2 Wroe, S. (2001). "Maximucinus muirheadae, gen. et sp. nov. (Thylacinidae : Marsupialia), from the Miocene of Riversleigh, north-western Queensland, with estimates of body weights for fossil thylacinids". Australian Journal of Zoology. 49 (6): 603. doi:10.1071/ZO01044. S2CID   32417772.
  2. Long, J.A.; Archer, M. (2002). Prehistoric Mammals of Australia and New Guinea: One Hundred Million Years of Evolution. UNSW Press. p. 60. ISBN   9780868404356.
  3. Muirhead, Jeanette; Wroe, Stephen (September 1998). "A New Genus and Species, Badjcinus turnbulli (Thylacinidae: Marsupialia), from the Late-Oligocene of Riversleigh, Northern Australia, and an Investigation of Thylacinid Phylogeny". Journal of Vertebrate Paleontology. 18 (3): 612–626. doi:10.1080/02724634.1998.10011088.
  4. Wroe, Stephen (1995). "Muribacinus gadiyuli (Thylacinidae: Marsupialia), a very plesiomorphic thylacinid from the Miocene of Riversleigh, northwestern Queensland, and the problem of paraphyly for the Dasyuridae (Marsupialia)". Journal of Paleontology. 70 (6): 1032–1044. doi:10.1017/S0022336000038737.
  5. 1 2 Murray, P.; Megirian, D. (2000). "Two New Genera and Three New Species of Thylacinidae (Marsupialia) from the Miocene of the Northern Territory, Australia". The Beagle : Occasional Papers of the Northern Territory Museum of Arts and Sciences. 16: 145–162.
  6. 1 2 Muirhead, J. (1997). "Two new early Miocene thylacines from Riversleigh, northwestern Queensland". Memoirs of the Queensland Museum. 41: 367–377.
  7. Muirhead, J.; Archer, M. (1990). "Nimbacinus dicksoni, a plesiomorphic thylacine (Marsupialia: Thylacinidae) from Tertiary deposits of Queensland and the Northern Territory". Memoirs of the Queensland Museum. 28: 203–221.