Equus namadicus

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Equus namadicus
Temporal range: Pleistocene
Equus namadicus.JPG
Fossil
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Genus: Equus
Species:
E. namadicus
Binomial name
Equus namadicus
Falconer and Cautley, 1849

Equus namadicus is a prehistoric equid, known from remains dating to the Middle and Late Pleistocene from across the Indian subcontinent, with its last dated records being approximately 29-14,000 years ago. [1] It is considered a "stenonine horse", meaning that it is probably more closely related to zebras and asses than true horses. It is relatively large in size. [2] It is very similar to the earlier Equus sivalensis, also from the Indian subcontinent, from which it only differs in size and in subtle aspects of dental anatomy, [3] and it has sometimes been suggested to be a synonym of it. [4]

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Palaeoloxodon huaihoensis is an extinct species of elephant belonging to the genus Palaeoloxodon known from the Pleistocene of China. It was first named a subspecies of P. naumanni by J. Liu in 1977 based on a partial skeleton from Huaiyuan, Anhui, and was later elevated to species rank by G. Qi in 1999, who also included remains found in the Penghu Channel between the Penghu archipelago and Taiwan. The Penghu Channel remains are suggested to date to the Middle and Late Pleistocene. A mostly complete adult skull from Late Pleistoene Nihewan basin in Hebei may be referrable to this species. The body size is very large, comparable to Indian Palaeoloxodon namadicus and the European straight-tusked elephant. In comparison to Indian P. namadicus, the postcranial skeleton is substantially more robust, and greatly resembles that of P. antiquus. The morphology of IVPP V4443 is also overall more similar to that of P. antiquus than P. namadicus, but the parietal-occipital crest at the top of the skull displays a very robust morphology closer to that of P. namadicus. The oldest remains of Palaeoloxodon in North China date to the early Middle Pleistocene, around 700,000 years ago. The latest dates for Palaeoloxodon in China are from the Late Pleistocene, and a Holocene survival is not substantiated. Mitochondrial genomes retrieved from Chinese Palaeoloxodon individuals from North China reveal that like the European P. antiquus, they harboured mitochondrial lineages derived from those of African forest elephants as a result of hybridisation with that species prior to Palaeoloxodon leaving Africa.

References

  1. Jukar, A. M.; Lyons, S. K.; Wagner, P. J.; Uhen, M. D. (2021-01-15). "Late Quaternary extinctions in the Indian Subcontinent". Palaeogeography, Palaeoclimatology, Palaeoecology. 562: 110137. Bibcode:2021PPP...56210137J. doi: 10.1016/j.palaeo.2020.110137 . ISSN   0031-0182. S2CID   228877664.
  2. Cirilli, Omar; Machado, Helena; Arroyo-Cabrales, Joaquin; Barrón-Ortiz, Christina I.; Davis, Edward; Jass, Christopher N.; Jukar, Advait M.; Landry, Zoe; Marín-Leyva, Alejandro H.; Pandolfi, Luca; Pushkina, Diana; Rook, Lorenzo; Saarinen, Juha; Scott, Eric; Semprebon, Gina (September 2022). "Evolution of the Family Equidae, Subfamily Equinae, in North, Central and South America, Eurasia and Africa during the Plio-Pleistocene". Biology. 11 (9): 1258. doi: 10.3390/biology11091258 . ISSN   2079-7737. PMC   9495906 . PMID   36138737.
  3. Azzaroli, A. (1990), Lindsay, Everett H.; Fahlbusch, Volker; Mein, Pierre (eds.), "The Genus Equus in Europe", European Neogene Mammal Chronology, Boston, MA: Springer US, pp. 339–356, doi:10.1007/978-1-4899-2513-8_20, ISBN   978-1-4899-2515-2 , retrieved 2022-06-28
  4. Sun, Boyang; Liu, Wenhui; Liu, Jinyuan; Liu, Li; Jin, Changzhu (July 2021). "Equus qingyangensis in Jinyuan Cave and its palaeozoographic significance". Quaternary International. 591: 35–46. Bibcode:2021QuInt.591...35S. doi: 10.1016/j.quaint.2020.10.076 . S2CID   228830965.