The American lion is a wiped out animal that began in North America and is acknowledged to have colonized northwestern South America as a component of the Great American Interchange.[4] (However, the fossil stays found in Peru may truly identify with broad jaguars.[5][6]) The head-body length of the American lion is evaluated to have been 1.6–2.5 m (5 ft 3 in–8 ft 2 in)[7] and it would have stood 1.2 m (4 ft) at the shoulder. In like manner, it was tinier than its contemporary opponent for prey, the titan short-faced bear, which was the greatest carnivoran of North America at the time. The American lion was not as overwhelmingly manufactured as the saber-toothed cat Smilodon populator, which may have weighed up to 400 kg (880 lb).[8] Sorkin (2008) assessed the American lion to weigh around 420 kg (930 lb),[9][10] however a later study showed an ordinary weight for gentlemen of 256 kg (564 lb) and 351 kg (774 lb) for the greatest illustration analyzed.[11]
Around 100 illustrations of American lions have been recovered from the La Brea Tar Pits, in Los Angeles, so their body structure is unquestionably caught on. The parts and teeth of the wiped out American lion unequivocally look like cutting edge lions, yet they were widely greater. The American lion is acknowledged to be the greatest subspecies of lion.The American lion was at initially considered an unmistakable sorts of Pantherinae, with the consistent name Panthera atrox/ˈpænθərə ˈætrɒks/, which implies "savage" or "fearsome panther" in Latin. By and large, the skull of this cat was most like that of the jaguar (P. onca). Some later makers recognized this point of view, however distinctive masters considered the American lion most immovably related to the African lion (P. leo) and its wiped out Eurasian relative, the opening lion (P. leo spelaea or P. spelaea). Later scientistss consigned the wiped out American catlike as a subspecies of P. leo (P. leo atrox) rather than as an alternate species.[11][note 1]
Cladistic studies using morphological qualities have been not ready to focus the phylogenetic position of the American lion. No under one force considers the American lion (close by the natural hollow lion), to be more immovably related to the tiger, P. tigris, refering to an examination of skull shapes; the braincase, particularly, emits an impression of being especially like the braincase of a tiger.[12] The American lion and Eurasian sinkhole lion were furthermore proposed to be dynamic branches of a lineage inciting a surviving lion-jaguar clade.[13] A later study taking a gander at the skull, jaw, and teeth of the American lion with diverse pantherines shut it was not a lion and was specific from each and every surviving specie. The makers proposed it may have risen up out of pantherines that moved into North America in the mid-Pleistocene age and offered rising to both American lions and jaguars (P. onca).[11] Another morphological study gathered the American lion with P. leo and P. tigris, and ascribed resemblances to P. onca to simultaneous evolution.[14]
Skull at the National Museum of Natural History
Nevertheless, mitochondrial DNA plan data from stays of the American lion from Wyoming and Alberta uncover to it is a sister ancestry to the empty lion, and likely developed when an early surrender lion masses got the opportunity to be separated south of the North American territory ice sheet. The most recent general antecedent of the two masses clearly lived around 340,000 (194,000–489,000) years ago.[1] The most recent fundamental begetter of the P. atrox set of relatives is surveyed to have lived around 200,000 (118,000–246,000) years back. The dates construe that innate separation from P. spelaea had begun when of the Illinoian glaciation, around 300,000–130,000 years back (a spelaea people is known not been accessible in eastern Beringia by that period, where it persevered until no under 11,925 ± 70 years ago[1]). This part was kept up in the midst of the Sangamon interglacial, around 130,000–110,000 years former, and in the midst of later interstadials of the earlier glaciation and those of the going with Wisconsinan glaciation, around 110,000–10,000 years back. Boreal woodlands may have added to the separation in the midst of more blazing breaks; then again, a species impediment may have existed.[1] The study similarly demonstrates the present-day lion is the closest surviving relative of P. atrox and P. spelaea.[1] (The same study shows Eurasian and Beringian opening lions to be innately indistinguishable.[1])
In a couple zones of its range, the American lion lived under chilly climatic conditions. They probably used gives in or crevices for safe house from the cold weather.[17] They may have lined their nests with grass or leaves, as the Siberian tiger does, another exceptional cat that at present lives in the north.[17]
Less American lions are in the La Brea tar pits than distinctive predators, for instance, saber-toothed cats (Smilodon fatalis) or basic wolves (Canis dirus), which proposes they may have been adequately splendid to evade the hazard.[3] American lions likely followed North American deer, stallions (now wiped out), camels, and tapirs, and American wild ox, mammoths, and other gigantic, herbivorous animals.[17][18] This species vanished about the same time as other megafaunal species in the midst of the Quaternary demolition event, which wiped out an impressive parcel of the species on which the American lion would have preyed. Lion bones have been found in the garbage stores of Paleolithic American Indians, proposing human predation may have added to its extinction.[7][17]
A duplicate of the jaw of the first case of American lion found can be seen in the hand of a statue of researcher Joseph Leidy, which is at this time staying outside th
No comments:
Post a Comment