Allosaurus

  • allosaurus
    temporal range: late jurassic, 155–145 ma
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    allosaurus sdnhm (1).jpg
    mounted a. fragilis skeleton cast, san diego natural history museum
    scientific classification e
    kingdom: animalia
    phylum: chordata
    clade: dinosauria
    clade: saurischia
    clade: theropoda
    family: allosauridae
    subfamily: allosaurinae
    marsh, 1878
    genus: allosaurus
    marsh, 1877
    type species
    allosaurus fragilis
    marsh, 1877
    species[1]
    • a. fragilis marsh, 1877
    • a. europaeus mateus et al., 2006
    • a. jimmadseni chure & loewen, 2020
    synonyms

    allosaurus (s/[2][3]) is a genus of carnivorous theropod dinosaur that lived 155 to 145 million years ago during the late jurassic period (kimmeridgian to late tithonian[4]). the name "allosaurus" means "different lizard" alluding to its unique concave vertebrae (at the time of its discovery). it is derived from the greek ἄλλος (allos) ("different, other") and σαῦρος (sauros) ("lizard / generic reptile"). the first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist othniel charles marsh. as one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles.

    allosaurus was a large bipedal predator. its skull was large and equipped with dozens of sharp, serrated teeth. it averaged 9.5 metres (31 ft) in length, though fragmentary remains suggest it could have reached over 12 m (39 ft). relative to the large and powerful hindlimbs, its three-fingered forelimbs were small, and the body was balanced by a long and heavily muscled tail. it is classified as an allosaurid, a type of carnosaurian theropod dinosaur. the genus has a complicated taxonomy, and includes 5-6 valid species (later whittled down to three valid species as of 2020), the best known of which is a. fragilis. the bulk of allosaurus remains have come from north america's morrison formation, with material also known from portugal. it was known for over half of the 20th century as antrodemus, but a study of the copious remains from the cleveland-lloyd dinosaur quarry brought the name "allosaurus" back to prominence and established it as one of the best-known dinosaurs.

    as the most abundant large predator in the morrison formation, allosaurus was at the top of the food chain, probably preying on contemporaneous large herbivorous dinosaurs, and perhaps even other predators. potential prey included ornithopods, stegosaurids, and sauropods. some paleontologists interpret allosaurus as having had cooperative social behavior, and hunting in packs, while others believe individuals may have been aggressive toward each other, and that congregations of this genus are the result of lone individuals feeding on the same carcasses.

  • description
  • discovery and history
  • classification
  • paleobiology
  • paleoecology
  • references
  • external links

Allosaurus
Temporal range: Late Jurassic, 155–145 Ma
Allosaurus SDNHM (1).jpg
Mounted A. fragilis skeleton cast, San Diego Natural History Museum
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Family: Allosauridae
Subfamily: Allosaurinae
Marsh, 1878
Genus: Allosaurus
Marsh, 1877
Type species
Allosaurus fragilis
Marsh, 1877
Species[1]
  • A. fragilis Marsh, 1877
  • A. europaeus Mateus et al., 2006
  • A. jimmadseni Chure & Loewen, 2020
Synonyms

Allosaurus (s/[2][3]) is a genus of carnivorous theropod dinosaur that lived 155 to 145 million years ago during the late Jurassic period (Kimmeridgian to late Tithonian[4]). The name "Allosaurus" means "different lizard" alluding to its unique concave vertebrae (at the time of its discovery). It is derived from the Greek ἄλλος (allos) ("different, other") and σαῦρος (sauros) ("lizard / generic reptile"). The first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles.

Allosaurus was a large bipedal predator. Its skull was large and equipped with dozens of sharp, serrated teeth. It averaged 9.5 metres (31 ft) in length, though fragmentary remains suggest it could have reached over 12 m (39 ft). Relative to the large and powerful hindlimbs, its three-fingered forelimbs were small, and the body was balanced by a long and heavily muscled tail. It is classified as an allosaurid, a type of carnosaurian theropod dinosaur. The genus has a complicated taxonomy, and includes 5-6 valid species (later whittled down to three valid species as of 2020), the best known of which is A. fragilis. The bulk of Allosaurus remains have come from North America's Morrison Formation, with material also known from Portugal. It was known for over half of the 20th century as Antrodemus, but a study of the copious remains from the Cleveland-Lloyd Dinosaur Quarry brought the name "Allosaurus" back to prominence and established it as one of the best-known dinosaurs.

As the most abundant large predator in the Morrison Formation, Allosaurus was at the top of the food chain, probably preying on contemporaneous large herbivorous dinosaurs, and perhaps even other predators. Potential prey included ornithopods, stegosaurids, and sauropods. Some paleontologists interpret Allosaurus as having had cooperative social behavior, and hunting in packs, while others believe individuals may have been aggressive toward each other, and that congregations of this genus are the result of lone individuals feeding on the same carcasses.

Other Languages
Afrikaans: Allosaurus
العربية: ألوصور
asturianu: Allosaurus
azərbaycanca: Allosaurus
български: Алозаври
brezhoneg: Allosaurus
català: Al·losaure
čeština: Allosaurus
dansk: Allosaurus
Deutsch: Allosaurus
Ελληνικά: Αλλόσαυρος
español: Allosaurus
Esperanto: Alosaŭro
euskara: Allosaurus
فارسی: آلوسور
français: Allosaurus
galego: Allosaurus
հայերեն: Ալոզավրեր
hrvatski: Alosaur
Bahasa Indonesia: Allosaurus
italiano: Allosaurus
עברית: אלוזאורוס
ქართული: ალოზავრები
Latina: Allosaurus
latviešu: Allozaurs
lietuvių: Alozauras
magyar: Allosaurus
മലയാളം: അല്ലോസോറസ്
Bahasa Melayu: Allosaurus
မြန်မာဘာသာ: အယ်လိုဆောရတ်
Nederlands: Allosaurus
norsk: Allosaurus
norsk nynorsk: Allosaurus
occitan: Allosaurus
ଓଡ଼ିଆ: ଏଲୋସରସ
polski: Allozaur
português: Alossauro
română: Allosaurus
русский: Аллозавры
Scots: Allosaurus
Simple English: Allosaurus
slovenčina: Allosaurus
српски / srpski: Алосаур
srpskohrvatski / српскохрватски: Alosaurus
suomi: Allosaurus
svenska: Allosaurus
Tagalog: Allosaurus
Türkçe: Allosaurus
українська: Алозавр
Tiếng Việt: Allosaurus
Winaray: Allosaurus
中文: 異特龍屬