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Acristavus

Izina risobanura: “crestless grandfather”1

Yaryaga: IbimeraIminwa y'imbataKiretase ya nyuma

Acristavus was a duck-billed dinosaur that lived about 80 million years ago. It had no crest on its head, which is unusual for its family. This plant-eater walked on two legs and could also move on all fours.1 2

Yabayeho

hashize imyaka miliyoni 84 kugeza 725

Kiretase ya nyuma

Ibisigazwa byabonetse muri

Montana and Utah, USA5

Uburebure

8 kugeza 9 m (26 kugeza 30 ft)1

Uburemere

toni 2 kugeza toni 3 (4 400 kugeza 6 600 lb)1

Ubutumburuke

2,5 kugeza 3 m (8,2 kugeza 9,8 ft)1

Umuvuduko wo hejuru

nka 26 km/h (16 mph)

Kwiruka, igereranya

Yabayeho ryari?

Triyasike

Jurasike

Kiretase

Hashize miliyoni 252 z'imyaka20114566, asiteroyide

Yanganaga ite?

Yari ndende ite?

Ubutumburuke bwayo bwanganaga iki?

Yari iremereye ite?

iremereye nk'imodoka 2

ndende nk'imodoka 2 ziparitse ku murongondende nk'imineke 50 ikurikiranyeiremereye nk'imbwa 150iremereye nk'imbuto 600 za watermeloniremereye nk'ibyumba 4 by'amashuri byuzuye abanairemereye nk'idubu 7 zo mu ruburayashoboraga kwiruka metero 100 mu masegonda 14 (umuntu wihuta kurusha abandi akenera 9,6)

Acristavus yanganaga ite ugereranyije NAWE?

Ni imibare gusa ibarirwa muri mushakisha yawe. Nta kintu kibikwa cyangwa cyoherezwa ahandi.

Yihutaga ite?

Umuntu ugenda n'amaguru nka 5 km/h (3 mph)

Umwana ku igare nka 12 km/h (7 mph)

Acristavus nka 26 km/h (16 mph)

Ifarashi yiruka cyane nka 65 km/h (40 mph)

Ingwe yihuta cyane nka 100 km/h (62 mph)

utuntu twiza cyane

Utuntu dushimishije

Acristavus means 'crestless grandfather' because it is one of the oldest known duck-billed dinosaurs without a head crest.1

Its fossils were found in the Two Medicine Formation of Montana and the Wahweap Formation of Utah.5

Acristavus lived during the Campanian stage of the Late Cretaceous, about 83 to 72 million years ago.1

It belonged to a group called Brachylophosaurini, which includes other duck-billed dinosaurs like Brachylophosaurus.1

The type specimen, named MOR 1155, is a partial skeleton that helped scientists identify this species.5

Acristavus was a ground-dwelling herbivore that laid eggs, like all duck-billed dinosaurs.2

Ishusho ya Acristavus yakozwe na AI — Ishusho yakozwe na AI yerekana uko Acristavus ishobora kuba yari isa, yakozwe na mudasobwa hashingiwe ku byo abahanga bazi. Ni ugukeka gusa: inyamaswa nyayo ishobora kuba yari isa ukundi, kandi nta muntu uzi amabara yayo nyayo.

wabajije

Ibibazo bibazwa cyane kuri Acristavus

?How big was Acristavus?

Scientists have not published a full size estimate yet, but as a hadrosaur it was probably around 8 to 9 metres (26 to 30 ft) long, about as long as a school bus.3 5

?Did Acristavus have a crest?

No. Acristavus is special because it had no crest or ornamentation on its skull, unlike most other duck-billed dinosaurs.3 4

?What did Acristavus eat?

Acristavus was a plant-eater (herbivore). It ate ferns, leaves and other plants that grew in its wet, seasonal habitat.5 3

?When did Acristavus live?

Acristavus lived about 79 to 81 million years ago, during the Campanian stage of the Late Cretaceous.3 5

Ku bazobereye muri dinozore

Izina rya siyansi: Acristavus
Yiswe na: Gates et al. 20115
Itsinda: Iminwa y'imbata
Umuryango / ishami: Hadrosauridae5
Ishyirwa mu byiciro: Ornithischia > Ornithopoda > Iguanodontia > Hadrosauridae5
Imyaka y'amabuye: imyaka miliyoni 84 kugeza 72 (Campanian)5
Inzego z'amabuye: Two Medicine, Wahweap5
Ibihugu: Amerika5
Ibisigazwa byanditswe: 2 muri The Paleobiology Database5
Ivumburwa: Acristavus was named by Terry A. Gates, Jack Horner, and colleagues in 2011. The first fossils were found in Montana and Utah.1
Biracyagibwaho impaka: Scientists are not sure why Acristavus lacked a head crest while many other duck-billed dinosaurs had one.1

Aho amakuru yakuwe

PBDB Taxon (paleobiodb.org)
Acristavus Gates et al. 2011 - Encyclopedia of Life (eol.org)
Acristavus (Wikipedia) (Wikipedia)
Acristavus: North America’s New Hadrosaur (smithsonianmag.com)
Acristavus in The Paleobiology Database (CC BY 4.0): imyaka, ahantu, inzego z'amabuye, ishyirwa mu byiciro.

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