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Kaadi ya dayinoso No. 0019 ku 2 027

Acristavus

Erinnya litegeeza: “crestless grandfather”1

Yalyanga: EbimeraEz'emimwa gy'embaataEnkomerero ya Kuretasi

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

Yabeerawo

emyaka obukadde 84 okutuuka ku 72 emabega5

Enkomerero ya Kuretasi

Ebisigalira byazuulibwa mu

Montana and Utah, USA5

Obuwanvu

8 okutuuka ku 9 m (26 okutuuka ku 30 ft)1

Obuzito

ttani 2 okutuuka ku ttani 3 (4,400 okutuuka ku 6,600 lb)1

Obugulumivu

2.5 okutuuka ku 3 m (8.2 okutuuka ku 9.8 ft)1

Sipiidi esinga

nga 26 km/h (16 mph)

Okudduka, kuteebereza

Yabeerawo ddi?

Tiriyasi

Jurasiki

Kuretasi

Emyaka obukadde 252 emabega20114566, asteroyidi

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obuzito ng'obw'emmotoka 2

obuwanvu ng'emmotoka 2 ezisimbiddwa mu lunyiririobuwanvu ng'amenvu 50 nga gaddiriŋŋanaobuzito ng'obw'embwa 150obuzito ng'obwa wotamerooni 600obuzito ng'obw'ebibiina 4 ebijjuvu eby'abaana b'essomeroobuzito ng'obwa ddubu enjeru 7yandidduse mita 100 mu sikonda 14 (omuntu asinga embiro yeetaaga 9.6)

Acristavus yali munene atya bw'ogeraageranya ku GGWE?

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Omuntu atambula nga 5 km/h (3 mph)

Omwana ku kagaali nga 12 km/h (7 mph)

Acristavus nga 26 km/h (16 mph)

Embalaasi edduka ennyo nga 65 km/h (40 mph)

Cheetah nga 100 km/h (62 mph)

ebintu ebinyuvu

Ebyewuunyisa

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

Ekifaananyi kya Acristavus ekyakolebwa AI, nga kiraga engeri gye yayinza okuba ng'afaanana, ekyakolebwa kompyuta okusinziira ku ebyo bannassaayansi bye bamanyi. Kuteebereza: ekisolo ekyennyini kiyinza okuba nga kyali kifaanana bulala, era tewali amanyi langi zaakyo ez'amazima.

wabuuza

Ebibuuzo ebisinga okubuuzibwa ku 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

Eri abakugu mu dayinoso

Erinnya lya ssaayansi: Acristavus
Yatuumibwa: Gates et al. 20115
Ekibinja: Ez'emimwa gy'embaata
Ekika / ekibinja: Hadrosauridae5
Engabanya: Ornithischia > Ornithopoda > Iguanodontia > Hadrosauridae5
Emyaka gy'enjazi: emyaka obukadde 84 okutuuka ku 72 (Campanian)5
Ensengeka z'enjazi: Two Medicine, Wahweap5
Ensi: Amerika5
Ebisigalira ebyazuulibwa: 2 mu The Paleobiology Database5
Okuzuulibwa: Acristavus was named by Terry A. Gates, Jack Horner, and colleagues in 2011. The first fossils were found in Montana and Utah.1
Kikyakubaganyizibwako ebirowoozo: Scientists are not sure why Acristavus lacked a head crest while many other duck-billed dinosaurs had one.1

Ebituufu gye biva

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): emyaka, ebifo, ensengeka z'enjazi, engabanya.

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