Protognathus

Erinnya litegeeza: “early jaw lizard”1

Yalyanga: EbimeraEz'ensingo empanvuAmakkati ga Jurasiki okutuuka ku Enkomerero ya Jurasiki

Protognathosaurus was a big, long-necked plant eater that lived in China during the Middle Jurassic. It is known from just a piece of its lower jaw, so scientists are still figuring out exactly what it looked like.1

Yabeerawo

emyaka obukadde 171 okutuuka ku 155 emabega3

Amakkati ga Jurasiki okutuuka ku Enkomerero ya Jurasiki

Sipiidi esinga

nga 15 km/h (9 mph)

Okudduka, kuteebereza

Yabeerawo ddi?

Tiriyasi

Jurasiki

Kuretasi

Emyaka obukadde 252 emabega20114566, asteroyidi

Yali wa mbiro kwenkana wa?

Omuntu atambula nga 5 km/h (3 mph)

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

Protognathus nga 15 km/h (9 mph)

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

Cheetah nga 100 km/h (62 mph)

ebintu ebinyuvu

Ebyewuunyisa

Protognathosaurus is known only from a single piece of lower jaw, called a dentary, which had about 18 tooth positions.1

Its name was first Protognathus, but that name was already used for a beetle, so in 1991 it was changed to Protognathosaurus.1

The jaw shows sharp replacement teeth still growing in, which is why the species name oxyodon means 'sharp tooth'.1

It lived about 168 to 161 million years ago, during the Middle Jurassic.1

The fossil was found in the Lower Shaximiao Formation, which is made of sandstone and mudstone from an ancient lake.2

Scientists think it was a medium-sized primitive sauropod, with a thick and heavy lower jaw.2

Ekifaananyi kya Protognathus 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.

Omumenyi w'enfumo

Enfumo: Some people think Protognathosaurus is a fake or made-up dinosaur because it is so incomplete.

Amazima: It is a real dinosaur, but many scientists consider it a nomen dubium, meaning the name is doubtful because the fossil is too fragmentary to be sure.1

Eri abakugu mu dayinoso

Erinnya lya ssaayansi: Protognathus
Yatuumibwa: Zhang 19883
Ekibinja: Ez'ensingo empanvu
Ekika / ekibinja: Cetiosauridae3
Engabanya: Sauropodomorpha > Sauropoda3
Emyaka gy'enjazi: emyaka obukadde 171 okutuuka ku 155 (Bajocian / Oxfordian)3
Ebisigalira ebyazuulibwa: 1 mu The Paleobiology Database3
Okuzuulibwa: In 1988, Zhang Yihun named and described the type species Protognathus oxyodon from a jaw found in China. In 1991, George Olshevsky renamed it Protognathosaurus because the old name was already taken.1
Kikyakubaganyizibwako ebirowoozo: Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1

Ebituufu gye biva

Protognathosaurus (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Protognathus in The Paleobiology Database (CC BY 4.0): emyaka, ebifo, ensengeka z'enjazi, engabanya.

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