Protognathus

Izina risobanura: “early jaw lizard”1

Yaryaga: IbimeraIzifite amajosi maremareJurasike yo hagati kugeza Jurasike ya nyuma

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

Yabayeho

hashize imyaka miliyoni 171 kugeza 1553

Jurasike yo hagati kugeza Jurasike ya nyuma

Umuvuduko wo hejuru

nka 15 km/h (9 mph)

Kwiruka, igereranya

Yabayeho ryari?

Triyasike

Jurasike

Kiretase

Hashize miliyoni 252 z'imyaka20114566, asiteroyide

Yihutaga ite?

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

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

Protognathus nka 15 km/h (9 mph)

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

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

utuntu twiza cyane

Utuntu dushimishije

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

Ishusho ya Protognathus yakozwe na AI — Ishusho yakozwe na AI yerekana uko Protognathus 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.

Gusenya ibinyoma

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

Ukuri: 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

Ku bazobereye muri dinozore

Izina rya siyansi: Protognathus
Yiswe na: Zhang 19883
Itsinda: Izifite amajosi maremare
Umuryango / ishami: Cetiosauridae3
Ishyirwa mu byiciro: Sauropodomorpha > Sauropoda3
Imyaka y'amabuye: imyaka miliyoni 171 kugeza 155 (Bajocian / Oxfordian)3
Ibisigazwa byanditswe: 1 muri The Paleobiology Database3
Ivumburwa: 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
Biracyagibwaho impaka: Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1

Aho amakuru yakuwe

Protognathosaurus (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Protognathus in The Paleobiology Database (CC BY 4.0): imyaka, ahantu, inzego z'amabuye, ishyirwa mu byiciro.

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