Protognathus

Igama lithetha: “early jaw lizard”1

Yayitya: IzityaloIintamo-ndeiJurassic ephakathi ukuya ku-iJurassic yamva

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

Yaphila

171 ukuya ku-155 izigidi zeminyaka eyadlulayo3

iJurassic ephakathi ukuya ku-iJurassic yamva

Esona santya siphezulu

malunga ne-15 km/h (9 mph)

Ukubaleka, uqikelelo

Yaphila nini?

iTriassic

iJurassic

iCretaceous

Izigidi ezingama-252 zeminyaka eyadlulayo20114566, i-asteroyidi

Yayikhawuleza kangakanani?

Umntu ohambayo malunga ne-5 km/h (3 mph)

Umntwana ekhwele ibhayisikile malunga ne-12 km/h (7 mph)

Protognathus malunga ne-15 km/h (9 mph)

Ihashe elibaleka ngamandla malunga ne-65 km/h (40 mph)

Ingwenkala malunga ne-100 km/h (62 mph)

izinto ezimnandi

Iinyani ezimnandi

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

Umfanekiso owenziwe yi-AI: Protognathus — Umfanekiso owenziwe yi-AI obonisa indlela Protognathus esenokuba wayekhangeleka ngayo, wenziwe yikhompyutha ngokwento eyaziwa zizazinzulu. Kukuqikelela nje: esona silwanyana sinokuba sasikhangeleka ngenye indlela, kwaye akukho mntu waziyo imibala yaso yokwenyani.

Inyaniso ngeentsomi

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

Inyaniso: 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

Kwiingcali zeedayinaso

Igama lenzululwazi: Protognathus
Inikwe igama ngu:: Zhang 19883
Iqela: Iintamo-nde
Usapho / iclade: Cetiosauridae3
Ukuhlelwa: Sauropodomorpha > Sauropoda3
Ubudala bamatye: 171 ukuya ku-155 izigidi zeminyaka (Bajocian / Oxfordian)3
Iirekhodi zeefosili: 1 kwi-Paleobiology Database3
Ukufunyanwa: 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
Kusaxoxwa ngayo: Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1

Apho iinyani zivela khona

Protognathosaurus (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Protognathus in The Paleobiology Database (CC BY 4.0): ubudala, iindawo, izakhiwo zamatye, ukuhlelwa.

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