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Chithunzi choseketsa cha Protognathus
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Protognathus

Dzina limatanthauza: “early jaw lizard”1
Ankadya: ZomeraMakosi ataliPakati pa Jurasiki mpaka Kumapeto kwa 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

Ankakhala
zaka 171 mpaka 155 miliyoni zapitazo3
Pakati pa Jurasiki mpaka Kumapeto kwa Jurasiki
Liwiro lalikulu kwambiri
pafupifupi 15 km/h (9 mph)
Kuthamanga, kuyerekeza

Ankakhala liti?

Triasiki
Jurasiki
Kretase
Zaka 252 miliyoni zapitazo20114566, asteroidi

Anali ndi liwiro lotani?

zinthu zosangalatsa

Mfundo zosangalatsa

1

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

2

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

3

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

4

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

5

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

6

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

Chopangidwa ndi AIChithunzi cha Protognathus chopangidwa ndi AI
Chithunzi cha momwe Protognathus mwina ankaonekera, chopangidwa ndi kompyuta kuchokera pa zomwe asayansi amadziwa. Ndi kungoyerekeza: nyama yeniyeniyo mwina inkaoneka mosiyana, ndipo palibe amene akudziwa mitundu yake yeniyeni.

Wothetsa nthano zabodza

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

Zoona: 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

Kwa akatswiri a madino

Dzina la sayansi
Protognathus
Anapatsidwa dzina ndi
Zhang 19883
Gulu
Makosi atali
Banja / kladi
Cetiosauridae3
Magawidwe a sayansi
Sauropodomorpha > Sauropoda3
Zaka za miyala
zaka 171 mpaka 155 miliyoni (Bajocian / Oxfordian)3
Zolemba za mafosili
1 mu The Paleobiology Database3
Kupezeka
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
Akukambiranabe
Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1

Kumene mfundo zimachokera

  1. Protognathosaurus (en.wikipedia.org)
  2. PBDB Taxon (paleobiodb.org)
  3. Protognathus in The Paleobiology Database (CC BY 4.0): zaka, malo, mapangidwe a miyala, magawidwe a sayansi.

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