Protognathus
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
Ал качан жашаган?
Ал канчалык ылдам болгон?
Кызыктуу фактылар
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

Мифти талкалоочу
Миф: Some people think Protognathosaurus is a fake or made-up dinosaur because it is so incomplete.
Чындык: 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
Динозавр эксперттери үчүн
- Илимий аты
- Protognathus
- Ат койгон
- Zhang 19883
- Топ
- Узун моюндар
- Үй-бүлө / клада
- Cetiosauridae3
- Классификация
- Sauropodomorpha > Sauropoda3
- Тоо тектеринин жашы
- 171 … 155 миллион жыл (Bajocian / Oxfordian)3
- Таш калдык табылгалары
- The Paleobiology Database боюнча 1 жазуу3
- Табылышы
- 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
- Дагы эле талаштуу
- Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1
Фактылар кайдан алынат
- Protognathosaurus (en.wikipedia.org)
- PBDB Taxon (paleobiodb.org)
- Protognathus in The Paleobiology Database (CC BY 4.0): жашы, жерлери, тоо тектеринин катмарлары, классификациясы.
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