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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
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Odeeffannoowwan bashannansiisoo
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
Seenaa sobaa diigaa
Seenaa sobaa: Some people think Protognathosaurus is a fake or made-up dinosaur because it is so incomplete.
Dhugaa: 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
Ogeeyyii daayinootiif
- Maqaa saayinsii
- Protognathus
- Kan maqaa baase
- Zhang 19883
- Garee
- Morma-dheertota
- Maatii / kilaadii
- Cetiosauridae3
- Ramaddii
- Sauropodomorpha > Sauropoda3
- Umurii dhagaawwanii
- waggaa miliyoona 171 hanga 155 (Bajocian / Oxfordian)3
- Galmee fosilii
- 1 The Paleobiology Database keessa3
- Argannoo
- 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
- Ammallee falmisiisaa
- Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1
Odeeffannoon eessaa dhufa
- Protognathosaurus (en.wikipedia.org)
- PBDB Taxon (paleobiodb.org)
- Protognathus in The Paleobiology Database (CC BY 4.0): umurii, bakkeewwan, caasaawwan dhagaa, ramaddii.
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Brachiosaurus
Diplodocus
Brontosaurus
Argentinosaurus
Camarasaurus
Morosaurus
Ichthyosaurus
Khudiakovia
Ophthalmosaurus
Pterodactylus
Peloneustes
Rhamphocephalus