Protognathus

Il num vul dir: “early jaw lizard”1

Mangiava: PlantasCuliezs lungsGiurassic mesaun fin Giurassic tardiv

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

Viveva

avant 171 fin 155 milliuns onns3

Giurassic mesaun fin Giurassic tardiv

Spertadad maximala

var 15 km/h (9 mph)

Currer, stima

Cura viveva el?

Triassic

Giurassic

Cretacic

avant 252 milliuns onns20114566, l'asteroid

Quant spert era el?

Ina persuna che va a pe var 5 km/h (3 mph)

In uffant sin il velo var 12 km/h (7 mph)

Protognathus var 15 km/h (9 mph)

In chaval che galoppescha var 65 km/h (40 mph)

In gepard var 100 km/h (62 mph)

chaussas cool

Fatgs divertents

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

Maletg da Protognathus fatg cun IA — In maletg fatg cun IA che mussa co Protognathus pudess avair guardà ora, fatg d'in computer tenor quai che la scienza sa. I sa tracta d'ina supposiziun: l'animal vair ha forsa guardà ora auter, e sias colurs vairas èn nunenconuschentas.

Chatschader da mitus

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

Vardad: 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

Per experts da dinos

Num scientific: Protognathus
Numnà da: Zhang 19883
Gruppa: Culiezs lungs
Famiglia / clada: Cetiosauridae3
Classificaziun: Sauropodomorpha > Sauropoda3
Vegliadetgna da la crappa: 171 fin 155 milliuns onns (Bajocian / Oxfordian)3
Chats da fossils: 1 en The Paleobiology Database3
Scuverta: 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
Anc discutà: Scientists debate whether Protognathosaurus is a valid genus or just a nomen dubium, because the only fossil is a piece of jaw.1

Danunder che vegnan ils fatgs

Protognathosaurus (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Protognathus in The Paleobiology Database (CC BY 4.0): vegliadetgna, lieus, formaziuns da crap, classificaziun.

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