When did thecodont live?

-It is thought that birds evolved from thecodont reptiles during the Jurassic Period some 150 to 160 million years ago. Thecodont reptiles were one of the dominant groups during the Triassic Period (195-230 mya).

1. Why is thecodont no longer used?
2. When did archosaurs start?
3. Is a thecodont a dinosaur?
4. Where did the archosaurs live?
5. When did thecodont go extinct?
6. Do humans have thecodont teeth?
7. Did archosaurs evolve dinosaurs?
8. Did pterosaurs have teeth?
9. What did the Phytosaur evolve from?
10. Where was the thecodont found?
11. Are Therapsids reptiles?
12. When did Therapsids go extinct?
13. Does Ankylosaurus have Antorbital Fenestra?
14. What did Diapsid reptiles evolve from?
15. Are birds and crocodiles related?

Why is thecodont no longer used?

Because the cladistic paradigm only recognises monophyletic taxa as natural groups, and because Thecodonts are a paraphyletic group (i.e. they include among their descendants animals that are not thecodonts), the term is no longer used by most paleontologists, although it can still be found in older (and even fairly ...

When did archosaurs start?

The first known archosaurs appeared in the Middle Triassic Period (about 246 million to 229 million years ago). They evolved from an earlier group of diapsid reptiles, diapsids having two openings in the skull behind the eye.

Is a thecodont a dinosaur?

thecodontian, archaic term formerly applied to any member of a group of primitive archosaurs (“ruling reptiles”) thought to include the ancestral stock of all other archosaurs, including birds, dinosaurs, pterosaurs (extinct flying reptiles), and crocodiles. The name thecodont means “socket-toothed.”

Where did the archosaurs live?

Instead, archosaurs and other archosauriforms quickly became the dominant land vertebrates in the early Triassic. Fossils from before the mass extinction have only been found around the Equator, but after the event fossils can be found all over the world.

When did thecodont go extinct?

They most likely went extinct from an asteroid during the Late Triassic Period some 200 million years ago, and that was probably the most important reason as to how the dinosaurs came to rule the Earth.

Do humans have thecodont teeth?

Answer: Humans and other mammals, including geckos, vertebrates, and reptiles are all classified as thecodonts and diphyodonts. Thecodont dentition is a dentition in which the base of the tooth is enclosed in jaw sockets.

Did archosaurs evolve dinosaurs?

Dinosaurs evolved from other reptiles (socket-toothed archosaurs) during the Triassic period, over 230 million years ago. Dinosaurs evolved soon after the Permian extinction, which was the biggest mass extinction that ever occured on Earth.

Did pterosaurs have teeth?

The pterosaur had a massive wingspan of about 4.9 feet (1.5 meters) — about as wide as a 10-year-old child is tall — and sported a total of 110 teeth, four of them inch-long (2.5 centimeters) fangs, said study researcher Brooks Britt, an associate professor of geology at Brigham Young University in Utah.

What did the Phytosaur evolve from?

Some recent studies of the evolutionary relationships of early archosauriforms suggest that phytosaurs evolved before the split between crocodile- and bird-line archosaurs and are the sister taxon of Archosauria.

Where was the thecodont found?

-In 1861 the fossilized remains of what was thought to be the skeleton of a thecodont reptile were discovered in a limestone quarry in southern Germany. The fossil was dated at approximately 150-160 million years old (Jurassic period, 136-195 mya).

Are Therapsids reptiles?

therapsid, any member of a major order (Therapsida) of reptiles of Permian and Triassic time (from 299 million to 200 million years ago). Therapsids were the stock that gave rise to mammals. ... Therapsids first appear in the Permian Period, during which they flourished and evolved into a number of mammal forms.

When did Therapsids go extinct?

The last of the non-mammalian therapsids, the haramiyidan cynodonts, became extinct in the Late Cretaceous, approximately 66 million years ago, though they may have become extinct later if Gondwanatheria are haramiyidans, as has been suggested.

Does Ankylosaurus have Antorbital Fenestra?

In the Ankylosauria, the antorbital and supratemporal fenestra have fused shut, and the lateral temporal fenestra is covered over in one family (Ankylosauridae). ... The characteristic cropping beak of the Ankylosauria is not developed in Scelidosaurus, suggesting that it was a selective feeder.

What did Diapsid reptiles evolve from?

Late in the period, the diapsid reptiles split into two main lineages, the archosaurs (ancestors of crocodiles and dinosaurs) and the lepidosaurs (predecessors of modern tuataras, lizards, and snakes). Both groups remained lizard-like and relatively small and inconspicuous during the Permian.

Are birds and crocodiles related?

Crocodiles are the closest living relatives of the birds, sharing a common ancestor that lived around 240 million years ago and also gave rise to the dinosaurs.