Question

short notes on extinct reptiles

Answer 1

Reptiles were 1st vertebrates to make a complete transition to life on land (more food & space).

Arose from ancestral reptile group called cotylosaurs (small, lizard like reptile)

Cotylosaurs adapted to other environments in Permian period.

1. Pterosaurs – flying reptiles

2. Ichthyosaurs & plesiosaurs – marine reptiles

3. Thecodonts – small, land reptiles that walked on back legs

Mesozoic Era called "age of reptiles".

Dinosaurs dominated life on land for 160 million years

Brachiosaurs were largest dinosaurs

Herbivores included Brontosaurus & Diplodocus, while Tyrannosaurus were carnivores

Dinosaurs became extinct at end of Cretaceous period

Mass extinction of many animal species possibly due to impact of huge asteroid with earth; Asteroid Impact Theory

Amniote (shelled) egg allowed reptiles to live & reproduce on land

Answer 2

Answer:

A few words about extinct reptiles

Explanation:

• "Reptile" is a Latin word that means "one who crawls." Cold-blooded, with scaly skin and cleidoic eggs, all live reptiles are cold-blooded.
• Many major reptile groups, such as the mosasaurs, are now extinct. We used to think dinosaurs were extinct, but their feathery descendants prove otherwise (birds).
• Turtles, crocodiles, and the Tuatara, the lone member of its group, are among the ancient reptiles that have survived. Snakes and lizards make up the vast majority of today's reptiles.
• Herpetology is the study of living reptiles.
• Rather than a clade, Reptilia is an evolutionary grade. The primary reason for this is that the term "reptile" excludes birds, which are the descendants of theropod dinosaurs. Another reason is that the term "reptile" is deceptive because many extinct reptiles were nothing like current reptiles.
• As a result, many experts now use Class Sauropsida instead of Reptilia as a taxonomic class (which includes all reptiles and birds, living and extinct).

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