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Its a dinosaur

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The origin of turtles is still pretty much a mystery. The earliest turtles were aroud some 200 million years ago. Two theories are presented:

* Turtles are members of an ancient group of reptiles called Parareptilia. They are the only survivors of this group * The other theory is that the turtles evolved from an ancient group of animals called Diapsaida. Later offshoots of this group would become dinosaurs and their present day descendants like birds Mammals are thought to have diverted from the reptiles separately from dinosaurs some 300 million years ago in a group called theropsids.

In the above cases the mammals and turtle distant relatives were reptiles that existed more than 300 million years ago.

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14y ago
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13y ago

You need to specify a time period to get an accurate answer. The line of animals that eventually evolved into mammals has had many different forms over the years.

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13y ago

The amoeba at the beginning, but you need a time frame.

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8y ago

The amoebae.

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11y ago

Apes.

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Q: What are the ancestors of mammals?
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Related questions

The pre dinosaur ancestors of the mammals therapsids combined features of mammals and what other kind of creatures?

Reptiles


Are archeopteryx the ancestors of bats?

No mammals didn't decend from the dinosaurs, birds did. Bats came from common rodent ancestors.


What is a Reptilian ancestors of mammals that had features of both reptiles and mammals?

Mammal-like reptiles that lived in the Permian, like cynodonts or therapsids.


Which group of mammals lay eggs like their reptilian ancestors?

Mammals which lay eggs are called monotremes. They include the platypus, short-beaked echidna and long-beaked echidna. However, there is no evidence that reptiles were ancestors of the monotremes. Such a belief remains a theory, not fact.


What kind of vertebrate was likely evolutionary to mammals?

You need to specify a time period for the question to be answered. Synapsids, therapsids, and cynodonts could all be called the early ancestors of mammals, but each at a different stage in the evolutionary history of mammals.


What evidence about the ancestors of whales do fossils provide?

You can see that Whales have hipbones, because they use to be mammals, that walked on 4 legs.


What is a theraspid?

A therapsid is a group of animals consisting of mammals and their ancestors. They are notable for their complex jaws and evolved teeth and their upright posture.


What evidence do fossils provide about ancestors of whales?

You can see that Whales have hipbones, because they use to be mammals, that walked on 4 legs.


Did mammals evolve from a group of reptiles called raptors?

No. Mammals evolved from a group of reptiles called cynodonts. "Raptor" is an informal term for a group of dinosaurs call dromaeosaurids, which were closely related to the ancestors of birds.


What are thought to be the ancestor of armadillos?

Their direct ancestors are glyptodonts*, very much larger armadillos. Their more distant ancestors are thought to be general small mammals resembling shrews. Even further back their ancestry traces back through mammal-like reptiles and true reptiles, as do all mammals. *See image above of a glyptodont.


Why is there a much greater diversity of flying birds than there is of flying mammals?

Think of it as the same thing as land mammals versus water mammals. Marine mammals first evolved to life on land and then adapted to return to the water, but not all mammals did that. Similar thing with birds. All birds evolved from common flying ancestors, whereas flying mammals evolved from land mammals at a much later point in evolutionary history. Hope that helps.


What reptile group is thought to be the ancestors of mammals?

Synapsids were reptiles that had a hole in each temporal region, eventually giving rise to modern mammals.