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What is a Reptilian ancestors of mammals that had features of both reptiles and mammals?
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∙ 14y ago
Mammal-like reptiles that lived in the Permian, like cynodonts or therapsids.
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∙ 14y ago
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The pre dinosaur ancestors of the mammals therapsids combined features of mammals and what other kind of creatures?
Reptiles
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.
Are zebras reptiles?
No. Zebras are mammals. Now there is a reptilian critter that is called a zebra-tailed lizard, but it is not a zebra.
Is a star fish a reptilian?
No, starfish are not reptiles. Reptiles are vertebrates; that is, they have backbones. Fin-fish, amphibians, reptiles, birds, and mammals are vertebrates. Starfish aren't. Starfish are invertebrates called echinoderms.
Is the leatherback sea turtle a mammal?
they are endangered and no they are not mammals they are reptiles
What features do repitiles have to classify as a animal?
reptiles are animals so all of their features classify. reptiles are not mammals though if that what is being asked.
What are the main features of the animal kingdom?
mammals amphibians and reptiles birds
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.
Are human beings related to reptiles?
Ultimately all organisms are related. Humans are mammals, which are not closely related to reptiles. Mammals and reptiles belong to a group of animals called amniotes, which they also share with birds. Amniotes include all land vertebrates except amphibians. The last common ancestor of mammals and reptiles lived over 300 million years ago in the Carboniferous period. Shortly after the first amniotes branched off from amphibians they split into synapsids, which became the ancestors of mammals, and sauropsids, which became the ancestors of birds and all modern reptiles.
Which order of mammals lays eggs like their reptilian ancestors?
Monotremes lay eggs. Monotremes include just the platypus and the echidna. However, it is a fallacy to suggest that their ancestors were reptilian. This is pure theory, and not backed up by any evidence. Fossil evidence shows, for example, that the platypus is largely unchanged compared to its ancient, larger ancestor.
How do paleontologists distinguish between fossils of mammals and reptiles?
There are a variety of features but one is the number of fenestrae in the skull. Mammals also have more differentiated teeth than reptiles. Furthermore, you can look at the gait. Mammals have a parasagittal stance, while most reptiles have a sprawled stance.
Do monotremes provide evidence for the evolution of mammals from ancient reptiles?
Yes. Their retention of certain reptilian traits suggests that they are an early offshoot of the branch that stemmed from those ancestral reptiles and from which modern mammals eventually evolved. Such intermediary forms are exactly what we'd expect to find if this sort of thing had been going on.
