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Diapsid amniote
- A reptile is a diapsid amniote. (See the 'Rise and Fall and Rise') of Reptiles' section, above, to find out what this means.) All reptiles are descendants of those small, lizard-like animals that branched off from the ancestors of mammals around 312 million years ago.
Diapsids ("two arches") are a clade of sauropsids, distinguished from more primitive eureptiles by the presence of two holes, known as temporal fenestrae, in each side of their skulls. The earliest traditionally identified diapsids, the araeoscelidians, appeared about three hundred million years ago during the late Carboniferous period. [1]
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Synapsida [a] is one of the two major clades of vertebrate animals in the group Amniota, the other being the Sauropsida (which includes reptiles and birds). The synapsids were the dominant land animals in the late Paleozoic and early Mesozoic, but the only group that survived into the Cenozoic are mammals. [7]
Synapsids include all mammals, including extinct mammalian species. Synapsids also include therapsids, which were mammal-like reptiles from which mammals evolved. Sauropsids include reptiles and birds, and can be further divided into anapsids and diapsids. The key differences between the synapsids, anapsids, and diapsids are the structures of ...
Most diapsids show unique characteristics like strong jaw muscles and long radial bone. They were originally classified under the class Reptilia. Synapsid. They include mammals and mammal-like animals with one skull hole on each side. Their temporal fenestrae are fused. Synapsids were the largest vertebrates during the Permian period.
- It is a skull opening behind the eye cavity (orbit) in some vertebrates. It was a common feature in the fossilised skulls of most dinosaurs. Their...
- Sauropsids are lizard-like amniotes that are considered as a sister group to the synapsids. They were once the largest animals on water, air and la...
- Amniotes with no skull openings are termed anapsids. They are primitive organisms that had Permian turtles, terrapins and tortoises. Explore: Repti...
The key differences between the synapsids, anapsids, and diapsids are the structures of the skull and the number of temporal fenestrae behind each eye (Figure 29.21). Temporal fenestrae are post-orbital openings in the skull that allow muscles to expand and lengthen.
Synapsids include all mammals, including extinct mammalian species. Synapsids also include therapsids, which were mammal-like reptiles from which mammals evolved. Sauropsids include reptiles and birds, and can be further divided into anapsids and diapsids.
The early amniotes quickly diverged into two main lines: synapsids and sauropsids. Synapsids included the therapsids, a clade from which mammals evolved. Sauropsids were further divided into anapsids and diapsids. Diapsids gave rise to the reptiles, including the dinosaurs and birds.
