What are the main groups of tetrapods?

tetrapes are monophyletic (descending from a common predecessor) of a group of land animals, which approximately 365 million years before the lobe called Sarkopterygians. It is assumed that tetrapods have evolved gradually from fish adapted to swimming through swamps with weeds. These fish developed muscular lower fins when they used these swamps to navigate, which eventually developed on full legs. Some of these early forms had numerous numbers, unlike five or fewer numbers common to so many tetraples today. There are only a few dozen species in this classification and all are long extinct.

In addition to basal tetraples, there are three main groups of tetraples: amphibians, synappers (which means a "fucking arch", mammals today the only synappers alive) and sauropsids (which means "lizard"). All these groups are monophyletic, with the exception of a possible exception of amphibians; Some scientists suspect that the sales may have developed from ancient amphibianA more primitive than the ordinary predecessors of all other living amphibians. Another name for Synapsids is Theropsid, which means "Beast Face" and another name for Sauropsids is "reptile".

both synappers and sauropsids are amnote, which means that fetal forms are brought up by a complex series of nutrients and membranes until they ripen enough to breathe air and go through the world independently. For synapsides it is a womb (placental mammal) or a housing (marsupial). Sauropsids lay eggs. It is assumed that synappers and sauropsids have evolved from amphibians at about the same time, about 320 million years ago, during the Carbon period. Hylonomus is the first confirmed reptile from this writing, while archaetis is the earliest synappers. They both resembled small lizards and were dwarves of large amphibians who at that time dominated ground ecosystems. Up to the icy at the end of KarSome of the large amphibians began to disappear, and synapers and sauropsids increased to fill free niches.