OCTAGON
Tetrapods
around 2009 June 19
The group of fishes most closely related to ancestral amphibians are the lobe-finned fishes, which include the coelacanths and lungfishes. These fishes share certain characteristics with amphibians, such as limbs with digits and lungs or lung-like structures, indicating a close evolutionary relationship.
All four-limbed animals belong to the clade of Tetrapoda. The clade of Tetrapoda is defined as the first basal four-limbed animals and all their descendants, extant and extinct. The clade immediately superior (ancestral) to that is the clade of Teleostomi, which contains all jawed vertebrates, including the tetrapods, bony fish, and the extinct lineage of acanthodian fish.
The word "tetrapod" literally translates as "four legs." Most tetrapods have four limbs, not counting the tail. There are some exceptions, snakes being the most obvious.
The evolution of limbs with digits was the most significant innovation that helped tetrapods move onto dry terrestrial environments. This adaptation allowed for weight support, better mobility, and the ability to navigate various terrains.
They are tetrapods.
Yes, tetrapods are believed to be direct descendants of fish. Around 360 million years ago, some fish evolved to have limbs and eventually transitioned onto land, giving rise to tetrapods.
Lions are not extinct yet.
is it that there are signs that by 2100, most species will be extinct.
Most become extinct because they can not adapt to changes in their environments. Those that can don't become extinct.
Tetrapods