What were the first tetrapods?

The first tetrapods probably evolved in the Emsian stage of the Early Devonian from Tetrapodomorph fish living in shallow water environments. The very earliest tetrapods would have been animals similar to Acanthostega, with legs and lungs as well as gills, but still primarily aquatic and unsuited to life on land.

What are four examples of tetrapods?

Although most tetrapods are terrestrial, there are numerous groups that have evolved to live in aquatic habitats. For example, whales, dolphins, seals, walrus, otters, sea snakes, sea turtles, frogs, and salamanders, are all examples of tetrapods that depend on aquatic habitats for some or all of their life cycle.

Which of the following are the first tetrapod vertebrates?

One of the earliest known tetrapods is from the genus Acanthostega. Its fossil indicates that it was aquatic and had gills similar to fishes. It had four limbs with the skeletal structure of limbs found in present-day tetrapods, including amphibians. Thus the correct answer is optionD.

What are the earliest vertebrates?

The earliest vertebrates were jawless fish, similar to living hagfish. They lived between 500 and 600 million years ago. They had a cranium but no vertebral column. The phylogenetic tree in Figure below gives an overview of vertebrate evolution.

Are lizards tetrapods?

Reptiles are tetrapod animals in the class Reptilia. This class includes today’s turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives.

What are tetrapods give two examples?

Tetrapods include all land-living vertebrates, such as frogs, turtles, hawks, and lions. The group also includes a number of animals that have returned to life in the water, such as sea turtles, sea snakes, whales and dolphins, seals and sea lions, and extinct groups such as plesiosaurs, ichthyosaurs, and mosasaurs.

Are lungfish tetrapods?

Both coelacanths and lungfishes share the category sarcopterygian with the tetrapods, which includes land animals like reptiles, amphibians, birds, and mammals, e.g. humans.

Is a frog a vertebrates?

Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts. All can breathe and absorb water through their very thin skin.