ANIMALS ACUATIC

They are called marine animals to all those animals that live in the waters of the sea, all their life or at least much of it. We do not know, according to scientists, know them. Many marine species are among the extinct animals so there are many half of the animal species that inhabit the seabed, and as we go, we will never marine animals that we may not even know and we give you all the information below.

They should distinguish between animals that can take advantage of breathing oxygen dissolved in water and those who need to breathe oxygen from the air. Aquatic animals are distributed throughout the zoological scale, being almost exclusively aquatic those of lower groups (protozoa), as well as spongiaries, polyps and echinoderms, large number of worms, most mollusks and all brachiopods and tunicates. Of the arthropods that live in the water, there arealmost all crustaceans, rarely arachnids and aquatic insects, mosquitoes.

Among vertebrates, aquatic animals are also abundant, species living entirely in the water breathing through gills such as fish and all larval forms of amphibians, although the latter in their adult phases (with lung breathing) are sometimes aquatic The frog and the salamander and others, terrestrial like the frog.