Marine animals are divided into 2 main categories: vertebrates and invertebrates. Vertebrates have backbones, invertebrates do not.
Oceanologists distinguish the main classes of marine animals, known as types:
All vertebrates are chordates, including: whales, sharks and dolphins, amphibians, reptiles and fish. Although there are millions of chordates in the seas, there are not as many vertebrates as there are invertebrates.
There are 17 main groups of invertebrates that live in the sea, for example: crustaceans, hemichordates and others.
Shark Chinese striped
Mustachioed dog shark
Other marine animals
Bahamian sawnose shark
Humpback whale (Humpback)
Seiwal (Saidyanoy (ivas) whale)
pygmy sperm whale
Rare marine animals reptiles. While most reptiles live on land or spend time in fresh water, there are species that live in the oceans. The most famous of them are sea turtles. They live for many years, grow large. In the ocean, adult turtles have no enemies and dive deep to find food or avoid danger. Sea snakes are another type of reptile that lives in salt water.
Marine animals are an important food source for humans. People get food at sea individually and on large sea vessels, seafood is tasty, healthy and cheaper than the meat of warm-blooded animals.