What are the underwater animals? What are the small animals on the bottom of the sea

The small animals on the bottom of the sea are: sand silkworms, Hawaii.

Seahorses, squid.

Sea butterflies, sea snails, airbag jellyfish, flying squid, lobsters, sea butterflies, starfish, conchs, sea urchins, basket snake tails, crabs, nudibranchs, seahorses, deep-sea sandworms, etc.

Other animals on the ocean floor.

Sharks are fish in the ocean that have lived for more than 500 million years. They have barely changed in nearly 100 million years.

The seahorse is a small marine animal with a length of about 5 to 30 cm. Seahorses are slow, but they can catch copepods that are agile and good at stealth.

Dolphin. It is widely found in the world's oceans, inland seas and near river estuaries, and some species also appear in inland rivers. Dolphins usually prefer to live in groups and prey on fish and squid.

The underwater animals include turtles, dolphins, sharks, etc. The ocean occupies a very large area on the surface of the earth, the ocean occupies 70% of the earth's area, and the ocean is also the place we want to explore the most, from the surface of the sea to the bottom of the sea, there are animals, and there may be animals that have not been discovered.

Distribution of benthic fauna.

Light Zone: From the surface of the sea to 200 meters underwater, light can penetrate this range, and animals such as seabirds, shells, jellyfish, etc.

Low light area: 200 meters to 1000 meters underwater, the sea water in this location is relatively cold, and the animals include zooplankton, shrimp, fish, etc.

Deep sea area: 1000 meters below the water, the sun basically does not shine on this position, it is pitch black, and few animals survive.

The fauna of the seabed is as follows:

1. Sharks: Sharks have existed on the earth as early as 300 million years before the appearance of dinosaurs, and it has been more than 500 million years since then, and sharks have hardly changed in the past 100 million years. The conventional wisdom is that shark shark fins are high in protein, but this is wrong.

Eggs have far more protein than shark fin. Sharks are at risk of extinction because of decades of mass hunting;

2. Jellyfish: The body shape of the jellyfish is like a transparent umbrella, and the diameter of the umbrella body is large and small, and the diameter of the umbrella body of the large jellyfish can reach 2 meters. The edge of the umbrella has a number of whisker-like tentacles, and the tentacles with a width of 20 to 30 meters can be long.

Jellyfish existed as early as 650 million years ago, and jellyfish appeared before the dinosaurs. There are more than 250 species of jellyfish in the world's waters, which are distributed in waters all over the world, and all of them live in the ocean; Absolute land.

3. Lobster: the common name of the species under the lobster family of the class Decapodae of the phylum Arthropodae. It is also known as prawns, dragon head shrimp, shrimp kui, sea shrimp, etc.

It has a thick cephalothorax, a hard shell, colorful colors, a short abdomen, a body length of generally between 20 and 40 centimeters, a weight of about kilograms, and some of them are chelae. The heaviest can reach more than 5 kilograms, also known as lobsters and gobies.

The marine animals are: sharks, whales, dolphins, jellyfish, manatees, etc., and their characteristics are as follows:

1. Sharks. Sharks have hard, muscular bodies that are spindle-shaped to varying degrees. The muzzle and nose parts vary depending on the species, from pointed to large and rounded. The tail (caudal fin) that rises vertically upwards is roughly crescent-shaped, and the upper part of the caudal fin is much larger than the lower part in most species.

2. Whales. Whales are large, some with large bodies, and the largest can reach a length of up to 30 meters. The whale is shaped like a fish and is in the shape of a shuttle.

The head is large, the eyes are small, and the ear shells are completely degenerated. The neck is not noticeable. The forelimbs are fin-shaped, and the hindlimbs are completely vestigial; Most species have fins on their dorsal backs; The tail is horizontally finned and is the main locomotor organ.

3. Dolphins. The dolphin is meters long and weighs 23,225 kilograms. Dolphins have a pointed mouth and about 100 thin teeth in the upper and lower jaws, and feed mainly on small fish, squid, shrimp, and crabs.

4. Jellyfish. Jellyfish do not have a spine, but they have a very large body, relying mainly on the buoyancy of the water to support their huge body. The body shape is like a transparent umbrella, and the diameter of the umbrella body can be large and small, and the diameter of the umbrella body of the large jellyfish can reach 2 meters.

5. Manatee. Due to their adaptation to life in the water, manatees specialize in cones on their forelimbs, but they still have vestigial hooves at the ends, which are closer to ungulates. The hind limbs gradually degenerate and disappear, and the tail is a round broadwhale.