What are the types of marine life, and how many species are there?

There are a total of 210 species of creatures under the sea. There are currently 210,000 known species of marine life, and the actual number is estimated to be more than 10 times that number, or 2.1 million species.

A total of 20,278 species of marine organisms have been recorded in the waters under the jurisdiction of China, and the marine organisms belong to 5 biological kingdoms and 44 biological phyla, of which the animal kingdom has the most species, with 12,794 species, and the prokaryotic kingdom has the least, with 229 species.

Scientists around the world are currently engaged in an unprecedented collaborative programme to identify and compile inventories of all marine life. How many species of life are there in the ocean?

A survey that synthesizes global ocean data has been released. There are currently 15,304 registered species of marine fish, and it is estimated that there will be about 20,000 species of marine fish in the end. There are currently 210,000 known species of marine life, and the actual number is expected to be more than 10 times that number, or 2.1 million species.

There are organisms almost everywhere in the ocean, but different environments, the species composition and structure of biological communities, as well as the number of various groups, individual size, morphology, physiological and biochemical characteristics, etc., are very different. The pattern of marine biological distribution is interacting with the marine environment and evolving in harmony. Marine organisms are generally divided into three categories: plankton, swimming organisms and benthic organisms according to their lifestyles.

1. Plankton.

No or weak swimming ability, suspended in water and moving with the current, including bacteria, phytoplankton (such as diatoms, dinoflagellates, etc.) and zooplankton (such as jellyfish, pteropods of gastropod molluscs, heteropods, larvae of many marine animals, etc.).

2. Swimming creatures.

Refers to those animals that have well-developed locomotor organs and strong swimming ability. Including fish, mammals (e.g., whales, dolphins, seals), reptiles (e.g., sea snakes, turtles), molluscs (e.g., squid, octopus), and some large shrimp (e.g., prawns, lobsters), etc., their swimming ability, speed and mode also vary greatly.

3. Benthic organisms.

A variety of organisms that live on the bottom of marine waters and cannot swim in the water for long periods of time, including benthic plants (almost all seed plants such as macroalgae and mangroves), benthic animals (benthic species, sponges, coelenters, links, linears, soft, crustaceans, echinoderms, vertebrates and other phyla).

So far, more than 1.7 million species have been identified by humans. Among them, there are 4,200 species of mammals, 8,700 species of birds, 5,100 species of reptiles, 3,100 species of amphibians, 21,000 species of fish, and more than 1.3 million species of invertebrates. In terms of plants, there are 250,000 species of higher vascular plants and about 150,000 species of lower plants. In fact, the actual number of species is much higher than the above figures.

Because some regions, especially the tropics, are rich in species, people have a very incomplete grasp of them. Therefore, some studies estimate that the total number of species in the world is roughly 500

Between 10 million species. However, in recent years, some scientists have studied the classification of insects in tropical forests, and estimated that there may be more than 30 million species of organisms on the earth.

According to the size of the individual, plankton can be divided into six categories: giant plankton, larger than 1 cm, such as jellyfish; plankton macros, 5 10 mm, e.g. copepods, krill; medium-sized plankton, 1 5 mm, e.g. small jellyfish, copepods; Small plankton, 50 μm 1 mm, e.g. diatoms, cyanobacteria; microplankton, 5 50 μm, such as dinoflagellates, golden algae; Ultra-microplankton, less than 5 microns, such as bacteria.

1. Dolphin: an aquatic mammal with a spindle-shaped body. 2. Sperm whale:

The head is huge, with a body length of up to 18 meters. 3. Starfish: It is in the shape of a five-star and has a bright color.

4. Sea rabbits: There are a pair of antennae similar to rabbit ears, the shape is small and cute, and the color is mostly white. 5. Flounder:

The body is flat and has a pointed head.

1. Dolphins

Dolphins are the fastest moving mammals in the water, have a well-developed sonar system, and dolphins are good at jumping and diving, with nostrils on the head, which makes it easy for dolphins to jump out of the water to breathe, dolphins are small to medium size cetaceans, their body length is to meters, and their weight is 30-14,000 kg.

2. Sperm whale:

Sperm whale is a large marine animal, its head is huge, weighing more than 50 tons, and the head of the sperm whale accounts for one-third of the body, mainly feeding on squid, sperm whale is a social creature, widely distributed in the world's non-frozen seas, will carry out north-south migration every year, swimming speed can reach more than ten nautical miles per hour.

3. Starfish

Starfish is a representative species of echinoderms, its body is flattened, the shape is similar to a five-pointed star, and the starfish is active when the mouth is facing downward, the back is upward, its bones are connected by connective tissue, the body can be bent, widely distributed in the sandy seabed and coral reefs, and there are about 1,600 species of starfish.

4. Sea rabbits

The sea nudibranch, also known as the sea slug, is a shallow sea shellfish, with two pairs of antennae similar to rabbit ears on the head, its shell has degenerated into an inner shell, and there is a thin layer of shell skin on the back, the color is white, and the sea hair is a hermaphroditic creature, and there is an egg sperm groove between the two reproductive pores of the male and female.

5. Flounder:

Flounder, also known as flounder, is a fish that grows on the bottom of the sea, its body shape is flattened, asymmetrical, two eyes are distributed on the same side of the head, the eyeless side has no pigment, and adult flounder will permanently lie on one side of the seabed.