Sea lilies belong to echinodermata, sea lilies and marine invertebrates, and adults live on the seabed with stalks.
The handle has a spherical body and pinnate branches like tentacles (wrists) of fern leaves. The whole animal looks like a plant. The handle consists of a calcareous disc; The body has an endoskeleton, which is composed of closely arranged calcareous bone fragments.
Sea lilies mainly live in the deep sea and feed on organic debris. There are 80 kinds, all of which are less than 60 cm (24 inches) in length. From Japan to Australia, many species belong to Metacrinus. Albatrosses are common species in the West Indies.
2. Starfish
Starfish is the most representative echinoderm in structure and physiology. The body is flat, mostly symmetrical with five spokes, and the boundary between the body disk and the wrist is not obvious. Live with your mouth down and your mouth up.
There is a stepped groove on the ventral side of the wrist, and the tube foot extends out of the groove. The bone plate of endoskeleton is connected by connective tissue and flexible and elastic. There are spines and forked spines on the body surface, which are protrusions of bones.
Membranous vesicles protruding from between bone plates are covered with epithelium and lined with body cavity epithelium, and their inner cavities are connected with secondary body cavities, which are called dermgills, and have the functions of breathing and diffusing metabolites to the outside world. The water pipe system is developed. During ontogeny, there are larvae with feathers and short carpels.
There are 0/600 existing species/kloc-and 300 fossil species, which are widely distributed in sandy seabed, soft mud seabed, coral reefs and oceans of various depths.
3. sea cucumber
Sea cucumbers belong to invertebrates, echinoderms and sea cucumbers. There are more than 900 species in the world, and about 140 species in China. Among them, the Indian Ocean and the Western Pacific Ocean are the regions with the largest variety and resources of sea cucumbers in the world.
Sea cucumbers in China are distributed in temperate zone and tropical zone. The temperate zone is mainly located in Bo Huang sea area, and the main economic species is Stichopus japonicus, which is also the most famous sea cucumber species in China. The tropics are mainly in the coastal areas of Guangdong, Guangxi and Hainan, and the main economic variety is Japanese ginseng.
The most common animal in ten thousand meters deep ditch is sea cucumber. However, deep-sea sea cucumbers are inedible. Edible sea cucumbers mostly inhabit hard stone bottom, coral reef bottom or coral sand bottom. They can crawl slowly on the bottom of the sea, or lurk in the sand, or hide under stones. Sea cucumber has a "summer sleep" phenomenon, and sea cucumber with jade foot has a "hibernation" phenomenon.
Step 4: crabs
Crab is a crustacean of Decapoda, especially a species of brachypteridae (true crab). It also includes other types, for example, there are about 4700 kinds of curved-tailed clans. It is distributed in all oceans, rivers and land.
Crab's tail is different from other decapods (such as shrimp, lobster and crayfish). It curls under the chest and its carapace is usually very wide. The first pair of chest feet is specialized as pincers. Move usually by walking or crawling. ?
The lateral gait of common crabs is familiar to people and is also the characteristic of most crabs. Swimming crabs and other species have flat paddle appendages, and the tongs are dexterous and powerful. China is rich in crab resources, among which the hairy crabs produced in Taihu Lake, gaoyou lake and Yangcheng Lake in the lower reaches of the Yangtze River are top grade.
There are many kinds of crabs, most of which are edible. Most people who eat the most come from the sea or fresh water lakes.
5.octopus
Octopus: 252 species of marine mollusks belonging to 26 genera of Octopodidae. As the largest family of Cephalopoda, it can be divided into deep-sea Polypoda, Fine Foot, Fine Foot and Octapoda. The body is ovoid or ovoid, muscular, with narrow hair cavity opening and generally no water holes on the body surface.
This family is an important commercial cephalopod. Octopus from the south coast of China and octopus from the north coast have a certain yield. Dried octopus products are called "dried octopus" or "dried octopus", which are not only edible, but also have the functions of enriching blood and benefiting qi, astringing and promoting granulation in medicine.
As a temperate mollusk, living underwater, its adaptive water temperature should not be lower than 7℃, and the most suitable seawater proportion is 1.05438+0, and it will die in a low salinity environment. Can eat large animals and plankton and grow. Widely distributed in tropical and temperate waters of the world ocean.
6.squid
The real name of squid is mullet, also known as squid, cuttlefish or cuttlefish. It is a mollusk, belonging to cephalopods. When the squid meets a strong enemy, it will use "inkjet" as an escape way and wait for an opportunity to leave, so it has the names of "squid" and "cuttlefish".
There are pigment vesicles in the skin, which will change color and size with the change of "mood" Squid can jump out of the sea and have amazing air flight ability. Like squid and octopus, they all belong to marine mollusks, but not to fish.
References:
Baidu encyclopedia-sea cucumber
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Baidu encyclopedia-starfish
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Baidu encyclopedia-crab
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Baidu encyclopedia-octopus
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Baidu encyclopedia-squid
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Baidu encyclopedia-sea lily