Animal species classification

Native Animal Door

Are single-celled animals, a handful of aggregation groups, free living in water or wet soil, part of the camp parasitic life, with asexual or sexual reproduction. There are no medicinal species, but in evolutionary primitive groups, and human life relations are very close, some parasitic species on human health and economic animal breeding, can cause great harm.

Sponge Animal Door

Also known as hole animal Door (Porifera), is living in the water the most primitive multicellular animal, although the cell has the differentiation, but does not constitute the organization. The cells can be arranged in 2 layers, but not divided into the inside and outside 2 germ layer, the body has the piping system, obtains the food from the water, also has the spicule to support and protects the body. such as brittle needle sponge Sp0ngiLLa Fragilis, can be used medicinally.

Coelenterate Door

There are about 10,000 kinds of coelenterate, there are several living in freshwater, but most live in the oceans. Coelenterate tentacles are very sensitive, above the group is known as barbed wire sac cells. Such animals mainly include jellyfish, Hydra, sea anemones, coral, etc.

Mollusk Door

Molluscs are the second largest group of animals, about more than more than 50,000 species. The vast majority of molluscs in the soft body of the outer covering 1, 2 or more shapes of different shells, common with the head of foot, abdominal foot and double-shell.

echinoderms Door

Echinoderms include starfish, sea urchins, sea cucumber, snake tail and sea Lily 5, a total of more than more than 6,000 species.

Platyhelminthes Door

Symmetrical, body differentiation into the outer, medium and inside three germ layer, that is, the beginning of the germ layer, the body soft and non-cavity, mostly bisexual, the excretion system has flame cells, free living in water, land, some species as parasitic.

Spething Door

The body is generally long-shaped or cylindrical, three germ layer has the original cavity, no section, the surface is a translucent elastic cutin membrane, the end of the digestive canal with anus, most of the dioecious, free living in seawater, freshwater and soil, and many are parasitic. such as the worm (Ascaris lumnbricoides).

Link Animal Doors

Body cylindrical, divide into the form of the link, the internal system differentiation tends to perfect, has the true body cavity, the body surface has the bristles or the wart foot, the dioecious or the homogeneous, the direct development or the metamorphosis, produces the bear wheel larva, most freely lives in the seawater, the freshwater and the soil, the few and can Chisheng such as earthworms (Pheretima aspergillum).

Arthropod Doors

Symmetrical on both sides of the body, with special-shaped sections such as head, chest, abdomen, and section of the attachment limb, the surface has a few chitin, stone composition of the outer skeleton, the body cavity is underdeveloped, muscle bundle, the circulatory system is open tube type, known about 923,000 species, for the first door in the animal kingdom. such as the centipede (Scolopendra subspinipes Mutilans).

Chordates Door

Having a spinal cord (or replaced by a section of the spine), dorsal nerve tube and gills (or for the gills), with the posterior mouth of the animal. Know about more than 41,200 thousand species, for the third door in the animal kingdom. The animal can be divided into tail rope animal sub Gate (Urochordata), the head of the animal sub Gate (Cephalochordata), vertebrate sub Doors (Vertebrata) and other 3 sub doors. Vertebrate sub-doors, many kinds, economic value, in the evolution is the highest type, nowadays many things scientists have become independent of it. such as the hippocampus (Hippocampus japonicus Kaup).

« 上一篇 下一篇 »