Flattened animals represent animals, and flattened animals represent five species

The representative animals of flattened animals are:1. The representative animals of flattened animals include pork tapeworm, parasites, schistosomiasis, planarians, discoid flukes, marine planarians, etc., among which all the schistosomiasis are parasitic, most of them are parasitic in the camp, a few are parasitic outside the camp, and the androgenic schistosoma is parasitic in the venous vessels of mammals in a hugging state.

2. Streptozoa, also known as pork tapeworm, pig tapeworm and hookworm, is the main human parasitic tapeworm in China. In ancient medicine, the larvae are milky white, flat and long like a belt, slightly pu, slightly transparent, about 2 4m long, the front part is thinner, the back part is gradually flattened, and the width is wide.

3. Schistosomiasis is also known as schizoid fluke; Platyzoa, flukes, recolonizers, schizozodae. There are three species of Schistosoma japonicum (Schistosoma japonicum), Schistosoma haematii, and Schistosoma mansoni in humans, as well as the portal system that parasitizes humans and animals, which can cause schistosomiasis.

The five species of flattened animals are planarians, pork tapeworms, hosts, parasites, and schistosomiasis.

1. Planarians: It is the most primitive group of flattened animals, the body surface is ciliated, the intestine is more developed, the body of planarians is symmetrical on both sides, also known as left and right symmetry, and there is only one section of the longitudinal axis of the body to divide the body into two symmetrical parts.

2. Pork tapeworms: invertebrates, tapeworms, bands. The body length is shorter than that of beef tapeworms, usually 2 3 m, 7 8 mm wide, with a total of 800 900 proglottids, and the mature proglottids at the posterior end are about 10 mm long.

3. Host: also known as host, refers to parasitic organisms, including parasites, viruses and other organisms that provide a living environment. Parasites obtain nutrients by living in or on the surface of the host.

4. Parasites: pathogenic lower eukaryotic organisms that live in a parasitic manner. Any organism that is in or attached to a host to obtain the nutrients or shelter necessary for its survival, development, or reproduction.

5. Schistosomiasis: dioecious schistosomes, parasitic in the veins and vessels of mammals in a hugging state. There are seven developmental stages in the life history process: adults, eggs, caterpillars, maternal larvae, daughter larvae, cercariae and larvae.

The main characteristics of flattened animals are that they live in moist places such as freshwater and oceans, have two light-sensitive pigment spots (eyespots) at the front of the body, and have cilia on the body surface partially or completely.

Phylum Platyzoa.

Begin to have a well-developed mesoderm and appear bilaterally symmetrical; With muscle tissue, the receptors are also improved, and the functions of feeding, digestion, and excretion are also strengthened. Mesenchymal tissue formed by the mesoderm.

Also known as parenchymal tissue, it fills the body between various organs and can transport nutrients and excrete waste; Histiocytes also have the ability to regenerate new organ systems.

Flattened animals include:

Flattened animals are: pork tapeworms, parasites.

Host, schistosomiasis.

Planarians. Coelenterata.

of animals, usually hydroids.

type and jellyfish type. There are many species, which are generally divided into 4 classes: hydra, bowl jellyfish, polyps, and ctenophores. Including various hydroids, jellyfish, jellyfish, sea cucumbers, corals, and more.

Invertebrates in the Ordovician.

, the number is dominant. There are straight oblong, aurora hornstones, pine roll types, ring trumpet horn stones, and Eurasian hornstones. Not only are there many types of straight lengths, but the shells are huge.

The above content reference: Encyclopedia - Flat Animals Phylum.