What are the protozoa? What are the flattened animals?

Protozoa: are paramecium, flattened dinoflagellates, etc.

Coelenterates: corals, jellyfish, anemones, etc.

Molluscs: thieves, octopuses, nautilus.

Wait. Arthropods: centipedes, shrimps, crabs, spiders, and various insect annelids.

Annelids: Earthworms.

Ascaris parasitizing the human body.

and pinworms and other nematoids: common such as earthworms, gastric worms, white worms, fairy insects, roundworms, water silk worms and other nematomorphic animals hookworms.

Representatives of protozoa are paramecium, flattened animals: flagellates, coelenterates: corals.

Molluscs: shellfish are still octopuses and other arthropods: shrimp crabs, insects.

Annelids: earthworms Nematoids: roundworms, pork tapeworms, etc.

Protozoa are the heaviest type of eukaryotic unicellular animals in the animal kingdom, and the individual is composed of a single cell.

Protozoa generally reproduce in a way that alternates between sexual and asexual generations. Paramecium and amoeba are both protozoa.

Flattened animals are the beginning of bilaterally symmetrical (the body is divided into two symmetrical parts by only one plane through the central axis of the body), and the trigerm. The symmetrical body shape on both sides makes the animal's body divided into front and back, left and right, and dorsal and ventral; The emergence of the mesoderm has further complexed, perfected and developed the structure and function of the animal body, reaching the level of organ system, laying the foundation for the evolution of animals from aquatic to terrestrial, and the primitive excretory system and trapezoidal nervous system have also appeared in the flat animal stage. During development, there is a Mueller's larval stage.

Pork tapeworms, schistosomiasis, planarians, parasites, etc., are all flattened animals.

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 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.