Perimeter

Perimeter 

Animals in this part of the animal kingdom are commonly known as sponges. These are usually marine and asymmetrical animals. These are primitive multicellular animals.

( : Porifera ) whose common name is  Sponge  ( : Sponge )

Is a kind of multicellular animal. The word Porifera is a combination of these two words. In 1836, the scientist Grant named the first circumference episode.

Features

• The multicellular body lacks specific tissues, tissues, organs and organ systems.
• Mainly unequal body, i.e. the body cannot be divided equally in any aspect.
• The ducts of the body are present which is a unique feature of this episode.
• Inside the body is a wide cavity called spongocytes covered by quinocyte cells which is exposed on the outside through a large pore called the occiput.
• The body wall has numerous small pores called ostia, which are formed by cells called porocytes.
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• Mature animals are immobile, meaning they are permanently stuck in an infrastructure.
• The body does not have pores or anus.
• They live alone or in colonies.
• All are aquatic animals, most of which are marine and some species are freshwater
• These are asilomatous or silomless animals