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poriferans

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Rocío Mancilla Romero
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move nervous pores choanocytes water organs filter poriferans sessile atrium feeders both Skeleton marine osculum

Poriferans

Sponges , also known as , are the most primitive members of the animal kingdom . Their cells are not organised into well - defined tissues and have no .

Most sponges are animals which may form colonies or live as solitary organisms . Sponge are : They attach themselves to the ocean floor and can't around .

Poriferans bodies
Sponges lack symmetry and have an irregular shape .
Their bodies are full of ( which is where the group name comes from ) , through which can circulate . They have a central body cavity ( ) and an upper opening ( )
They have an internal that protects them . It can be composed of rigid spines called spicules , or of flexible fibres , called spongin .

Vital funtions of poriferans
Nutrition : Sponges are - . The movement of the flagella on creates a flow of water that circulates through the body .
Reproduction : Spores reproduce asexually and sexually . Asexual reproduction occurs through fragmentation or gemmation . In sexual reproduction they produce larvae which have the ability to swim .
Interaction : Poriferans have no system or sense organs .