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What are the characteristics of phylum-porifera?

General features of phylum Porifera:

  • They are mostly marine and non-motile.

  • They are mostly found attached to rocks.

  • They show cellular level of organization. Their body is not organized into tissues and organs.

  • Their bodies are porous. Their body has holes or pores all over, which allows the circulation of water throughout the body and bring in food and oxygen.

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1.THIER SKELETON IS MADE UP OF SPICULES FIBRE  2..THESE ARE ASYMMETRICAL.3.PHYLUM PORIFERA ALSO KNOWN AS SPONGES.

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 1. exclusively marine , mostly aquatic.

2. cellular level of organisation

3.adults are sessile and young ones are free swimming.

4.water enters into the large body cavity through ostia and comes out through osculum. This is known as water canal system

5.Water canal system helps in food gathering, respiratory gases and removal of waste.

6.body is made up of spicules.

7.primitive and multicellular.

8. nutrition: holozoic and digestion:intracellular.

9.fertilization:internal and development: indirect

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porifera means pore bearing body

they are equatic

they are mostly sessile(fix with susstatem)

example-sponge

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They are multicellular and diploblastic Body with many pores called Ostia,canals or chambers through which water flows called canal system Large aperture called osculumn at upper end Body encloses a large cavity spongocoel Reproduction asexual by budding Examples. Sycon , sponge
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cellular level of organisation , mostly marine and few are fresh water like euspongia ,mostly assymetrical,body is covered by spicules acts as exoskeleton .
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General Characteristics of Porifera
Poriferans are commonly called sponges.
These are multicellular organisms which are sessile/sedentary in nature.
Most of them are marine while a few are fresh water forms.
Body is cylindrical, asymmetrical or has radial symmetry.
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