porifera

Phylum : Porifera


common name :sponges


habitat:found in marine and fresh water,found sessile( attached to rock or shells)



Cells: are not organised into tissues, but are specialised.


example: porocyte-for entry of water.Choanocyte :food is digested here or passed on to amoebocytes for digestion.food are microscopic organisms .Amoebocyte :mobile and move around the cell body.differentiate to form spicules and carry nutrients to other cells,carry oxygen and waste products.
(http://www.biology.ualberta.ca/courses.hp/zool250/animations/Porifera.swf)

water entry :water enter through pore cell and excreted though osculum.

Reproduction :asexual and sexual.sexual :mostly monoecious where sperm fuses with egg to form zygote.asexual : though gemmule , budding, regeneration.

uniqueness :it is separated in another subkingdom called parazoa because of its distictive characteristic from other animals..