Body having meshwork of cells , internal cavities lined by food filtering flagellated cells , having pores in their body wall and the only phylum without nerve cells
Mollusa
Protozoa
Coelentrata
Porifera
Phylum porifera -
Most primitive multicellular organism having pores in their body walls.(Known as ostia).They are mostly marine, few freshwater.The only phylum without nerves cells.
- wherein
Spongilla,Sycon,Euspongia.