Characteristics of porifera: →These have pores or holes all over the body. →These are non motile animals attached to some solid support. →These have pores which leads to a canal system that helps in circulating water throughout the body to bring in food and oxygen. →The body of porifera has design which involves very minimal differentiation and division into tissues. →These animals are covered with a hard outside layer or skeleton. →These are commonly called as sponges. →These are mainly found in marine habitat. →Examples:sycon, spongilla, etc. Hope this helps you
porifera :-
- sedentary 
- sessile
- appendages are absent
- cellular level of organisation
- exo- skeleton
- radial symmetry
- non-motile
- reproduction is asexual by budding . 
e.g.sycon , eupletilia