Their body bears minute pores called ‘ostia’ through which water enters the spongocoel (body cavity). Water leaves the body through a large opening called ‘osculum’. Beating of flagella creates water current.
Phylum Porifera (Pori = Pores: feron = bearing): Members of the phylum Porifera are also called sponges.
Characteristic features of the phylum:
1. Habitat: They are aquatic, mostly marine but few species...
