In this article we will discuss about the structure of spongilla with the help of a diagram.
1. It is a common freshwater colonial sponge found usually attached to sticks or pieces of wood in lakes and ponds.
2. Usually yellowish brown in colour and comprised of numerous small individuals with a common flat base.
3. Every individual is perforated with numerous ostia and also has one osculum for one individual or one osculum for more than one individual. In the later case two such individuals are said to represent each other’s branches.
4. Canal system is of rhagon type and skeleton is of spongin fibres with interspersed silicious monaxon spicules.