Movement. Adult sponges are basically sessile animals, but some marine and freshwater species are 1 to 4 mm (0.039 to) per day as a result of the movement of pinacosites and other cells such as amoeba. It can move across the ocean floor at a speed of 0.157 inches).
What kind of mobility does the sponge have?
Sperm carried by a stream of water fertilizes eggs from other sponges. Early larval development occurs within the sponge, and free-swimming larvae are then released through the oscram. This is the only time the sponge is mobile. The sponge is sessile like an adult and sticks to a fixed substrate for a lifetime.
Does the sponge have motility?
Mobility. Stemless animals usually have a motile phase of development. The sponge has a motile larval stage and becomes stemless when it matures.