Sponguide, version April 1998. Queensland Museum, Australia. They have a cellular grade, which means they have no true tissues.
Adults are asymmetrical or radially symmetrical.
They are found from deepest oceans to the edge of the seam and from the coldest oceans to the tropics. Sponges play important roles in so many marine habitats but we still know very little about their diversity, biology and ecology as compared with most other animal groups. Sponges come in just about every color imaginable. Larvae are motile, incubated within the parent or broadcast into the seawater. Sponges filter sea water to eat, breath and excrete waste products.