Narrative

Sponges (Phylum Porifera) are a group of very primitive multicellular aquatic animals numbering about five thousand species. Sponges are such primitive animals that biologists originally believed they were plants. Most members of this family of invertebrates are marine species. The light, fibrous, flexible and absorbent skeleton of certain species have been popularly used for cleaning and bathing. Although some natural sponges are still marketed today, most used today are synthetically made. The four known classes of sponges are:

Class Calcarea: - A bristly surface
Class Demospongiae: - Common
Class Hexactinellida: - Glass
Class Sclerospongiae: - Coral-like

Taxonomy

References