Porifera
Nota de aplicación
Phylum of primitive multicellular aquatic animals. There are approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of 29,000 feet or more. Early naturalists regarded the sponges as plants because of their frequent branching form and their lack of obvious movement. The animal nature of sponges was first described in 1755, and was confirmed in 1765 after observations rev…