:  Primitive Chordates
Body Form: The primitive chordates have pharyngeal gill slits - slots in the side of their neck region like those of a shark. They also have a notochord - the ancestor of the vertebral column in a vertebrate. They resemble sponges or eels, depending on the phylum.
Diet: The primitive chordates are generally filter feeders.
Natural History: The primitive chordates include the sea squirts, tunicates, and lancelets. Both are obscure marine animals that are related to the marine vertebrates. Sea squirts and tunicates both resemble sponges and filter feed for food. The lancelets look like primitive fish with gill slits and elongated fish-like bodies.

Examples at SeaScape Studio:
Blue Social Tunicate
Giant Pacific Tunicate
Red Sea Squirt