See text. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Tunicate, also known as urochordata, tunicata (and by the common names of urochordates, sea squirts, and sea pork) is the Ascidiacea (commonly known as the ascidians or Sea squirts is a class in the Tunicata Subphylum of sac-like marine Filter feeders Enterogona is an order of Tunicates in the class Ascidiacea. It describes a group of marine animals