AFF

Chordata

Echinodermata

Arthropoda

Nematoda

Annelida

Mollusca

Lophophorates

Rotifera

Platyhelminthes

Cnidaria

Calcerea, Silicea

Lack true tissues; have choanocytes(collar cells - flagellated cells that ingest bacteria and tiny food particles

Unique stinging structures (cnidae), each housed in a specialized cell (cnidocyte); diploblastic; radially symmetrical; gastrovascular cavity (digestive compartment with a single opening)

Dorsoventrally flattened, unsegmented acoelomates; gastrovascular cavity or no digestive tract

Pseudocoelomates with alimentary canal (digestive tube with mouth and anus); jaws (trophi) in pharynx; head with ciliated crown

Coelomates with lophophores (feeding structures bearing ciliated tentacles)

Coelomates with three main body parts (muscular foot, visceral mass, mantle) ; coelom reduced; most have hard shell made of calcium carbonate

Coelomates with segmented body wall and internal organs (except digestive tract, which is unsegmented)

Cylindrical, unsegmented pseudocoelomates with tapered ends; no circulatory system; undergoes ecdysis

Coelomates with segmented body, jointed sppendages, and exoskeleton made of protein and chitin

Coelomates with bilaterally symmetrical larvae and five-part body organization as adults; uniquie water vascular systen; endoskeleton

Coelomates with notochord; dorsal, hollow nerve cord; pharyngeal slits; port-anal tail

Deuterostomia

Ecdysozoa

Lophotrochozoa

Bilateria

Eumetazoa

Metazoa