Non-chordates with important features

Porifera: Pores, water canal system, choanocytes; Cnidaria: Cnidoblasts, tissue level, alternation of generation (metagenesis); Ctenophora: Comb plates (locomotion), bioluminescence; Platyhelminthes: Flatworms, acoelomate, flame cells (osmoregulation); Aschelminthes: Roundworms, pseudocoelomate; Annelida: Metamerism (true segmentation), nephridia; Arthropoda: Jointed appendages, chitinous exoskeleton, open circulation; Mollusca: Mantle, radula (feeding), unsegmented body; Echinodermata: Water vascular system, radial symmetry (adults), spiny skin; Hemichordata: Worm-like, stomochord, proboscis gland.