Plathyhelminthes - ANS-Dorsoventrally flattened, unsegmented acoelomates;
gastrovascular cavity or no digestive tract
Rotifera (rotifers) - ANS-Pseudocoelomates with alimentary canal (digestive tube with
mouth and anus); jaws (trophi) in pharynx; head with ciliated crown
Mollusca (clams, snails, squids) - ANS-Coielomates with three main body parts
(muscular foot, visceral mass, mantle); coelom reduced; most have hard shell made of
calcium carbonate
Annelida (segmented worms) - ANS-Coelomates with segmented body wall and internal
organs (except digestive tract, which is unsegmented)
Nematoda (roundworms) - ANS-Cylindrical, unsegmented pseudocoelomates with
tapered ends; no circulator system; undergo ecdysis
Arthopoda (crustaceans, insects, spiders) - ANS-Coelomates with segmented body,
jointed appendages, and exoskeleton made of protein and chitin
Echinodermata (sea stars, sea urchins) - ANS-Coelomates with bilaterally symmetrical
larvae and five-part body organiziation as adults; unique water vascular system;
endoskeleton
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