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Mollusca
Bivalves (hinged shells), Gastropods (snails), Cephalopods (coiled or straight shells with internal chambers)
Arthropoda
exoskeletons divided into segments, jointed appendages. Key fossil group is Trilobites
Echinodermata
show five-fold symmetry. Includes sea urchins, starfish, crinoids
Brachiopoda
similar to bivalves, with symmetry between the two shells rather than across
Cnidaria
corals (solitary and colonial) that form calcareous skeletons
Bryoza
small, moss-like colonial organisms
Porifera
sea sponges, asymmetrical, solitary, pores, spicules
Hemichordata
graptolites, colonial, asymmetrical