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Staminate Flower
Lacks carpels.
Carpellate Flower
Lacks stamens.
Neuter Flower
Lacks both reproductive structures.
Acoelomate
No body cavity.
Pseudocoelomate: body cavity partly lined by mesoderm.
Coelomate
Body cavity completely lined with mesoderm.
Asymmetry
No symmetry.
Radial Symmetry
Body arranged around a central axis.
Bilateral Symmetry
Left/right symmetry
Porifera
Choanocytes, amoebocytes, intracellular digestion, no true tissues.
Cnidaria
Cnidocytes, radial symmetry, polyp and medusa forms.
Ctenophora
Eight comb rows, diploblastic.
Platyhelminthes
Flatworms, acoelomate, many parasitic.
Nematoda
Roundworms, pseudocoelomate, complete digestive tract.
Rotifera
Wheel organ, pseudocoelomate.
Mollusca
Visceral mass, foot, mantle, coelomate.
Arthropoda
Jointed exoskeleton, segmented body.