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Phylum Porifera
Sponges lacking true tissues, gut, body cavity, and segmentation, with choanocytes aiding in filter feeding.
Phylum Cnidaria
Radially symmetrical organisms with diploblastic structure, nematocysts for defense, and indirect development with planula larva stage.
Phylum Platyhelminthes
Flatworms with bilateral symmetry, triploblastic structure, protostome development, and remarkable regeneration abilities.
Phylum Rotifera
Bilaterally symmetrical rotifers with pseudocoelomate structure, corona for feeding, and both sexual and asexual reproduction.
Phylum Annelida
Bilaterally symmetrical annelids with coelomate structure, prominent segmentation, and setae on segments.
Phylum Mollusca
Bilaterally symmetrical molluscs with mantle for shell secretion, radula for feeding, and cephalization.
Class Gastropoda
Molluscs with torsion during development, coelomate structure, and both direct and indirect development.
Class Bivalvia
Molluscs with two-part shell, coelomate structure, and filter feeding behavior.
Class Cephalopoda
Molluscs with highly developed nervous system, complex behaviors, and significant cephalization.
Phylum Nematoda
Roundworms with pseudocoelomate structure, eutely, cuticle, and longitudinal muscles.
Phylum Arthropoda
Bilaterally symmetrical arthropods with exoskeleton, jointed appendages, and segmentation.
Class Polyplacophora
Molluscs with eight-plated shell, coelomate structure, and direct development.
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