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From Lab Activity 3
Phylum
A major taxonomic category in the animal kingdom, distinguished by structural and functional characteristics.
Acoelomate
Animals that lack a body cavity.
Coelomate
Animals that possess a true body cavity.
Phylum Porifera
A phylum characterized by asymmetrical bodies, thousands of pores, and a central cavity for filter feeding.
Phylum Cnidaria
A phylum with radially symmetrical bodies, diploblastic tissue organization, and specialized cells called cnidocytes.
Phylum Platyhelminthes
A phylum of triploblastic, acoelomate, bilaterally symmetrical animals, which may be free-living or parasitic.
Phylum Nematoda
A phylum of roundworms that are triploblastic, bilateral, unsegmented, and have a complete digestive tract.
Phylum Mollusca
A diverse phylum with a complete digestive tract, soft muscular foot, and a visceral hump, often protected by a shell.
Phylum Annelida
A phylum characterized by segmentation, metamerism, and the presence of chaetae in most members.
Phylum Arthropoda
The most diverse animal phylum, known for jointed appendages, chitinous exoskeletons, and segmentation without septa.
Phylum Echinodermata
A phylum of deuterostomic animals with radial symmetry, internal skeletons made of ossicles, and slow-moving adults.
Phylum Chordata
A phylum that includes vertebrates and invertebrates with a notochord, including tunicates and lancelets.
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