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| Animals possessing a pseudocoel ("false cavity"); a fully functional body cavity; tissue for this cavity is derived from the mesoderm and only partly lines the cavity - thus, not as organized as a coelomate |
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| A characteristic feeding organ possessed by Brachiopoda, Bryozoa, and Phoronida; horseshoe-shaped crown of cilia |
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| The phyla which possess lophophores; Brachiopoda, Bryzoa, and Phoronida |
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| A specialized type of free-living larva found in lophotrochozoans |
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| A group of protostome animals including Arthropoda, Nematodoa and several smaller phyla |
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| A specialized, flagellated cell found in sponges; line the body interior |
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| Free-floating, often umbrella-shaped body form found in Cnidarian animals, such as jellyfish |
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| A typically sessile, cylindrical body form found in Cnidarian animals, such as Hydras |
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| A harpoon-like structure found in the cnidocytes of animals in the phylum Cnidaria; when released, stings and helps capture prey |
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| Specialized cells found in the network of tubules inside flatworms; assist in water regulation and some waste excretion |
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| Functions in both digestion and gas exchange; possessed by the phyla Cnidaria and Platyhelminthes |
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| In eumatazoan animals, the layer of digestive tissue that develops from the endoderm |
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