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Porifera
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Cnidaria
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Box Jellyfish
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Platyhelminthes
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Terrestrial Flatworm Land Planarian
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Nematoda
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Mollusca
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Annelida
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Arthropoda Cambrian (600mya) – Carboniferous (345mya)
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Echinodermata
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Chordata
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Golden Toad of Costa Rica – EXTINCT since 1989
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