Exploring Invertebrate Life

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Invertebrata definition

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without a backbone or vertebral column

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Percentage of animal species that are invertebrates

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95%

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Main groups of invertebrates

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Cnidaria, Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda, Echinodermata

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Largest invertebrate phylum

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Arthropoda

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Examples of arthropods

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spiders, crustaceans

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Body symmetry in invertebrates

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or bilateral symmetry

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Porifera characteristics

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porous bodies; mostly marine sponges

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Cnidaria features

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cells, radial symmetry; jellyfish, corals

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Mollusca examples

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clams, octopuses

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Echinodermata characteristics

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skin, radial symmetry; starfish, sea urchins