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Invertebrates

> Ediacaran Organisms | Sponges | Cnidarians | Arthropods | Molluscs | Brachiopods | Bryozoans | Echinoderms | Hemichordates and Chordates | Other Invertebrates

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(426 total)

Texigryphea  mucronata
Texigryphea mucronata
© 1997 Tom Maier

Ecphora quadricostata
Ecphora quadricostata
© 2000 Harley Means

Valvata
Valvata
© 2000 Karl Wilson

What are Invertebrates? Invertebrates are multicellular animals without backbones. This very large group makes up 95% of living animal species, including such familiar organisms as insects, crabs, clams, and earthworms, as well as less familiar trilobites, brachiopods, and crinoids. Invertebrates dominate habitats as diverse as the deep sea, tide pools, coral reefs, rocks on stream bottoms, and soils. Although some invertebrates fossilize better than others, this group has a long fossil record, extending back to the Precambrian.

First known fossil occurrence: Precambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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