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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)

Cyathocrinites multibrachiatus
Cyathocrinites multibrachiatus
© 2004 Indiana State Museum, Indiana Geological Survey, and Indiana University

Monotis
Monotis
© 2003 Roland Gangloff, University of Alaska Museum

Turritella apicalis
Turritella apicalis
© 1997 Tom Maier

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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