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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)

Emeraldella
Emeraldella
© 2002 The Virtual Fossil Museum

Ichneumonidae
Ichneumonidae
© 1998 UCMP

Odontocephalus aegeria
Odontocephalus aegeria
© 2000 West Virginia Geological and Economic Survey

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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