Other Invertebrates

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Archaeosycon
© 2003 Melissa Hicks, University of Nevada, Las Vegas

Tullimonstrum gregarium
© 2003 Gary Andrashko, Illinois State Museum

Receptaculites oweni
© 2003 Gary Andrashko, Illinois State Museum

What are Other Invertebrates? This group contains a wide variety of animals that have a long, but patchy, fossil record, including nematodes, flatworms, annelids, ctenophores, rotifers, and scolecodonts, among others. Also included here are organisms such as stromatoporoids, archaeocyaths, and receptaculitids that cannot be easily placed in any other invertebrate group. The archaeocyaths first appeared in the Cambrian and were extinct by the end of the period. The remaining taxa appeared later in the Phanerozoic, and some are still around today.

First known fossil occurrence: Cambrian.

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

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