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Arthropods

> Chelicerates | Crustaceans | Trilobites | Insects | Other Arthropods

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(112 total)

Trilobite fossil with reconstruction
Trilobite fossil with reconstruction
© 2003 Otto S. Zapecza

Diacalymene clavicula
Diacalymene clavicula
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum

Modocia weeksensis
Modocia weeksensis
© 2005 The Virtual Fossil Museum

What are Arthropods? Arthropods, meaning “jointed foot,” get their name because they have a segmented, jointed external skeleton made primarily of chitin, which is often further stiffened with calcium carbonate. As arthropods grow, they must break apart and remove this old skeleton and form a new one by molting. Different arthropod groups have appendages that have been modified for different purposes, such as sensory functions, respiration, feeding, and locomotion. Arthropods include the most numerous and diverse group of animals today, the insects, as well as shrimp, spiders, millipedes, and barnacles. Also included are many extinct forms, like trilobites and eurypterids.

First known fossil occurrence: Cambrian.

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

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