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| | Cambrian Explosion |
 | | Furthermore, such traces must have been made by worms, some of which had lengths measured in centimetres, with through guts, which were capable of displacing sediment during some form of peristaltic locomotion, implying a system of body wall muscles antagonized by a hydrostatic skeleton. |
 | | Valentine, J.W.; Awramik, S.M.; Signor, P.W.; Sadler, P.M. The Biological Explosion at the Precambrian-Cambrian Boundary. |
 | | Valentine, James W.; Jablonski, David; Erwin, Douglas H. Fossils, Molecules and Embryos: New Perspectives on the Cambrian Explosion. |
| www.peripatus.gen.nz /paleontology/CamExp.html (3079 words) |
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