Evolution by Monroe W. Strickberger

Jones & Bartlett Publishers

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	Chapter 14 - From Protozoa to Metazoa Haikouella lanceol: An Early Chordate. The first chordates to be found are in Cambrian sediments. Haikouella lanceol was recently described in China as one of the earliest found chordates. Chien, Huang, and Li, paleontologists associated with discovery describe the fossil and its signifcance. Read the article on Haikouella lanceol. Consider teh illustartions and photos of the fossil. Does it seem easy to describe and to interpret such a fossil? What significance do they authors attach to their find? Visit the Early Cambrian Chordate web site. (The site will open externally in a new window) Read other descriptions and see sketches of animals from the Burgess Shale sediments. Visit the The Burgess Shale Creatures web site. (The site will open externally in a new window) Metazoans, multicellular animals, may have arisen from single-celled organisms similar to choanoflagellates. Sponges may be the oldest relic group of metazoans living today. Read an American Scientist article summarizing these views. Visit the The Emergence of Animal Body Plans web site. (The site will open externally in a new window)