Science Fair Project Encyclopedia
Echiura
The Echiura, or spoon worms, are a small group of marine animals. They are considered a group of annelids, though they lack the segmented structure found in other members of that group, and are often treated as a separate phylum. The Echiura fossilize poorly and the earliest known specimen is from the Pennsylvanian (called the upper Carboniferous outside North America). However, U-shaped fossil burrows that could be Echiuran have been found, dating back to the Cambrian.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details