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In most places in the world, the first organisms found as fossils are trilobites. These creatures, at first appearance were exceedingly complex members of Phylum Arthropoda, to which modern insects and crustaceans belong. They had compound eyes, antennae, fully articulated appendages, gills, and all of the complexity of modern members of that phylum.

______________________________________________________ Ó 2010 Arthur V. Chadwick, Ph.D.