the trouble with marking is that I get distracted... this one is for Dan K.
Trilobites are the most diverse group of extinct animals preserved in the fossil record. Nine orders of trilobites are recognized, into which 15,000+ species are placed. Trilobites appeared some 600 million years ago during the Cambrian period, long before the fish inhabited the seas and the Dinosaurs roamed the land. They belonged the phylum Anthropodal (joint-footed), a phylum which to this day represents the most successful (78%) of all animal life forms, including crabs, centipedes, spiders, shrimps and insects. The Trilobites, living in shallow seas, flourished as swimmers, crawlers and burrowers for some 350 million years. more info here
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