Okay camperoos, its time to have a look at another mystery fossil. The last one turned out to be a fish fin known as Listracanthus (rest of the fish is unknown). This one is from the world famous Burgess shale and represents some of the best soft tissue preservation of early Cambrian metazoans in the world. This one was originally described as just a worm, but the structure in the middle suggests a notochord, and the bars around it suggest myomeres, which would make this thing a Pikiea (one of our earliest ancestors). But then again, that 'notochord' could just be the gut, and the 'myomeres' could just be segments of the worm.
Thursday, August 18, 2005
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