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Carl, I don't know about these taxa, however, the Mollusca class of Monoplacophora was known as a fossil group prior to living monoplacophorans being found. I believe the gastropod genus Pleurotomaria was known from the fossil record before living ones were found. Regards, Charlie ................................................. Research Associate - Section of Mollusks Carnegie Museum of Natural History Pittsburgh, PA, USA Assistant Professor - Family Medicine
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