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Comment by sheila chambers

I just received a fossil arthropod that was erroneously identified as a "trilobite" however no trilobite has sutures like this arthropod. Is there any way I can submit digital photographs of this specimen to see if anyone has any idea what it is? I have searched the web & my extensive fossil invertebrate book collection & cannot find anything resembling this specimen other than a large spider which it isn't as this is a marine deposit. This fossil is from an Ordovician marine sediments in Ontario Canada.