Dale Greenwalt Posted November 16, 2021 Share Posted November 16, 2021 Might anyone be able to put a genus (and species?) to this Mazon Creek specimen? The nodule itself is about 4" in length. It may be a polychaete—or not. Thanks! I appreciate your expertise. IMG_0178 copy.tiff 5 Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 16, 2021 Share Posted November 16, 2021 @Nimravis @stats @Mark Kmiecik @RCFossils @connorp Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted November 16, 2021 Share Posted November 16, 2021 Looks like Achistrum sp., it's a sea cucumber. 3 2 Link to comment Share on other sites More sharing options...
connorp Posted November 16, 2021 Share Posted November 16, 2021 25 minutes ago, Thomas.Dodson said: Looks like Achistrum sp., it's a sea cucumber. I agree. If you want to be 100% sure, look at the specimen under magnification. If preserved well enough, Achistrum will have diagnostic J-shaped sclerites. This can be a good way to differentiate between incomplete Achistrum and worms, especially Coprinoscolex which is also often preserved with desiccation cracks like this. 2 Link to comment Share on other sites More sharing options...
Nimravis Posted November 16, 2021 Share Posted November 16, 2021 Looks like a sea cucumber to me too. Link to comment Share on other sites More sharing options...
flipper559 Posted November 16, 2021 Share Posted November 16, 2021 Sea Cucumber, Nice one at that !! 1 Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted November 17, 2021 Share Posted November 17, 2021 (edited) I agree with Achistrum sp. sea cucumber. I think I can make out some of the plates forming the mouth. Observing the fish hook shaped sclerites using 10X or better magnification would confirm the ID. P.S. -- Get used to including a metric or imperial scale when submitting photos for ID. It is helpful in the majority of cases. Edited November 17, 2021 by Mark Kmiecik added postscript 1 Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
stats Posted November 17, 2021 Share Posted November 17, 2021 10 hours ago, Thomas.Dodson said: Looks like Achistrum sp., it's a sea cucumber. Agreed! Cheers, Rich 1 Link to comment Share on other sites More sharing options...
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