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Natural Science Forum / Biology / Paleontology / August 2004Idenitify this Trilobite Pydigium?
Ignoring the filename of the image below, I was wondering if anyone can help me identify the apparent trilobite tail. I found this fossil in northern Indiana in the mid-80's as a kid and I've had it in my collection since. Of course as a kid, I didn't take the time to record the exact location, but I believe it was near Wabash, Indiana. The rock its encased in is "dirty white" in that the white smooth rock has impurities that look like reddish brown sand embedded in it. http://members.wri.com/jeffb/Fossils/greenops1.jpg I thought it might be Greenops barberi, but I don't have any good sources that include this genus/species. I'm more familiar with the Cinncinnatian trilobites. Can anyone confirm this identity based on this one picture? Its 9.7 mm across. -Jeff Hi Jeff, Well... I saw your picture. It seems near Wabash, Indiana there are Silurian reefs. If you found it in these place i think that your Trilobite is not a Greenops barberi. His pygydium morphology is to differrent. We don't see the axis of it. Greenops always have a strong axis. Yours have not! Spines seems too small too. For Greenop, the middle spine must be alone. It seems there are a pair on your picture! Greenops are in the middle Devonian age (about between 392 and 370 My). Reefs near Wabash, Indiana are older than this (between 438 and 410 My : Silurian age). I think that is a Lichida (order) - Dameselloidea (superfamily) - Damesellidae (family) - ??? I dont know for the genus, you must ask to someone who have more knowledges! But for me, the number of pair of spines (6), pleural furrows very clear, a little pair of spines on posterior margin, a long terminal axial piece and above a thick axial ring looks like a Damesellidae! The size and also the stratigraphic age correspond to the age of reefs because Lichida have an Ordovician to Devonian occurence. But without an exact location it's hard to be sure. For me that it! I hope i can help you. Maybe see you later... Gilles PS: Sorry for my poor english! :o( Looks like a Devonian Boothii |
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