KompsFossilsNMinerals Posted October 30, 2022 Share Posted October 30, 2022 (edited) Hi all, I found what I presume to be an Isotelus in the Trenton Group of NY yesterday. I posted the trilobite online and someone was saying that it is not an Isotelus based on how the trilobite looks Micropygous, and that they think it is a Proetid (even though the cephalon looks like an Isotelus’?) The trilobite I found looks to be in the Meraspis stage. Can anyone help clarify if this is an Isotelus, or what it could be if it isn’t? Here are some photos of the trilobite… Photo taken with my digital microscope Pygidium Face Isotelus life cycle I found on trilobites.info Edited October 30, 2022 by KompsFossilsNMinerals 2 Link to comment Share on other sites More sharing options...
minnbuckeye Posted October 30, 2022 Share Posted October 30, 2022 @piranha or @Kanewill know! The pygidium just doesn't match the Isotelus I find. Though I am frequently wrong!!! 1 Link to comment Share on other sites More sharing options...
KompsFossilsNMinerals Posted October 30, 2022 Author Share Posted October 30, 2022 8 minutes ago, minnbuckeye said: @piranha or @Kanewill know! The pygidium just doesn't match the Isotelus I find. Though I am frequently wrong!!! That’s the main thing kind of throwing me off! It’s all so confusing lol Link to comment Share on other sites More sharing options...
piranha Posted October 31, 2022 Share Posted October 31, 2022 The pygidium of Isotelus becomes isopygous as it reaches a mature holaspid state. figures from: Ludvigsen, R. 1979 The Ordovician Trilobite Pseudogygites Kobayashi in Eastern and Arctic North America. Royal Ontario Museum, Life Sciences Contributions, 120:1-41 PDF LINK Raymond, P.E. 1914 Notes on the Ontogeny of Isotelus gigas Dekay. Bulletin of the Museum of Comparative Zoology, 58(5):247-263 PDF LINK 5 1 1 Link to comment Share on other sites More sharing options...
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