aek Posted January 5, 2020 Share Posted January 5, 2020 I think this could be Arctinurus occidentalis but not 100% sure...measures 20mm across. Any help appreciated. Sugar run @piranha Link to comment Share on other sites More sharing options...
Malcolmt Posted January 5, 2020 Share Posted January 5, 2020 Where was this found and what formation ???? Link to comment Share on other sites More sharing options...
aek Posted January 5, 2020 Author Share Posted January 5, 2020 Just now, Malcolmt said: Where was this found and what formation ???? Oops...Illinois Sugar run formation Link to comment Share on other sites More sharing options...
piranha Posted January 5, 2020 Share Posted January 5, 2020 Illaenidae 1 Link to comment Share on other sites More sharing options...
aek Posted January 5, 2020 Author Share Posted January 5, 2020 15 minutes ago, piranha said: Illaenidae Thank you! Link to comment Share on other sites More sharing options...
piranha Posted January 5, 2020 Share Posted January 5, 2020 Similar to Illaenoides triloba: reported from Sugar Run Weller, S. 1907 The Paleontology of the Niagaran Limestone in the Chicago Area: The Trilobita. Natural History Survey, Chicago Academy of Sciences, Bulletin, 4(2):163-281 LINK 3 Link to comment Share on other sites More sharing options...
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