aek Posted July 26, 2020 Share Posted July 26, 2020 Going through old stuff and found this. Measures 1cm.Platteville formation(?), WI. Any ideas? 2 Link to comment Share on other sites More sharing options...
Huntonia Posted July 26, 2020 Share Posted July 26, 2020 Dalmanitid of some sort. Dalmanites maybe? @piranha 1 Link to comment Share on other sites More sharing options...
aek Posted July 26, 2020 Author Share Posted July 26, 2020 Is it Sceptaspis lincolnensis? 2 Link to comment Share on other sites More sharing options...
Huntonia Posted July 26, 2020 Share Posted July 26, 2020 That looks like a good match, and I learned of a new trilo genus yay! We'll see what Scott has to say. 1 Link to comment Share on other sites More sharing options...
Kane Posted July 26, 2020 Share Posted July 26, 2020 Possibly closer to Calyptaulax plattevillensis, on account of Sceptaspis having a more inflated glabella at L1 and L2 where they are fused laterally...But I’ll need to double check my sources. 2 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
aek Posted July 26, 2020 Author Share Posted July 26, 2020 @Kane that is a good possibility too. The genal spines are also throwing me off. Link to comment Share on other sites More sharing options...
piranha Posted July 26, 2020 Share Posted July 26, 2020 The long genal spines look good for: Sceptaspis lincolnensis Ludvigsen, R., Chatterton, B.D.E. 1982. Ordovician Pterygometopidae (Trilobita) of North America. Canadian Journal of Earth Sciences, 19(11):2179-2206 PDF LINK 7 Link to comment Share on other sites More sharing options...
aek Posted July 26, 2020 Author Share Posted July 26, 2020 Thanks for your help! @piranha Link to comment Share on other sites More sharing options...
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