Nautiloid Posted July 23, 2020 Share Posted July 23, 2020 I found this last Saturday in Brookfield, Madison County, New York. It’s pretty beat up but there are some features that can still be made out. I was wondering if it might be a bellacartwrightia rather than a greenops, which was my original thought. According to Karl A. Wilson’s Field Guide to the Devonian Fossils of New York, one way to tell the difference is the number of lenses in the eye in a vertical row. For greenops there is maximum of 6. This trilobite has 7 in some places. A picture of the eye, showing a vertical row of 7 lenses. A top view of the trilobite A side view A view of the pygidium Thanks for looking Link to comment Share on other sites More sharing options...
piranha Posted July 23, 2020 Share Posted July 23, 2020 Bellacartwrightia has a range up to 8-10 lenes per dorsoventral file. Greenops has a maximum of 6. Lieberman, B.S., Kloc, G.J. 1997 Evolutionary and Biogeographic Patterns in the Asteropyginae (Trilobita, Devonian) Delo, 1935. American Museum of Natural History Bulletin, 232:1-127 PDF LINK Link to comment Share on other sites More sharing options...
Nautiloid Posted July 23, 2020 Author Share Posted July 23, 2020 @piranhaAlright, thanks! So does that mean it’s a bellacartwrightia? Link to comment Share on other sites More sharing options...
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