Kane Posted May 24, 2019 Share Posted May 24, 2019 Just cleaning up a few finds from the Hungry Hollow Member (Mid-Devonian, Arkona, Ontario). I am awful at discerning between proetids based on certain fragments, so was hoping for an assist as to whether it is a Pseudodechenella or Crassiproetus. If memory serves, one has a bigger anterior cephalic brim. I can usually tell them apart if I have the pygidium (Crassiproetus has a more rounded, effaced one). I’m leaning more toward Pseudodechenella. Once the genus can be nailed down, I have a question about size ranges that I haven't come across in the literature. When measured around the curve of the glabella, I get 2.5 cm. That seems fairly large for examples I've seen elsewhere. That would have made this trilobite, whole, about 7+ cm (sag.). That seems a bit too big for most proetids I've encountered. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
piranha Posted May 24, 2019 Share Posted May 24, 2019 When comparing maximum size range, a simple straight line measurement should be used instead of measuring around the curve. Link to comment Share on other sites More sharing options...
Kane Posted May 24, 2019 Author Share Posted May 24, 2019 1 minute ago, piranha said: When comparing maximum size range, a simple straight line measurement should be used instead of measuring around the curve. Brings it down to 2 cm. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
daves64 Posted May 24, 2019 Share Posted May 24, 2019 Is the red circled area part of an eye? Accomplishing the impossible means only that the boss will add it to your regular duties. Link to comment Share on other sites More sharing options...
Kane Posted May 24, 2019 Author Share Posted May 24, 2019 2 hours ago, daves64 said: Is the red circled area part of an eye? Unfortunately, just a bit of coral or bryozoan. The fragment pretty much ends before then. Hopefully I can get this figured out as it will help indexing these layers a bit better to guide my search for a complete one. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
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