-
Matt Croxton commented on their own Fossil #006760 7 years, 9 months ago
7 years, 9 months ago7 years, 9 months agoI have provided an enlargement of the siphuncle. If you can provide a better ID by getting a good look at this structure, I’d appreciate the info!
I only know of one species of Orthonybyoceras – O. dyeri. In the same family is Treptoceras duseri. I’m not entirely sure how to best distinguish between them and I think they both can be found in the Grant Lake Fm. Any advice from other Ordovician folks? @jkallmeyer @kyle-hartshorn @bheimbrock
My apologies for not replying sooner. No reply for me means “I don’t know”. At times, these two were thought to be synonymous. I think that Treptoceras is more common and has a wider range. I’ll have to look dig into some siphuncle photos and see if I can tell the difference. Thanks for asking! @jbauer @matthew-croxton