Flavio Posted August 31, 2017 Share Posted August 31, 2017 Friends I have some Trilobites from the group Coronocephalus jastrowi and a Scutellum that I have some doubts and would like the help of the experts. I would like to know about the preparation of the fossil and its originality. Tks. Pics: Trilo 1 Trilo 2 The division of this trilobite occurred in the after death or the preparation that was not well done? Trilo 3 Trilo 4 Link to comment Share on other sites More sharing options...
Kane Posted August 31, 2017 Share Posted August 31, 2017 Beautiful fossil! I wouldn't think this is a scutellum given the pydigium. Any more into on location? I think @piranha will pinpoint this easily. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Flavio Posted August 31, 2017 Author Share Posted August 31, 2017 The seller says it is from the western Hunan province of China (central region). Link to comment Share on other sites More sharing options...
Douvilleiceras Posted August 31, 2017 Share Posted August 31, 2017 (edited) These all appear to be members of the genus Coronocephalus (Family Encrinuridae, Suborder Cheirurina, Order Phacopida), rather than a Scutellum (Family Styginae, Suborder Illaenina, Order Corynexochida), as the latter has a rounded pygidum, different pygidum ridges, and different shaped cephalon/glabella. Edited August 31, 2017 by Douvilleiceras Regards, Jason "Trilobites survived for a total of three hundred million years, almost the whole duration of the Palaeozoic era: who are we johnny-come-latelies to label them as either ‘primitive’ or ‘unsuccessful’? Men have so far survived half a per cent as long." - Richard Fortey, Trilobite: Eyewitness to Evolution. Link to comment Share on other sites More sharing options...
FossilDAWG Posted August 31, 2017 Share Posted August 31, 2017 I agree, all are Coronocephalus. the pygidium separated from the rest of the body prior to fossilization., It is not an artifact of the prep. Don Link to comment Share on other sites More sharing options...
piranha Posted August 31, 2017 Share Posted August 31, 2017 You have some nice examples of Coronocephalus from the middle Silurian of China. Attached are examples that show the complete trilobite. Although it is commonly labeled as C. jastrowi among the trilobite dealers, that name has never been formally assigned to any of the Coronocephalus species from China. The typical species that matches best is: Coronocephalus gaoluoensis. 2 Link to comment Share on other sites More sharing options...
Flavio Posted September 1, 2017 Author Share Posted September 1, 2017 You are right @piranha for your photos gave to identify better, what must always remain on the front after the fossilization is the rounded pygidum, demonstrated in the other fossils and with this making it difficult to identify that you kindly resolved. Thank you Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now