AkerCS Posted April 11, 2020 Share Posted April 11, 2020 Hi, I'm trying to classify this trilobite, could it be phacops speculator or morocops ovatus? what is the difference? Thanks. 1 Link to comment Share on other sites More sharing options...
Huntonia Posted April 12, 2020 Share Posted April 12, 2020 First, I have to say, that is a nice bug! If I'm not mistaken in order to get a species you need a lense count. Post a focused close up picture of one of the eyes and an expert can help tell you species. @piranha has some excellent resources for lense counts. 1 Link to comment Share on other sites More sharing options...
piranha Posted April 12, 2020 Share Posted April 12, 2020 Austerops speculator can be eliminated as the glabellar tubercles for that species are less conical and pitted. There are many phacopids in Morocco, as mentioned above, please post a photo that shows all the eye lenses. 2 Link to comment Share on other sites More sharing options...
AkerCS Posted April 12, 2020 Author Share Posted April 12, 2020 @piranha @Huntonia Thanks. I hope this photo is valid. Link to comment Share on other sites More sharing options...
piranha Posted April 12, 2020 Share Posted April 12, 2020 We need to see all the eye lenses. Please post additional photos that show the anterior and posterior lens files: 1 Link to comment Share on other sites More sharing options...
AkerCS Posted April 13, 2020 Author Share Posted April 13, 2020 @piranha I've counted 82 lenses, 19 files. Based on this document, I think it may be morocops (morocops granulops maybe?). https://www.researchgate.net/publication/312917851_The_phacopine_trilobite_genera_Morocops_Basse_2006_and_Adrisiops_gen_Nov_from_the_Devonian_of_Morocco Link to comment Share on other sites More sharing options...
piranha Posted April 13, 2020 Share Posted April 13, 2020 Here are the lens diagrams for M. granulops and M. ovatus. There is some variability in the frequency and number of lenses per file. The posted specimen has an additional lens in the posteriormost file, but the diagrams indicate similar low frequency rates in various other lens file positions. With the diagrams and specimen in hand, let us know which species is the best overall match. "These record the number of trilobites carrying a lens in each position shown in the diagram. Vertical columns represent files of lenses. Numbers in large font represent large lenses in that position in the eye, and numbers in small font represent number of diminutive lenses in that position. The pattern is generated by placing the top lens in the anteriormost file in the same position in every diagram (top left); the number in that circle represents the number of specimens counted to generate the diagram." Chatterton, B.D.E., Fortey, R.A., Brett, K.D., Gibb, S.L, McKellar, R.C. 2006 Trilobites from the Upper Lower to Middle Devonian Timrhanrhart Formation, Jbel Gara et Zguilma, Southern Morocco. Palaeontographica Canadiana, 25:1-177 PDF LINK McKellar, R.C., Chatterton, B.D.E. 2009 Early and Middle Devonian Phacopidae (Trilobita) of Southern Morocco. Palaeontographica Canadiana, 28:1-110 PDF LINK 3 Link to comment Share on other sites More sharing options...
AkerCS Posted April 13, 2020 Author Share Posted April 13, 2020 @piranha morocops ovatus is the best overall match Link to comment Share on other sites More sharing options...
piranha Posted April 14, 2020 Share Posted April 14, 2020 Thanks for the update! Here is the original description of Morocops ovatus (McKellar & Chatterton, 2009) McKellar, R.C., Chatterton, B.D.E. 2009. Early and Middle Devonian Phacopidae (Trilobita) of Southern Morocco. Palaeontographica Canadiana, 28:1-110 PDF LINK 1 Link to comment Share on other sites More sharing options...
AkerCS Posted April 16, 2020 Author Share Posted April 16, 2020 thank you very much @piranha Link to comment Share on other sites More sharing options...
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