JulianoLPD Posted July 9, 2019 Share Posted July 9, 2019 Hi there, guys. So, I recently bought a lot of trilobites from a Morrocan seller. I asked here in the forum for an ID and it turned out one of the trilobites came with wrong determination, so I'm adding pictures of the other specimens hoping you guys can help me get to genus at least. They were all sold as Phacops, but of course, the seller does not have knowledge enough to ID them, and neither do I (probably, even less, actually...). I'll add the pictures below for each specimen. First two pieces I believe it's Flexicalymene sp. Thanks in advance, Juliano Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 9, 2019 Author Share Posted July 9, 2019 Second Flexicalymene... Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 9, 2019 Author Share Posted July 9, 2019 No idea... Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 9, 2019 Author Share Posted July 9, 2019 No idea 2... Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 9, 2019 Author Share Posted July 9, 2019 Morocops sp.? Link to comment Share on other sites More sharing options...
Kane Posted July 9, 2019 Share Posted July 9, 2019 Hollardops mesocristata Gerastos sp. Reedops sp. — oops! Nope! 2 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 9, 2019 Author Share Posted July 9, 2019 17 minutes ago, Kane said: Hollardops mesocristata Gerastos sp. Reedops sp. Thank you, Kane! First two are Flexicalydeme, right? Link to comment Share on other sites More sharing options...
Kane Posted July 9, 2019 Share Posted July 9, 2019 You got it! I believe they are Flexicalymene ouzregui. 2 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 10, 2019 Author Share Posted July 10, 2019 By the way, @Kane, do you believe this other one is Morocops? How can I distiguish it from Reedops? Link to comment Share on other sites More sharing options...
Kane Posted July 10, 2019 Share Posted July 10, 2019 I generally associate Reedops with a more inflated, longer glabella. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
piranha Posted July 10, 2019 Share Posted July 10, 2019 42 minutes ago, JulianoLPD said: By the way, @Kane, do you believe this other one is Morocops? How can I distiguish it from Reedops? As mentioned previously in your other thread, the attached lens count diagrams clearly illustrate that it is not Reedops. McKellar, R.C. & Chatterton, B.D.E. 2009 Early and Middle Devonian Phacopidae (Trilobita) of Southern Morocco. Palaeontographica Canadiana, 28:1-110 4 Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 10, 2019 Author Share Posted July 10, 2019 3 minutes ago, piranha said: As mentioned previously in your other thread, the attached lens count diagrams clearly illustrate that it is not Reedops. McKellar, R.C. & Chatterton, B.D.E. 2009 Early and Middle Devonian Phacopidae (Trilobita) of Southern Morocco. Palaeontographica Canadiana, 28:1-110 Thank you, @piranha! Don't think I was doubting your ID. Just wanted to understand the difference between the two genera. The picture you attached is really informative! I'll take a look at this paper, I was looking for something like that! Thank you a lot. Link to comment Share on other sites More sharing options...
piranha Posted July 10, 2019 Share Posted July 10, 2019 1 minute ago, JulianoLPD said: Thank you, @piranha! Don't think I was doubting your ID. Just wanted to understand the difference between the two genera. The picture you attached is really informative! I'll take a look at this paper, I was looking for something like that! Thank you a lot. There are plenty of other venues for people to follow blindly without a hint of intellectual curiosity ... a healthy amount of doubt and skepticism are essential for good science! 2 Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 11, 2019 Author Share Posted July 11, 2019 6 minutes ago, piranha said: There are plenty of other venues for people to follow blindly without a hint of intellectual curiosity ... a healthy amount of doubt and skepticism are essential for good science! That's true! Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 11, 2019 Author Share Posted July 11, 2019 So, guys. Let me know if I got this right now. Would these little dudes be a Reedops, a Morocops and a Gerastos? Link to comment Share on other sites More sharing options...
piranha Posted July 11, 2019 Share Posted July 11, 2019 11 minutes ago, JulianoLPD said: So, guys. Let me know if I got this right now. Would these little dudes be a Reedops, a Morocops and a Gerastos? On this one please post images of the eyes with this orientation: 2 Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 12, 2019 Author Share Posted July 12, 2019 Put it under the microscope lens but the outcome didn't come out as I expected... =\ Link to comment Share on other sites More sharing options...
piranha Posted July 12, 2019 Share Posted July 12, 2019 You only show one eye. If you check both eyes, are there 8 lenses in any of the vertical lens files? Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 12, 2019 Author Share Posted July 12, 2019 2 hours ago, piranha said: You only show one eye. If you check both eyes, are there 8 lenses in any of the vertical lens files? The other eye is very poorly preserved. The most I could count is 7 lenses in one or two rows per eye only... Link to comment Share on other sites More sharing options...
piranha Posted July 12, 2019 Share Posted July 12, 2019 7 hours ago, JulianoLPD said: To view the ratio of the eye size to the cephalon, please post a photo that shows this exact angle: 1 Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 13, 2019 Author Share Posted July 13, 2019 Is this ok? Link to comment Share on other sites More sharing options...
piranha Posted July 13, 2019 Share Posted July 13, 2019 According to McKellar & Chatterton 2009, Reedops pembertoni has similar diagnostic features: "Visual surface bears 18 rows of lenses, with 7 (rarely 8) as maximum number of lenses per row, and 94–100 as typical total number of lenses per eye (see Text-fig. 10 for lens formula)." "Sculpture on glabella consists of very fine domed tubercles, bordering upon granule size. Distribution is sparse and widespread across dorsal surface, with progressive increase in density, crowding, prominence, and size range in anterior region..." 1 Link to comment Share on other sites More sharing options...
JulianoLPD Posted July 13, 2019 Author Share Posted July 13, 2019 Thank you a lot, @piranha!! That seems perfectly right. (Can't say I'm not a bit disapointed it isn't Morocops though...) Link to comment Share on other sites More sharing options...
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