mediterranic Posted June 16, 2017 Share Posted June 16, 2017 Four specimens presented for discussion. I studied several possibilities and, with a huge risk of error on this tricky ones, I present my hypotheses till now. By now just for the genera, of course. 1st and 2nd pics - Kingaspidoides sp. ? 3th and 4th pics - Kingaspidoides sp. ? 5th and 6th pics - Ornamentaspis sp. ? 7th and 8th pics - Latikingaspis sp. ? (a risky call and Geyer, 1990 don't help as all plates with this genus have just partial cranidia). I found just one photo browsing the web to compare (last attachment). Thanks in advance for your opinions. Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted June 16, 2017 Author Share Posted June 16, 2017 I think the right genal of the first specimen it is painted. My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted June 16, 2017 Share Posted June 16, 2017 6 hours ago, mediterranic said: I studied several possibilities and, with a huge risk of error on this tricky ones... Yes, the ellipsocephalids are very tricky. As you mentioned, much of the published literature with only cranidia for evaluation. Luckily, my colleague knows these trilobites quite well, and IDs all of them as: Kymataspis arenosa 5 Link to comment Share on other sites More sharing options...
mediterranic Posted June 17, 2017 Author Share Posted June 17, 2017 Well, @piranha, first of all, thank you very much for your time to my question. Second, I am really astonished with your answer for two reasons. One positive, one negative. The positive reason is that I've learned (and I am learning) a lot - with you, with the forum in general and about this question in particular. I think I've looked the specimens so many times that I began to see differences between them. There seems to be some with convex frontal end and some not (picture 3) and one with slightly arched genals (picture 4). So, the first surprise was to know that they are all from the same species. Suppose there is an evident intra-specific variation in Kymataspis sp. Thank you for adding pictures of other specimens. By the way, where is this species described? Geyer? The negative reason comes from being a biologist and a fossils seller. I browsed so many "detailed" and "scientific" explanations through selling sites that I see that specimens are being presented and sold as what they aren't almost everywhere and not only at eBay. Nothing I didn't know. But it was unexpected from some sites and sellers. So, once again, thanks for your patience, @piranha, and for the existence of this forum. I hope not to disturb too much asking for help here, where opinions are trustful. As a biologist, I prefer to have stand-by stock, taking the time to study and get scientific opinions, and not to post specimens quickly with the first ID it that seems to match. Best regards, Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted June 17, 2017 Share Posted June 17, 2017 20 hours ago, mediterranic said: By the way, where is this species described? Geyer? Correct: Geyer, G. (1990) Die marokkanischen Ellipsocephalidae (Trilobita: Redlichiida) Beringeria, 3:1-363 PDF LINK 2 Link to comment Share on other sites More sharing options...
mediterranic Posted June 19, 2017 Author Share Posted June 19, 2017 These ones from the same place. They aren't Kymataspis , correct? What can they be, with those short genals? Thanks in advance for your opinions, Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted June 19, 2017 Share Posted June 19, 2017 They appear to be Ornamentaspis sp. Here is one with small genal spines. 3 Link to comment Share on other sites More sharing options...
mediterranic Posted June 19, 2017 Author Share Posted June 19, 2017 Indeed. Thanks again. Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted July 8, 2017 Author Share Posted July 8, 2017 Is this time that we have here a Kingaspidoides? Or is it any other ellipsocephalid? I was checking others posts and links on those posts and it is the best call till now. Thanks in advance. Miguel Ah, 2,3 cm. My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 8, 2017 Share Posted July 8, 2017 Similar to Kingaspis or Ornamentaspis. I would label it: ellipsocephalid indet. 2 Link to comment Share on other sites More sharing options...
mediterranic Posted July 8, 2017 Author Share Posted July 8, 2017 I have more that I labelled "similar to #4003" (the one above). Will post them to see if it helps a bit. Thanks, @piranha My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 1st similar one 2nd similar My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 3rd similar My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 And last two Maybe last one is not so similar My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 9, 2017 Share Posted July 9, 2017 All the same: ellipsocephalid indet. 3 Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 Found an untouched one. Maybe with will be easier to get a conclusion like that? Thanks Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 9, 2017 Share Posted July 9, 2017 Without the glabella, this one is even more difficult to evaluate. Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 Is this one finally something identifiable? Protolenus? Thanks in advance Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 9, 2017 Share Posted July 9, 2017 Another ellipsocephalid indet. Compare the figures from Geyer 2004. It is certainly not Protolenus. Geyer, G., & Landing, E. (2004) A unified lower–middle Cambrian chronostratigraphy for West Gondwana. Acta Geologica Polonica, 54(2):179-218 PDF LINK 1 Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 Seeing last Geyer's pics takes me to this one: no genals but the rest seems to match. Maybe Protolenus? My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 9, 2017 Share Posted July 9, 2017 I might label this trilobite: Brevitermierella, as it has more of a parallel-sided glabella. 1 Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 Thanks a lot @piranha A not so parallel sided glabella here. What do you think? Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
piranha Posted July 9, 2017 Share Posted July 9, 2017 I have photos 7 minutes ago, mediterranic said: A not so parallel sided glabella here. What do you think? I also have photos of Brevitermierella with a less parallel-sided glabella. I think it must be the same species: Brevitermierella brevifrons 2 Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 A more interesting rock from Ougnat, now. Two specimens (with a minimum vertical separation of 1,5 cm): one Asaphida (2,3 cm) and one indet. Ellipsocephalid (2,1 cm). The Ellipsocephalid above the Asaphid. What can it be be Asaphid? Thanks in advance, Miguel My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
mediterranic Posted July 9, 2017 Author Share Posted July 9, 2017 Finally a complete one, with genals. 3,3 cm. I think the majority of the ellipsocephalidindet. discussed before are similar (badly prepared) to this one. What can it be? Thanks, Miguel #2137 My Academia.edu profile - My About Me page Link to comment Share on other sites More sharing options...
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