Archie Posted January 2, 2020 Share Posted January 2, 2020 Hi everyone, I recently purchased this trilobite from a museum gift shop and unfortunately it came with no locality, formation or species information and I haven't been able to find anything similar online. Does anybody recognize it? The larger of the two is 18mm long and the matrix is very soft. Any info much appreciated! Link to comment Share on other sites More sharing options...
Fossildude19 Posted January 2, 2020 Share Posted January 2, 2020 Hey Sam! Looks like Illaenula vietnamica, (Ductina), from China, to me. I believe these are Devonian in age. 5 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
piranha Posted January 2, 2020 Share Posted January 2, 2020 Is it an optical illusion on my part ...or does the larger specimen have eyes? 2 Link to comment Share on other sites More sharing options...
Archie Posted January 2, 2020 Author Share Posted January 2, 2020 1 hour ago, Fossildude19 said: Hey Sam! Looks like Illaenula vietnamica, (Ductina), from China, to me. I believe these are Devonian in age. Thanks Tim! I think you've got it the matrix looks a good match too! 26 minutes ago, piranha said: Is it an optical illusion on my part ...or does the larger specimen have eyes? I think it must be an optical illusion I don't see any compound eye lenses under magnification but then I think its an internal mold there was a thin gap between it and the matrix when I prepped out a bit more of the Cephalon. Link to comment Share on other sites More sharing options...
piranha Posted January 2, 2020 Share Posted January 2, 2020 Not eye lenses, in the photo it looks like possible palpebral lobes. 2 Link to comment Share on other sites More sharing options...
Scylla Posted January 3, 2020 Share Posted January 3, 2020 1 hour ago, Fossildude19 said: Hey Sam! Looks like Illaenula vietnamica, (Ductina), from China, to me. I believe these are Devonian in age. Nice, now I have to change my Ductina labels 1 Link to comment Share on other sites More sharing options...
Archie Posted January 3, 2020 Author Share Posted January 3, 2020 58 minutes ago, piranha said: Not eye lenses, in the photo it looks like possible palpebral lobes. Oh I haven't come across this term before! Are they sensory organs? Sorry my knowledge of trilobites is extremely lacking, I love them but have no luck with finding them. I'll get a close up pic in the daylight tomorrow. 50 minutes ago, Scylla said: Nice, now I have to change my Ductina labels I've just had to do this with a species of Holocephalan tooth for about twenty specimens Link to comment Share on other sites More sharing options...
connorp Posted January 3, 2020 Share Posted January 3, 2020 9 minutes ago, Archie said: I've just had to do this with a species of Holocephalan tooth for about twenty specimens Oh goodness What species? Link to comment Share on other sites More sharing options...
piranha Posted January 3, 2020 Share Posted January 3, 2020 21 minutes ago, Archie said: Oh I haven't come across this term before! Are they sensory organs? Sorry my knowledge of trilobites is extremely lacking, I love them but have no luck with finding them. I'll get a close up pic in the daylight tomorrow. 'Palpebral' refers to the eye flange: Latin for eyelid 3 Link to comment Share on other sites More sharing options...
Wrangellian Posted January 3, 2020 Share Posted January 3, 2020 To add to the foregoing, I got this info for my specimens, but can't guarantee any of it (unless it came from Scott perhaps!): Lower Devonian - Emsian stage Tianding Formation Luofa District, Nandan County, Guangxi, China. 1 Link to comment Share on other sites More sharing options...
Archie Posted January 3, 2020 Author Share Posted January 3, 2020 8 hours ago, connorp said: Oh goodness What species? Its one of the most common tooth plates in the coal measures of this area, Helodus (Pleuroplax) rankinei (Agassiz) was the name given in the literature I had at the time when I was first labeling them but more recent papers give the name as Pleuroplax rankinei (Hancock & Atthey 1872). These tooth plates are also believed to be formed from the fusion of individual teeth in files such as Helodus simplex the type species for Helodus, which I have a couple of examples of articulated with P. rankinei so it seems likely it will at some point be moved back into Helodus and I'll have to re-label again! 8 hours ago, piranha said: 'Palpebral' refers to the eye flange: Latin for eyelid Ah of course, thank you! Heres a close up photo of the Cephalon in good light. 7 hours ago, Wrangellian said: To add to the foregoing, I got this info for my specimens, but can't guarantee any of it (unless it came from Scott perhaps!): Lower Devonian - Emsian stage Tianding Formation Luofa District, Nandan County, Guangxi, China. . That's brilliant thank you! Link to comment Share on other sites More sharing options...
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