Mochaccino Posted February 16, 2023 Share Posted February 16, 2023 Hello, Could someone explain the specific distinctions between the Pennsylvanian-aged proetid trilobites Ameura vs. Ditomopyge vs. Paladin? They all seem quite similar-looking trilobites so I often have a hard time distinguishing them. Thankfully @piranha has already outlined Paladin vs. Ditomopyge in a PM, but I would like to know a comparison with Ameura as well. Thank you. Link to comment Share on other sites More sharing options...
piranha Posted February 16, 2023 Share Posted February 16, 2023 The pygidium of Ameura is elongate with more segments. Only Ditomopyge has a median preoccipital lobe. figures from: Moore, R.C. (ed.) 1959 Treatise on Invertebrate Paleontology. Part O. Arthopoda 1. Trilobita. Geological Society of America and University of Kansas Press: 560 pp. Brezinski, D.K. 1988 Appalachian Carboniferous Trilobites. Journal of Paleontology, 62(6):934-945 PDF LINK 9 Link to comment Share on other sites More sharing options...
Mochaccino Posted February 16, 2023 Author Share Posted February 16, 2023 4 hours ago, piranha said: The pygidium of Ameura is elongate with more segments. Only Ditomopyge has a median preoccipital lobe. figures from: Moore, R.C. (ed.) 1959 Treatise on Invertebrate Paleontology. Part O. Arthopoda 1. Trilobita. Geological Society of America and University of Kansas Press: 560 pp. Brezinski, D.K. 1988 Appalachian Carboniferous Trilobites. Journal of Paleontology, 62(6):934-945 PDF LINK Thank you! This is extremely clear. I have to say, though the distinctions are evident in these diagrams, it's no wonder I have a hard time distinguishing these subtleties with all the variation in preservation and individual specimens. 1 Link to comment Share on other sites More sharing options...
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