HannahB Posted December 21, 2022 Share Posted December 21, 2022 Hello, I bought this trilobite today for a very reasonable price, but it didn’t come with a species or genus label so I was wondering if I could have some help identifying. It does say it’s from Russia, and is from 450 Ma. I was thinking Asaphus lepidurus but I’m not sure. 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 21, 2022 Share Posted December 21, 2022 @Kane @piranha Looks like some sort of Asaphus sp. 1 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...
Kane Posted December 21, 2022 Share Posted December 21, 2022 Asaphus lepidurus would be a reasonable guess. 1 1 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
piranha Posted December 21, 2022 Share Posted December 21, 2022 The pygidium has some useful diagnostic features. Could you please post a sharply focused photo? Link to comment Share on other sites More sharing options...
HannahB Posted December 22, 2022 Author Share Posted December 22, 2022 hi @piranhaheres a pic Link to comment Share on other sites More sharing options...
piranha Posted December 22, 2022 Share Posted December 22, 2022 Asaphus lepidurus should have 6-8 pygidial axial rings and faint terracing lines. There are a few species that are a better match with fewer axial rings as seen in this specimen, but I would hesitate to go beyond Asaphus sp. because the height of the eyes can't be accurately determined. Link to comment Share on other sites More sharing options...
HannahB Posted December 22, 2022 Author Share Posted December 22, 2022 3 hours ago, piranha said: Asaphus lepidurus should have 6-8 pygidial axial rings and faint terracing lines. There are a few species that are a better match with fewer axial rings as seen in this specimen, but I would hesitate to go beyond Asaphus sp. because the height of the eyes can't be accurately determined. could it be possible it is Asaphus kowalewskii with its eyes having been lost in the excavation process? i have compared many images and the space of the eyes are closer like in this species and the eyes also seem to end abruptly, looking more like the beginning of a stalk Link to comment Share on other sites More sharing options...
piranha Posted December 22, 2022 Share Posted December 22, 2022 Without the eyes I would label it: Asaphus sp. When a key diagnostic feature is absent 'sp.' has to suffice. 1 Link to comment Share on other sites More sharing options...
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