A Trilobite From Utah
Posted 16 June 2010 - 12:12 PM
One of the bug looked slim at fist glance, the quarry guide said it was the rare Alokistocare and this really made my day. Upon examination under a loupe, the specimen does not seem to have shells and the pygidium. The right pleural lobe is partial but the left genal spine seems to be there. It measures 1.5x1cm. The negative seems to be better defined.
I purchased a copy of "Some Middle Cambrian Fossils from Utah" and tried to follow the descriptions of the trilobites in Wheeler Shale that looked alike. The Alokistocare harrisi should have lots of pustules but mine is smooth (because the shell is missing?). The size of the genal spine (if that one in mine is not artifact) does not look right either. I tried to count the axial rings but the missing of pygidium made it difficult to do so. As the trilobite seems to be incomplete, I wonder if the slim look is due to the missing of right pleural lobe.
So do you think it is an Alokistocare or other common species such as an Elrathia kingi? I appreciate your advice! Many thanks!
Posted 16 June 2010 - 02:16 PM
Posted 16 June 2010 - 03:58 PM
still a nice trilobite whatever it turns out to be.
Posted 16 June 2010 - 04:00 PM
look at westernta.com for reference pics
Posted 16 June 2010 - 04:03 PM
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