holdinghistory Posted November 17, 2017 Share Posted November 17, 2017 I found a few lists of trilobite species from Utah, but am having trouble finding any information on telling the Agnostid species apart. Looking for some sort of papers, book, illustrations, pictures or something that can help me make sense of the differences between, say, Baltagnostus eurypyx, Itagnostus interstricta, Peronopsis interstricta, and etc. Thanks! Link to comment Share on other sites More sharing options...
izak_ Posted November 17, 2017 Share Posted November 17, 2017 @piranha Link to comment Share on other sites More sharing options...
Douvilleiceras Posted November 17, 2017 Share Posted November 17, 2017 Naimark, 2012 has the descriptions of many trilobites formerly in the genus Peronopsis. Also, Naimark reclassified Peronopsis interstricta as Itagnostus interstrictus, so there isn't a difference between the two, as one is just the outdated name for the same bug. Regards, Jason "Trilobites survived for a total of three hundred million years, almost the whole duration of the Palaeozoic era: who are we johnny-come-latelies to label them as either ‘primitive’ or ‘unsuccessful’? Men have so far survived half a per cent as long." - Richard Fortey, Trilobite: Eyewitness to Evolution. Link to comment Share on other sites More sharing options...
holdinghistory Posted November 17, 2017 Author Share Posted November 17, 2017 Thanks! I will read through that. Link to comment Share on other sites More sharing options...
FossilDAWG Posted November 18, 2017 Share Posted November 18, 2017 My experience has been that many of the agnostid genera and species are hard to tell apart unless you have very well preserved specimens with the shell. Internal molds and flattened specimens in shale are often very difficult to work with. Don Link to comment Share on other sites More sharing options...
KimTexan Posted November 18, 2017 Share Posted November 18, 2017 @doushantuo almost always has an article. I’m constantly amazed by how resourceful he is or filled with resources. I know I have seen a resource on TFF like that before though. Link to comment Share on other sites More sharing options...
Sagebrush Steve Posted November 18, 2017 Share Posted November 18, 2017 8 hours ago, holdinghistory said: I found a few lists of trilobite species from Utah, but am having trouble finding any information on telling the Agnostid species apart. Looking for some sort of papers, book, illustrations, pictures or something that can help me make sense of the differences between, say, Baltagnostus eurypyx, Itagnostus interstricta, Peronopsis interstricta, and etc. Thanks! Not sure where in Utah you are looking but if it’s the Wheeler shale I believe only Itagnostus interstricta is found there. Link to comment Share on other sites More sharing options...
doushantuo Posted November 18, 2017 Share Posted November 18, 2017 Itagnostus is(I think)revised in this one I've singled this one out,but I don't know why OePIKPLATES Oepiktext Might als be present in Fruitbat's slightly underilluminated and underutilized LIBRARY edit:Piranha posted this one in 2015,i belatedly saw.Kudos to Scott,who might just be the man to delve much deeper into this ,As Foosil pointed out Link to comment Share on other sites More sharing options...
doushantuo Posted November 18, 2017 Share Posted November 18, 2017 sherg1990 Does anyone have Cotton/Fortey(2005),BTW? Link to comment Share on other sites More sharing options...
holdinghistory Posted November 18, 2017 Author Share Posted November 18, 2017 8 hours ago, Sagebrush Steve said: Not sure where in Utah you are looking but if it’s the Wheeler shale I believe only Itagnostus interstricta is found there. I have quite a few Wheeler ones, and I know that Itagnostus is the species found there. I am trying to look at the area as a whole (Utah/Nevada area) to try and figure out the species differences, since most seem somewhat haphazardly labeled. Link to comment Share on other sites More sharing options...
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