hobbitfeet Posted October 19, 2017 Share Posted October 19, 2017 Over a month ago I found what I believe is my first hypostome near House Springs, Missouri. But it is much larger than the other trilobite pieces that I have found in the area. Since then I have been to the same roadcut and found what I believe to be two larger trilobite tails that might be something like Isotelus which may be the source of the hypostome. I just want other people's opinions if they think I'm on the track. Link to comment Share on other sites More sharing options...
Peat Burns Posted October 19, 2017 Share Posted October 19, 2017 Not sure about the geological context, as I am not familiar with that area, but they look like Isotelus to me, including the hypostome. @piranha? Link to comment Share on other sites More sharing options...
Miocene_Mason Posted October 19, 2017 Share Posted October 19, 2017 The pygidium looks like isotelus to me also, only other thing I could think of would be homotelus (not sure how to tell the difference). “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
Douvilleiceras Posted October 19, 2017 Share Posted October 19, 2017 During the Ordovician, the Family Asaphidae (Order Asaphida) developed strong forks in the hypostome, which distinguishes it from most other types. The example shown here is a good example of such a hypostome, and can be confidently determined to be isoteline in origin. Relevant Papers: "The function of forks: Isotelus-type hypostomes and trilobite feeding," HEGNA (2010) "Feeding Habits in Trilobites," FORTEY (1999) 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...
Fossildude19 Posted October 19, 2017 Share Posted October 19, 2017 +1 for hypostome. Here is my Isotelus hypostome. 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...
Harry Pristis Posted October 19, 2017 Share Posted October 19, 2017 Here's another for comparison: http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
Peat Burns Posted October 19, 2017 Share Posted October 19, 2017 Here's one of mine Link to comment Share on other sites More sharing options...
BenK Posted April 25, 2018 Share Posted April 25, 2018 Just found this thread and wanted to say wow..those plates at the top look IDENTICAL to some where I collect in Ste. Genevieve county. I will post some pics. I will have to reexamine them now but I'm pretty sure I have some pieces like that in there too. Link to comment Share on other sites More sharing options...
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