minnbuckeye Posted June 11 Share Posted June 11 Yesterday, I split open a piece of Ordovician matrix in attempts to extract a Hormatoma. To my surprise, a HUGE Isotelus hypostome was hidden inside the rock. Is there a formula to calculate to the size of the trilobite based on the size of the hypostome? I will post pictures of it later on in a separate post (fossil hunting trips). Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 11 Share Posted June 11 @piranha Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "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...
Isotelus2883 Posted June 11 Share Posted June 11 If you estimate cephalon size with your hypostome, there is some good data you can use to find body length. Biometric and Taxonomic Analysis of the Genus Isotelus (Trilobita) from Cincinnatian (Upper Ordovician) Rocks of Ohio, Kentucky, and Indiana The type species of the Ordovician trilobite genus Isotelus: I. gigas Dekay, 1824 1 Link to comment Share on other sites More sharing options...
minnbuckeye Posted June 11 Author Share Posted June 11 @Isotelus2883, Thanks for the articles. All I have is the hypostome. Scanning the above articles does not seem to provide the correlation of trilobite size to the hypostome. Link to comment Share on other sites More sharing options...
Isotelus2883 Posted June 12 Share Posted June 12 I couldn’t find anything about that. I think the best you can do is find some images of ventrally preserved Isotelus with their hypostomes in place. Link to comment Share on other sites More sharing options...
minnbuckeye Posted June 12 Author Share Posted June 12 @Isotelus2883, I did some ratios of hypostome length to trilobite length from a drawing in one of the articles suggested. The length of the trilobite belonging to this hypostome would be in the neighborhood of 15 inches! 2 Link to comment Share on other sites More sharing options...
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