olorotitan Posted February 23, 2019 Share Posted February 23, 2019 (edited) Hi there, I have an old trilobite that I bought 20 years ago as a pre-teen that I have now completely forgotten all details of. I remember it was from a US locality, definitely a cambrian age trilobite. It's pretty small, measuring about 7 - 8 mm. Looking at it now I think it's a Zacanothoides or Olenellus but I cant be sure. It has a long genal spine and what looks to be an impression of another spine at the tip of its pygidium. As a bonus, if anyone recognizes the locality from the look of the matrix that would be awesome. I was thinking Pioche Formation in Nevada but could be wrong. Edited February 23, 2019 by olorotitan Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 23, 2019 Share Posted February 23, 2019 Welcome to the Forum. Cropped and contrasted: Looks like Pioche Shale of Nevada. @piranha 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...
olorotitan Posted February 23, 2019 Author Share Posted February 23, 2019 @fossildude19 Thanks for the assistance. I didn't think about cropping it- that helps. Link to comment Share on other sites More sharing options...
piranha Posted February 23, 2019 Share Posted February 23, 2019 Zacanthoides has a long thoracic spine. The pygidium is absent on the posted specimen. Attached is another similar example. figure from: Gon, S.M. 2009 A Pictorial Guide to the Orders of Trilobites. 1 Link to comment Share on other sites More sharing options...
suchomimus20 Posted April 28, 2019 Share Posted April 28, 2019 the one that resembles it the most is the Olenellus Link to comment Share on other sites More sharing options...
DevonianDigger Posted April 28, 2019 Share Posted April 28, 2019 +1 for Zacanthoides Jay A. Wollin Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve Hamburg, New York, USA Link to comment Share on other sites More sharing options...
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