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This species of Isotelus is yet to be formally described. It has been given the provisional species name (suspended under quotation marks) as "mafritzae." There are two known types (A and B ) of I. "mafritzae" that occur exclusively in the Lindsay Formation: Type A have long, slender genal spines, while Type B have none. See: Rudkin, D.M. & Tripp, R.P. 1987 A reassessment of the Ordovician trilobite Isotelus, part II: Ontario species. Canadian Paleontology and Biostratigraphy Seminar, London, Ontario, Sept. 1987.
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Just seeking to verify whether or not this is a Leviceraurus mammiloides or just plain Ceraurus sp. Found yesterday in the Lindsay Fm (Ordovician) in Ontario. If the former, it is sadly missing the long pygidial spines. Prepping this one is a bit of a challenge as it is fragile in places, and the matrix is very stubborn (I may have to get someone else to fix this one). I've done what I could with abrasion. Specimen is very small: 1.5 cm. For comparison, the specimen and the line illustration from Hessin's book. The genal spines don't look quite long enough to be a Levi, but the spine appears broken off before the termination point.
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