Ventral Preparation
Triarthrus eatoniTrilobites Order Ptychopariida, Suborder Olenina, Family Olenidae, Subfamily Triarthrinae Geological Time: Late Ordovician Size: Trilobite is 22 mm long with 5 mm antennae Fossil Site: Lorraine Shale, Lewis County, New York |
click trilobite pictures to enlarge
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