Name: Kochina vestina Trilobite Order Ptychopariida, Superfamily Ptychoparioidea, Family Ptychopariidae Locality: Utah Stratigraphy: Spence Shale Formation, Middle Cambrian Credits: photographed by Richie Kurkewicz
Name: Esmeraldina sp. Trilobite Order Ptychopariida, Superfamily Ptychoparioidea, Family Ptychopariidae Locality: Utah Stratigraphy: Spence Shale Formation, Middle Cambrian Credits: Collected by Jake Skabelund; Prep and Photo by Dave Comfort
Western Trilobites Association: Trilobite Genera / Species I Trilobite Formations I Trilobite Locations
