Agnostid Trilobites

Trilobites of Order Agnostida

Agnostid Trilobite Fossils

Ptychagnostus praecurrens Family Ptychagnostidae Burgess Shale, Stephen Formation, BC, Canada	Ptychagnostus michaeli Family Ptychagnostidae Marjum Formation, Millard County, Utah	Serrodiscus gravestocki Family Weymouthidae Flinders Ranges, South Australia	Agnostid Trilobites Association Order Agnostida Marjum Formation, Utah

Ptychagnostus akanthodes Family Ptychagnostidae Marjum Formation, Millard County, Utah	Ptychagnostus praecurrens Family Ptychagnostidae Burgess Shale, Stephen Formation, BC, Canada	Ptychagnostus atavus Family Ptychagnostidae Lower Wheeler Formation, Utah	Ptychagnostus michaeli & Hypagnostus parvifrons Families Ptychagnostidae & Spinagnostidae Marjum Formation, Millard County, Utah