Ptychagnostus Blind Trilobites of Cambrian Utah

Ptchagnostus akanthodes

Trilobites Order Agnostida, Family Ptychagnostidae

Geological Time: Cambrian

Size: 6 mm long by 2 mm wide and 3 mm long by 1 mm wide

Fossil Site: Marjum Formation, Millard County, Utah

Description: Coming from the Cambrian Marjum Formation deposits of Millard County Utah this is an example of a pair of the trilobite Ptychagnostus akanthodes. The members of the Agnostida are mostly thought to have been planktonic in nature. Most are blind, and have a pygidium equal in size to the cephalon (ispopygous), making it hard to tell which end was which! They are remarkably detailed for such tiny specimens, and fully articulated.

click trilobite pictures to enlarge


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