Blind Trilobites of Cambrian Utah
Order Agnostida, Family Ptychagnostidae
mm long by 2 mm wide and 3 mm long by 1 mm wide
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.
trilobite pictures to enlarge
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