Ptychagnostus
buckleyi
Class
Trilobita (Trilobites); Trilobite
Order Agnostida; Family Ptychagnostidae
Geological
Time: Middle Cambrian
Size: 5 mm
long by 3 mm wide on a 40 mm by 30 mm matrix pair
Fossil Site:
Upper Fauna, Cassis or Agra Zones, Christmas Hills, Smithton, Tasmania,
Australia
|  Coming
from the Middle Cambrian deposits of Tasmania, this is an example
of a part/counterpart 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! This Ptychagnostus is remarkably detailed for such a tiny
specimen, and is fully articulated.
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