Anomalocaris
sp
Kingdom
Animalia, Phylum Arthropod stem group,
Class Dinocaridida, Order Radiodonta, Family Anomalocarididae
Geological
Time: Upper Middle Cambrian
Size (25.4
mm = 1 inch): Anomalocaris fossil is 35 across on a 100 mm by 90 mm
matrix
Fossil Site:
Marjum Formation, House Range, Millard County, Utah
Fossil Code:
STF07
Price: Sold
|  Description:
This is the oral disc of the “Terror Of The Cambrian”,
Anomalocaris, seen here is the first example I have had from
the Marjum Formation. The members of this group of enigmatic
creatures are known from Asia,  Australia,
Europe, and North America, and are thought by many to be closely
allied with the Arthropda,
a position not held by all researchers. Several have been described
from Utah, notably a 50 mm partial specimen of Anomalocaris nathorsti
from the Marjum Formation, but they are far more rare than those
from
Chengjiang or the Burgess Shale. Many examples of Elrathia have
been found with bite marks, most typically on the right side,
which are thought to have been the result of an abortive attack
by this Cambrian raider. The hard limestone did not render a
perfect preservation, so only one side is well defined. I have
included a negative image with shows both the sectioning of the
disc and the faint opposing side.
Also
see a complete Anomalocaris
fossil from the older Pioche Formation of Nevada.
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