Anomalocaris
cf saron
Phylum Uncertain,
Anomalocarididae
Geological
Time: Early Middle Cambrian
Size: Anomalocaris
fossil is 25 mm long (curve measure) by 10 mm at base on a 60 mm by
35 mm matrix
Fossil Site:
Pioche Formation, Comet Shale Member, Eokochaspis nodosa subzone, Lincoln
County Nevada
Fossil Code:
MMT155
Price: Sold
|  Description:
This is the grasping arm of one of the “Terrors Of The
Cambrian” known as Anomalocaris. 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. The
spiniferous grasping  appendages
are strongly suggestive of its carnivorous habits; some trilobites
from Utah bear evidence of
bite marks that have been attributed to its near relative Anomalocaris
nathorsti. This example comes from a soft-bodied preservation
site known for some ten years. Two species are currently known;
Anomalocaris pennsylvanica and Anomalocaris cf saron. The fact
that the cranidium of a trilobite identified as Eokochaspis places
it
in the slightly
younger strata that houses A. cf saron. Both horizons are somewhat
older than the celebrated Burgess Shale of British Columbia.
Also see a complete Anomalocaris
fossil.
Reference:
Journal of Paleontology, 77 (4), 2003, pp 674-690.
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