RARE Grasping Appendage of Anomalocaris from Nevada

Anomalocaris cf saron

Phylum Uncertain, Anomalocarididae

Geological Time: Early Middle Cambrian

Size (25.4 mm = 1 inch): Anomalocaris fossil is 25 mm long (curve measure) on a 50 mm by 90 mm matrix

Fossil Site: Pioche Formation, Comet Shale Member, Eokochaspis nodosa subzone, Lincoln County Nevada

Fossil Code: MMT156

Price: Sold

Anomalocaris Grasping AppendageDescription: 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; A. pennsylvanica and A. 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. The center image below was water wet to increase contrast. Also see a complete Anomalocaris fossil.

Reference: Journal of Paleontology, 77 (4), 2003, pp 674-690.

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