RARE Anomalocaris Oral Disc from Cambrian Utah

Anomalocaris cf nathorsti

Geologic Time: Upper Middle Cambrian

Size: 18 mm by 12 mm

Fossil Site: Wheeler Formation, House Range, Millard County, Utah

Anomalocaris nathorsti Oral DiscDescription: This is the oral disc of the “Terror Of The Cambrian”, Anomalocaris saron, seen here in the first example I have had. The members of this group of enigmatic creatures are known from Asia, Australia, AnomalocarisEurope, 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 A nathorsti from the Marjum Formation, but they are far more rare than those from the Chengjiang Maotianshan Shales 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.

See a putative Anomalocaris nathorsti Fossil from the Utah Weeks Formation

Also see: Cambrian Explosion Fossils of Utah

click to enlarge

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