Hyolithes cecrops Hyolithid Fossil from Wheeler Shale

Name: Hyolitha; Hyolithes cecrops

Geological Time: Middle Cambrian

Size (25.4 mm = 1 inch): 20 mm long by 7 mm wide on a 53 mm by 70 mm and 45 mm by 40 mm matrix pair

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

Code: CB36

Price: $40.00 - sold

Hyolithid Fossil from Wheeler ShaleDescription: This is a member of the Hyolitha, a phylum with problematic affinities, thought to be related to the mollusks. They are thought to have lived on the Hyolithidsubstrate, resting on the flatter side of the shell for stability. The two stabilizing structures are termed the Helens (named by C.D Walcott of Burgess Shale fame for his daughter). This one has the operculum preserved, a small “lid” which could be closed to protect the Hyolthid from predators.

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