Ptychopariida Trilobites

from Utah's Weeks Formation


Nephalicephalus beebi

Trilobites Order Ptychopariida, Suborder Ptychopariina, Superfamily Ptychoparioidea, Family Menomoniidae

Weeksina unispina

Trilobites Order Ptychopariida, Suborder Ptychopariina, Superfamily Ptychoparioidea, Family Cedariidae

Menomonia semele

Trilobites Order Ptychopariida, Suborder Ptychopariina, Superfamily Ptychoparioidea, Family Menomoniidae

Geologic Age: Middle Cambrian
Nephalicephalus is 10 mm. Weeksina unispina is 8 mm. Menomonia is 3 mm.
Weeks Formation, House Range, Millard County, Utah
Comment: Three different Ptychopariid trilobites in a mass mortality, all within Superfamily Ptychoparioidea.

Also see: American Trilobites

 

 

 

 

 

 

 

 

 

 

 

Ptychopariida Trilobites from Weeks Formation

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