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Hesperonomia planidorsalis

Rhynchonellata - Orthida - Hesperonomiidae

Taxonomy
Hesperonomia planidorsalis was named by Ulrich and Cooper (1936). It is a 3D body fossil. Its type locality is northeast shoulder of Fossil Mountain, 8.7 miles northeast of Lake Louise, which is in a Stairsian/Blackhillsian marine shale in the Outram Formation of Canada. It is the type species of Hesperonomia.

Sister species lacking formal opinion data
H. dinorthoides