Pseudoatrypa devoniana from Iowa

Pseudoatrypa devoniana (Webster 1921)
From the Devonian,Frasnian stage.
Collected from Rockford Iowa,U.S.A.
A superb complete brachiopod from the Cerro Gorda member of the Lime creek formation some absolutely stunning shell detail,this is one of the nicest of these i have come across.
Loose from matrix and measuring 20mm x 18mm.