Mesopholidostrophia semicircularis brachiopod from Eifel, Germany

The nacerous shell of Mesopholidostrophia semicircularis is typical of the genera. It can be seen in it's N. America cousins, Pholidostrophia nacera, which are common in the Givetian stage of the middle Devonian. The specimen of M. semicircularis shown below comes from the Eifelian stage (Devonian) of the Junkerberg formation near Gondelsheim, Eifel region, Germany.

Specimen #1
Pedicle valve

Anterior

Brachial valve

Posterior

Profile

Specimen #2
Pedicle valve

Anterior

Posterior

Profile

Examples of  Pholidostrophia geniculata from the Silica Shale of Ohio, Pholidostrophia nacrea from the Widder formation of Ontario, Canada and the Mahantango formation of Pennsylvania.