The Skaly Beds of Poland have a Productella species called Productella varians. It is very similar to P. spinulicosta that I have found at Arkona, Canada (albeit larger).
Specimen #1
Pedicle valve
Anterior
Brachial valve
Posterior
Profile
This view gives you an idea of the concavity of the ventral side of the shell.
Specimen #2
Pedicle valve
Anterior
Brachial valve
Posterior
Profile
The specimens shown came from in the Skaly Beds near Kielce in the Holy Cross Mountains of Poland. The rocks are dated to the middle Devonian (Eifelian to Givetian stages).
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