Aulacella prisca is unusual for me in that I can't seem to match it to any other genera that I've found in the Devonian here in the US. It comes from the Skaly Beds near Kielce, Poland which are dated to the middle Devonian (Eifelian to Givetian stages).
Brachial vale
Anterior
Pedicle valve
Posterior
Profile
According to Paleodb.org Aulacella are known from the upper Devonian of Iowa and Ohio.
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