Another common brachiopod from the middle Devonian period is Cyrtina. This is a triangular shaped brachiopod with a pedicle valve that is much larger than the brachial valve. I've found at least two species of Cyrtina at Arkona.
This is Cyrtina hamiltonensis with a very curved pedicle valve.
This is Cyrtina coultisorum which is much smaller than the above species.
There is a third species that can be found in the Arkona shale but I have not been lucky enough to collect one. Pictures of the above species can be found on the Friends of the UMMP website Here and Here.