Atrypa tennesseensis brachiopod from Tennessee

Another brachiopod from the Bob Limestone member of the Brownsport Formation (Silurian, Wenlock Epoch) is Atrypa tennesseensis. Atyrpa is a very common brachiopod in the Silurian and Devonian. It appears that this species can be distinguished from the more widely know A. reticularis species by the lesser number of rays ornamenting the shell. In fact, to my eyes, the shell ornamentation looks more like a Spinatrypa type.

The specimen above came from the Bath Springs area of Tennessee. Compare this to A. reticularis from the Lockport limestone of New York or A. oklahomensis from the Haragan formation of Oklahoma.