Merista tennesseensis brachiopod from Tennessee

Today I have a brachiopod specimen called Merista tennesseensis from the Silurian (Wenlock epoch) aged Bob Limestone member of the Brownsport Formation. It was found near Bath Springs, TN. I was confused when I saw the name at first because of the similarity to Meristella (let alone Meristina!) but it is a completely different genus.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

I found a couple of records on Yale's online collection of fossils in their Peabody Museum for Merista tennesseensis. This one was the only one that had a decent specimen picture.

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.