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Oepikina inquassa - While sorting through this spring collection of brachiopods this one stood out. It came from the soft shale so was mostly intact instead of embedded into limestone which makes seeing underside difficult if not impossible. From the documentary: Oepikina inquassa is larger than Oepikina minnesotensis and is less convex. No muscle scar ridges check. Strong medium septum omits S. billingi check. Fine ridges you can see by all that iron particles/clay sticking to it check. Is more delicate than I thought plus this one have a weird quirk - two strong ridges can be seen running down it and connected to the septum. The documentaries didn't mention this, interesting. You can see hinge teeth is prominent but much smaller compare to Rafinesquina interesting.