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As I've been cataloging my Devonian finds, in my research I've come across both mucrospirifer and mediospirifer. I'm not certain of the characteristics that would set the two apart. Can anyone provide some clarity or point me towards a resource that could?

Hey everyone, I’m curious what the folks on the forum think of this brachiopod. When I was visiting Gerry Kloc last month we were talking about every topic under the sun and undescribed species were one. He made mention of a Hamilton group brachiopod that was in between a Mediospirifer and Spinocyrtia. As soon as he said that I thought...”hey I think I have one of those!” Anyway....it’s a brach I’ve had for a while that I literally had on display sitting between my Mediospirifers and Spinocyrtias cause it literally didn’t fit either but seemed to fall in between. I thought maybe I had a weird oversized Mediospirifer but I’m willing to hear the forums opinion. Perhaps there is some literature I’m unaware of. I can’t call this a Mediospirifer or a Spinocyrtia. Ill let you all decide lol. Also, Sorry ahead if time....I don’t have a picture with an official scale I thought I took one!!! I’ll update an extra photo later today with a scale bar. This shows a Mediospirifer on top...brach in question in the middle and Spinocyrtia on the bottom. the flipside showing all 3 specimens again. I tried showing my most exemplary Mediospirifer and Spinocyrtia to make the best comparison possible. More pics of the specimen alone from all angles to come!