Anazyga recurvirostis (formerly Zygospira)
Very recently in 2023 paper came out that basically places all Zygospira earlier than Mayville/Richmondian in genus Anazyga. Cinnicinntea website also had name change for Anazyga recurvirostis since it also extends into maysville formation. The Decorah Formation Twin Cities can have a lot of those but oddly enough to me they are very specific to muddy limestone as I never find them in the weaker shales for unknown reasons. One of the tiniest Decorah Formation Brachiopod species I have ever found, tiny enough to balance on eraser end of pencil. Compare to the other Anazyga species it is much smaller and more inflated in shape.
From the album:
Brachiopods of Platteville/Decorah Twin Cities Minnesota
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