Oepikina inquassa

Highly variable brachiopod species which had two invalid species merged into a third species. O. inquassa is the largest of the two Oepikina species. Mainly Decorah Formation but maybe in Platteville Formation but I hadn't found hard evidences yet. #1 shows (its harder to photograph) distinct septae that is pronounced in some individuals and absent in others. It always start with a curved septae and one central septae that goes out a bit of distance. Then in some individuals there are clearly short septae random radiates outward from the center. #2 shows the clear distant growth lines that Oepikina only have. #3 shows the hinge teethes which is the largest and most noticeable among the Strophomenid brachiopods of Decorah Formation. Even O. minnesotensis have much smaller teeth by compare