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Showing results for tags 'oepikina inquassa'.
Found 7 results
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
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 -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Top portion of Oepikina inquassa. Heavy coating shows it have fine ridges. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
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. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Unusual Oepikina inquassa. Very rugose in texture and doesn't have any encrusting but still have fine costae thought its harder to see them in this photo. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
More variable in Oepikina inquassa shapes. Those are very strongly like garden shovel shapes. But usually tend to be heavily encrusted. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Bottom half of Oepikina inquassa. Unusually well preserved for subtle muscle scars. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Not especially preserved top layer of Oepikina inquassa. Oepikina inquassa is very highly variable in shapes and mainly only found in Decorah formation, thought I suspects also exists in Platteville. Tend to be larger than Oepikina minnesotensis.
