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Showing results for tags 'oepikina minnesotensis'.
Found 4 results
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A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
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- amplexopora
- amplexopora septosa
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Found in both Decorah and Platteville Formation. One of two official Oepikina species found in Decorah and Platteville Formation. #1 shows a distinct feature of Oepikina that most sources doesn't seem to mention that makes it distinct from rest of family branch at least for Decorah/platteville formation - A distinct growth line that always occurs 80% to 90% of the distance from hinge teeth. #2 shows that compare to most if not all brachiopods from Decorah to Platteville Formation, Oepikina is the most extreme in inflated shells, often resembles a cannon ball cut into two dues to its fine costae lines making it looks nearly black in Decorah formation. #3 So far I have only specimens from Platteville formation that shows muscle structures. The lighter colors shows where the muscles are attached to the shell and the darker colors represent the prominent central septae that runs down the middle of O. minnesotensis. It lacks the irregular septae that radiates away from the hinge teeth of some O. inquassa individuals. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
?Oepikina minnesotensis. I'm not 100% sure yet. Oepikina tend to have very fine costae and those specimens are literally loaded with costae making them darker. There's two in the leftmost rock specimens along with a Strophomena. The annoying thing is its hard to see hinge line for a positive id. Among the most inflated brachiopod I have seen from Decorah formation, only inarticulate brachiopods are this inflated. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Oepikina minnesotensis. Occurs mainly in upper Platteville formation. I'm not 100% sure if they occurs in decorah formation as I had found unusual circular inflated shells but its much harder to see their hinge line or muscle scars at present. Either the decorah version is a extreme version of Doleriodes pervetus or Oepikina minnesotensis. They usually differs from Strophomena filitexta into being more compact and rounder, also more inflated. They're much smaller compare to Oepikina inquassa and less variable in shapes. You can see the fossil in the farthest left of the picture have unusual well preserved muscle scar.
