Strophomena filitexta
By Tetradium
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Most abundant of the three Strophomena species in Decorah Formation and the largest. #1 shows the most significant feature that differs S. filitexta from S. billingi - the complete enclosed muscle ridges. #2 shows the significant different (at least in individuals that have both halves of shells) between Strophomena from Oepikina/Rafinesquina. Only Strophomena have the triangular structure enclosing where its weak hinge teeth are. #3 Shows the diversity into shapes - this is one of the few highly inflated forms I have found of S. filitexta. I have a lot of difficulty telling the smaller individuals apart between S. filitexta and S. billingi at present if muscle scars is not shown.
From the album:
Brachiopods of Platteville/Decorah Twin Cities Minnesota
· 48 images- 48 images
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Photo Information
- Taken with Apple iPad (7th generation)
- Focal Length 3.3 mm
- Exposure Time 1/24
- f Aperture f/2.4
- ISO Speed 200
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