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Showing results for tags 'strophomena filitexta'.
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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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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
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.-
- brachiopod
- decorah formation
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Strophomena filitexta - very abundant in both decorah formation and platteville formation. Usually more variable in shape and get bigger in decorah formation.-
- brachiopod
- minnesota
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