Sauropterygia indet.
Middle Triassic, Lower Muschelkalk (Anisian), Gogolin Beds, Upper Silesia, Poland
An isolated femur of Sauropterygia indet. The damaged (eroded) epiphysis reveals a spongy bone structure in this area (the shaft, in turn, is unusually dense). Those are characteristic features of Sauropterygia long bones.
The specimen lacks features that would allow for a more precise identification.
I originally assigned the specimen incorrectly to Pachypleurosauridae cf. Dactylosaurus.
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