Hello, this is a vertebral centrum of a skate, family Rajidae,e.g. Raja clavata, R. radiata, Dipterus batis and several other. Look for dermal spines in your sample, they can sometimes be identified to species. If you have sieved down to 1-2 mm mesh size there can also be teeth found.
We have a lot of skates and spiny dog fish in 16th century Gothenburg. Some of our Rajidae are big and must come from Dipterus sp.
Leif Jonsson
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