Wing like bone- which kind of fish is this?

[D.N.FossilmanLithuania]

Dear Guys,

 

I recently found one very interesting wing like bone that is ~1 cm length, it has oblique canals in one side.

The fossil is found in Dauksiai village, Joniskis district, Northern Lithuania. 

One guy in facebook group suggested Listracanthus fin spine but listracanthus spines are more curved and have vertical grooves in surface so I think it is more likely some kind of actinopterygian.

Please let me know which part of fish skeleton it is and what taxon of fishes (family, order) it might belong to.

Any help will be appreciated! 

 

Best Regards

Domas