glossy skull bone- lungfish or megalichthyid?

[D.N.FossilmanLithuania]

Dear Guys,

 

This summer I found these two fossils in the same fluvial sandstone erratic boulder- the first is possible procoracoid bone of Pelycosaur (the specialist thinks it belongs to reptile or reptiliomorph amphibian), and the second is glossy skull bone of sarcopterygian fish (probably lungfish but also could belong to megalichthyid). The procoracoid bone is 1.4 cm length and the skull bone of fish is 5 mm length.  The erratic boulder was found in Dauksiai village, Joniskis district, Northern Lithuania.

Please help me to know which kind of fish this skull bone belongs to.

Any help will be appreciated!

 

Best Regards

Domas

[Fossildude19]

Due to the size of the skull piece, I would say it is more likely a ray-finned fish. 

Looks like an opercular, or subopercular, to me.   Not sure you can say more than that about it. 

 

[jdp]

Not convinced by either ID. Second object looks vaguely like a range of bones you see in various paleozoic fish skulls, from the inner surface. 

[Zenmaster6]

1 hour ago, jdp said:

Not convinced by either ID. Second object looks vaguely like a range of bones you see in various paleozoic fish skulls, from the inner surface. 

I would say you're spot on with the lungfish theory. Just me though. Cannot speak for the first specimen. Good luck!

[jdp]

Neither of those look like lungfish to me. The texture on the first might be cosmine, which would be consistent with a range of Devonian animals, but is not strictly a lungfish feature. I think OP is overinterpreting these elements.