brachiopod ID

[Gen. et sp. indet.]

I found this beauty yesterday in a gravel in central Poland, so it's an ice age gift from Baltic Sea or Scandinavia, Ordovician or Silurian in age. Any ideas? I'm thinking... maybe a billingsellid of some sort? I'm not good at Palaeozoic brachiopods.

[Monica]

I'll tag a couple of brachiopod aficionados: @Tidgy's Dad and @Peat Burns 

[Peat Burns]

It looks like a Terebratulid.  Unfortunately, I can't help with further ID.

[Tidgy's Dad]

I don't know, either. 

It actually looks more like a bivalve in some photos. 

Can you clear off some of the matrix around the umbos / beaks? 

That might help. 

[FossilDAWG]

I'm in the bivalve camp as well.

 

Don

[Gen. et sp. indet.]

Thank you all. Guess it gonna be labeled 'brach or valve' - for now ;-)

I'll try to prepare it a bit, though...