Brachiopod ID help

[paleo.nath]

This fossil was found by an old friend of mine in maine, and I need some help with the ID on it. All i know is that it is from maine and that it is a brachiopod (the largest fossil present)

[JimB88]

This will be hard to narrow down without knowing the age of the formation it came from. To me it looks like a spirifer of some sort; but thats hard to tell with just the outside of the shell visible.

[Fossildude19]

Any idea where in Maine it came from?

My first impression is that it is an Acrospirifer sp.,  possibly Acrospirifer atlanticus.  

 

 

[paleo.nath]

I’m not too sure where it came from, my grandfather found it a while back and he is in no condition to tell me where it’s from haha

[Misha]

Interesting, I didn't know Maine had such fossils.

As for the ID, I agree that this looks like a spiriferid brachiopod, but it is hard to say more than that.

[Monica]

I imagine that brachiopod-loving @Tidgy's Dad and @Peat Burns might like to have a look