Brachiopod help

[Peat Burns]

This looks similar to Mucrospirifer, especially the growth lines, but the interarea doesn't look right to me.  I thought perhaps Brachyspirifer, but not sure if they exhibit growth lines like this.  This is from the Middle Devonian Bell Shale.  Scale in cm/mm. @Tidgy's Dad

 

[FossilDAWG]

Maybe something along the lines of Cyrtina?  That big interarea and the triangilar profilesuggests that ID to me.

 

Don

[Tidgy's Dad]

Yes, a weird one. 

As you says, the growth lines and shape are suggestive of Mucrospirifer but the interarea is all wrong. 

I also agree it is close to Brachyspirifer but I also have never seen one with growth lines like this. 

Doesn't seem to be the right profile for Cyrtina either. 

Hmmm. 

[Peat Burns]

1 minute ago, Tidgy's Dad said:

Yes, a weird one. 

As you says, the growth lines and shape are suggestive of Mucrospirifer but the interarea is all wrong. 

I also agree it is close to Brachyspirifer but I also have never seen one with growth lines like this. 

Doesn't seem to be the right profile for Cyrtina either. 

Hmmm. 

Well, I'm glad you're as perplexed as I am.  I spent quite a while comparing with my Mucrospirifer specimens. Unfortunately, I don't have any Brachyspirifer, and good images online are hard to find.  This is the picture in the book of Brachyspirifer from the Bell Shale.  Not seeing the growth lines.

[FossilDAWG]

Maybe Tylothyris?

figure source

 

Don

 

[Peat Burns]

27 minutes ago, FossilDAWG said:

Maybe Tylothyris?

figure source

 

Don

 

Hey, now there's a possibility.  Thank you. I'll look into that.  I compared with possible Cyrtina spp., and the fold/sulcus, plications, beak, and growth lines don't quite match.  Photos from Ehlers and Kesling "Devonian Strata of Alpena and Presque Isle Counties, Michigan".

 

Cyrtina umbonata

[Tidgy's Dad]

I think Tylothyris is a better match than Cyrtina.

Can we have a profile/ side view of your specimen please, Tony? 

[Peat Burns]

2 minutes ago, Tidgy's Dad said:

I think Tylothyris is a better match than Cyrtina.

Can we have a profile/ side view of your specimen please, Tony? 

Yep. T. rockportensis is looking similar.  Here's a side view of mine.  Definitely consistent with Tylothyris.

[Tidgy's Dad]

Certainly closest so far. 

I think Don has got it.

[Shamalama]

That is a cool looking brach! I'm glad you figured out who it was.