Brachiopod ID

[Mainefossils]

Fossil Forum, 

 

I recently found multiple brachiopods that I believe are in the genus Salopina, moved from Orthis, and of the same species. I found them in the Leighton Fm, Maine, which is Silurian. I was wondering if anyone could tell me what the species was, and also if anyone had any literature on this genus. Here are some pictures of them (internal molds are on the left, external on the right): 

     

 

     

 

 

     

 

     

 

 

 

[Thomas.Dodson]

Maybe @Tidgy's Dad can help. Scale reference won't hurt either.

[Mainefossils]

Sorry, I forgot to add the images. It is edited now. 

[LabRatKing]

48 minutes ago, Mainefossils said:

Fossil Forum, 

 

I recently found multiple brachiopods that I believe are in the genus Salopina, moved from Orthis, and of the same species. I found them in the Leighton Fm, Maine, which is Silurian. I was wondering if anyone could tell me what the species was, and also if anyone had any literature on this genus. Here are some pictures of them (internal molds are on the left, external on the right): 

     

 

     

 

 

     

 

     

 

 

 

I'm thinking Resserella sp. , but I am by no means very good at brachipods, and I'm not finding many good views of that genus.

 

This is an mazing specimen as it displays the both sides of both valves, making ID much easier!

 

Not sure if you have seen this:

https://digitalmaine.com/cgi/viewcontent.cgi?article=1575&context=mgs_publications

[Mainefossils]

13 minutes ago, LabRatKing said:

I'm thinking Resserella sp. , but I am by no means very good at brachipods, and I'm not finding many good views of that genus.

 

This is an mazing specimen as it displays the both sides of both valves, making ID much easier!

 

Not sure if you have seen this:

https://digitalmaine.com/cgi/viewcontent.cgi?article=1575&context=mgs_publications

Thanks for the website. I have found it helpful in identifying many of the species in this formation. I thought it could be Salopina because it was named as one of the major brachiopod species found in this formation, from this website - https://digitalmaine.com/cgi/viewcontent.cgi?article=1291&context=mgs_maps, and because it looks very similar - https://www.researchgate.net/figure/Salopina-mediocostata-Strusz-1982-a-AM-F110130-small-ventral-internal-mould-compare_fig4_266221533. But, the classification has changed very much, as I have learned, since 1977. I also see how Resserella is similar, and will take another look. Thanks so much for looking at this!

[Tidgy's Dad]

I'm afraid I don't know the brachiopods from this formation and have no literature.

Resserella would have a more prominent and irregular median ridge system and the shell would be notably more planoconvex in most cases.

It's the right oval shape for Salopina and has the correct internal valve structure, would need to see the interarea to be sure, but could be.