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Denis Arcand

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Hi,

 

I am still new at identifying brachiopods, I know there is a great diversity of similar species, which makes it even more difficult for me.


Can you help me identify these two brachiopods, they both feature a semicircular outline, concavo-convex profile, and small size (~1.0 cm wide). They also have a wide, straight hinge numerous and very fine lines and ribs.

 

Not sure if they are the same species, one of them has a larger size with a bit smaller width compared to length. So I don't think they are the same species.

 

The plate was found in the Nicolet River Formation south of Montreal, QC

 

Any help would be appreciated, thanks !

 

IMG_20220508_100952b_Scalbar.jpg

Edited by Denis Arcand
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Both Sowerbyella sericea, I would think. It's quite a variable species.  

Edited by Tidgy's Dad
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14 minutes ago, Tidgy's Dad said:

Both Sowerbyella sericea, I would think. It's quite a variable species.  

 

 

Hmm. I would think the lighter one would be a Strophomenid, either Strophomena sp. or Rafinesquina sp. ??? :headscratch:

 

IMG_20220508_100952b_Scalbar.thumb.jpg.380a24a615f68f1d3c99f3a011079819.jpg

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  • Fossildude19 changed the title to My best guest is Sowerbyella ?

Oops.gif.a84b8228c7a32f0a50cbb1acf08ab0e7.gif

Yes. 

Thanks, Tim. 

Strophomena has a concave brachial valve and a convex pedicle valve. Rafinesquina has the reverse. 

This valve is convex and also has pointed cardinal extremities, I'm not sure if it's a brachial or pedicle valve. Maybe that's an erosion exposed part of the sealed over pedicle foramen visible at the centre of the posterior margin? (adult strophomenids don't have a pedicle opening) 

If so, it maybe Strophomena sp. with S. huronensis a possible candidate.

 

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  • Fossildude19 changed the title to My best guess is Sowerbyella ?

 

Great, not only do I get free IDs :), but you also give me great clues on how to tell the different species apart. This is exactly what I need, I always have a hard time telling brachiopods apart, because a lot of them look alike (at least for me) and I always have a hard time finding that kind of clue on the internet, and with the name that you gave me I can refine my search.

 

Thank you very much @Tidgy's Dad and @Fossildude19 for your help in identifying my little find. 

 

I will surely ask for other brachiopod identifications when time permits ;)

Edited by Denis Arcand
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