Please help ID this Travis County bivalve!

[Nuna]

Looking for species ID on this Neithea bivalve. Found this in Travis County in Williamson Creek gravel bed (Qt). 

[fifbrindacier]

Neithea irregularis ?

http://www.library.utexas.edu/geo/ggtc/figs/fig.11.gif

http://www.thefossilforum.com/index.php?/topic/19294-neithea-found-in-central-texas/

[grandpa]

If you could, please provide a photo of the opposite side as well.  The lack of a prominent "ear" combined with the prominence of radial ribs leads me to consider N whitneyi (Kniker, 1918, Buda fm.) as a possibility; although if so, it would be a big specimen.

[JohnJ]

To me, it looks like a very tumbled Neithea wrighti (Shumard).  They typically originate in the Georgetown formation in Central Texas.

 

[Nuna]

23 hours ago, JohnJ said:

To me, it looks like a very tumbled Neithea wrighti (Shumard).  They typically originate in the Georgetown formation in Central Texas.

 

 

This is the one! Thank you very much. 

[fifbrindacier]

7 hours ago, Nuna said:

This is the one! Thank you very much. 

I agree, this is the one.