Inoperna bivalve? South Central Texas

[Jiesen]

I found this odd fossil jutting out of a weathered large landscaping stone, probably locally quarried from just north of San Antonio, TX. House key for scale. I'm thinking Inoperna? That same stone has lots of worm tubes and other little conglomerated bivalves. Thanks for any input!

[Fossildude19]

I think more would need to be exposed to make any kind of determination about this.
Does look like a bivalve of some sort, though.

[Jiesen]

4 hours ago, Fossildude19 said:

I think more would need to be exposed to make any kind of determination about this.
Does look like a bivalve of some sort, though.

Thank you for the feedback!

[ClearLake]

I agree more of it exposed would help to make an ID more reliable.  Also a picture looking straight down on it if possible might help, these all seem to be at an angle. 

 

That said, I would not rule out the gastropod Nerinea as I think I see several regularly spaced slightly oblique segments along the length.  These are very common in the Cretaceous rocks of central Texas and are tall and slender with only a slight taper.  See the picture below for a couple of examples (scale in cm), although yours appears to still have shell material attached to it.

 

 

 

[Jiesen]

10 hours ago, ClearLake said:

a picture looking straight down on it if possible might help

 

Hopefully these will help. The 3-dimensional jutting-out effect of the right-hand piece is hard to capture. I'm wondering if these two remnants are part of the same organism? Thanks

 

[Jiesen]

Whoops. Ignore those last two. Different fossils. 

[ClearLake]

11 hours ago, Jiesen said:

Hopefully these will help.

Hmmmm, I'll stick with my idea, but I'm not positive at all.