Comal County, Texas Unknown Gastropod

[Breeze]

Howdy. I found this gastropod in Comal County, Upper Glen Rose formation, and I'm drawing a blank. I'm unable to find any sources that show or describe a species with this ribbed morphology.

 

Any help is greatly appreciated!

 

[Fossildude19]

Maybe something like Turrilites sp.? 

 

Let's ask some locals:

 

@JohnJ  @Uncle Siphuncle  @erose

[grandpa]

Check out heteromorph ammonites.  I think you will find your ID there.

[erose]

Sorry Gramps, no heteromorphs like that in the Glen Rose that I know of. Not Turrelites either.

 

I am pretty sure it is of the gastropod genus Purpuroidea.  There are two species, both GR, listed in the HGMS gastropod book (Akers & Akers, 1997).  It appears to be closer to Purpuroidea krehanus Whitney, 1937.  The description in Whitney also seems to jive.

 

Nice specimen!

 

PS with snails an image of the aperture is often part of the diagnosis and would have helped.

 

 

[Breeze]

Thank you all for the info and tips!