Gastropods of the Stone City formation, Eocene, Texas

[SharkySarah]

I was lucky enough to pick through some matrix that’s super fossilferous, thanks @JamieLynn

 

gastropods are one thing I struggle with some much when it comes to ID. I’ve put my guesses down below but would appreciate any help anyone can offer. Thanks in advance! 
 

1. Botis enterogramma or Paeudoliva vetusta 

 

2. Bonellitia paritis

 

3. Architectonica elaborate 

 

4. A. bellisttiata 

 

5 and 6. Not sure 

 

7. Meselia claorborneensis

 

8. Terebra texana

 

9. Hastula houstonia 

 

10. Turritella nasuta

 

11. No ID? 

 

12.Hesperiturris? 

 

13. Eosurcula moorei

 

14. I really can’t tell any like this apart. 

15. Ancilla staminea

 

 

16. Too broken ? 

 

17. Conus tortilis

 

18. Not sure. 

 

19. Buccitriton trxanum 

 

20. Ficopsis nucleoides

 

[SharkySarah]

I really don’t like 21-27 cause the more I look at these the more I get confused. 
 

 

  

[Tidgy's Dad]

Nice variety of lovely little snails.

And most generous of @JamieLynntoo!

[Thomas.Dodson]

1. Pseudoliva vetusta.

 

2. These are a Buccitriton. Check for the inner lip denticles for differentiating B. sagenum and B. texanum. Bonellitia are more cancellate and the ribs are more curved.

 

3. Could be. I tend to use multiple angles/features to ID architectonica because sculpture is often different across age groups. Take some more pictures of it.

 

4. Could we see the reverse side? I'm not sure this is Architectonica at all. At the very least, A. bellistriata has wider spiral grooves and stronger dashes across the shell surface.

 

6. Reminds me of a worn foraminiferan.

 

7. These are Turritella, not Mesalia. Don't remember the species off hand.

 

8. This is Eulima, I'd guess Eulima extremis from the locality. Terebra will never be smooth/porcelainous and have a diifferent aperture.

 

9. Correct.

 

10. Looks like 2 species here. Again, don't remember all the Turritella from here without looking back.

 

11. Probably same as 8.

 

12. Some of these look like Coronia.

 

15. Ancilla staminea punctulifera.

 

16. Looks closer to a broken modern land snail. Not sure.

 

17. Some Conus at any rate.

 

18. Some juvenile probably. They can be very difficult when young.

 

19. Can't see the denticles but are you sure it isn't B. sagenum?

 

20. Not sure.

 

Out of time for now to look in depth at post 2 but 23 C is your Bonellitia parilis.

[SharkySarah]

@Thomas.Dodson thank you for your help. As requested here are more angles 

 

3

 

4. 

[ClearLake]

It looks like @Thomas.Dodson has done a great job and answered most of your questions.  I'll just add a couple of additions/clarifications.

3. With the new pictures, could be A. scrobiculata, but I'm not 100% convinced.

4. Definitely not an Architectonica.  I think it may be one of the Pteropods, like Limacina

5. Could be a small, broken Architectonica, would have to see more angles.

7. Definitely Turritella, but determining species on these is a nightmare in my opinion.  Too many and too much overlap.  T. nasuta might be the best choice, but don't take that to the bank.

12. Yes, two end ones look more like Coronia

14. Its all about the pattern of spiral lines.  There are several different ones in here

17. Probably too worn to go beyond genus

20. I would probably call that an Athleta

21.  Pretty beat up to be too sure

22A Distorsio septemdentata

22B and 23A look like an Athleta

22C looks like a Ficopsis

24A,B,D, E all are juveniles of either Cochlespira bella or cf Ancistrosyrinx bastropensis.  I have tons of those but have never figured out how to tell them apart.

25A, B, E all all juveniles of one of the more common ones I think, I just can't remember which

26 all but not D. Are juveniles of either Cochlespira bella or cf Ancistrosyrinx bastropensis.

 

Hope this helps.  I use the Emerson (2001) book a lot to get started and then have referenced a bunch of the older literature on some of the confusing ones (and often just get further confused lol).

[SharkySarah]

@ClearLake here are more of 5 

[ClearLake]

4 hours ago, SharkySarah said:

 here are more of 5 

That is an Architectonica for sure. Probably A. scrobiculata is my guess. 

[SharkySarah]

@ClearLakethanks!!!