Backwards Gastropod?

[AJ58]

This species of Gastropod seems different than the other Ordovician Snails I have found.It appears to spiral backwards.Can someone name this species and is it common?

[Fossildude19]

Sinestral gastropods are not terribly rare, but are very cool, in my opinion.  
Where was this found? Do you know the age of the sediments? 

Possibly some species of Planorbis?

[AJ58]

This fossil was found in Northeast Arkansas .creek gravel.Lower Ordovician. 

[AJ58]

I looked at Planobis and it seems to be the right species they even talk about the backwards spiral but not the same period.

[DPS Ammonite]

Planorbis is unlikely since it is first reported from the Jurassic. Also, the shell and sediment look too hard and old to be a recent addition of a recent shell to the gravel. 

[AJ58]

I'm thanking Lecanospira compacta it looks identical and its the same period.

[b. bartron]

Straparollus (euompalus) might be a possibility. I have those amd lecanospira and I'd  lean more to the first. I could be wrong. Im not very familiar with them.

[pefty]

Very curious. The whorl cross-section does seem to be too circular for Lecanospira, and maybe even too circular for Straparollus, but I'm unaware of any other left-handed gastropod in rocks of that area/age. Presumably the "Smithville" part of the Powell Dolostone, given the preservation? Wise et al. (1975) list various gastropods in "Smithville" faunas of the area but note no left-handed forms. If Ellis Yochelson were still around, he would love to see this specimen

Wise et al. (1975) starts on p. 38 here:

https://www.geology.arkansas.gov/docs/pdf/publication/miscellaneous_pubs/MP-12-Con-Geo-Ozarks.pdf