Somehow, never considered morphology on a snail being right or left,  irrelevant, not to pay attention.  Thought there were both kinds of it,  randomly.  A publication says the lefty species is a rarity. 

"The lefty is the right one" :

https://phys.org/news/2009-11-rightleft-handedness-snails-lab.html

Quote

Snail shell spirals are often used as examples of chirality. The direction of the spiral is important because the sexual organs are twisted, which makes it difficult for snails to mate unless their handedness matches.

 

15 minutes ago, Phi for All said:

https://phys.org/news/2009-11-rightleft-handedness-snails-lab.html

 

Interesting.