Yes indeed, for this ancient and highly evolved organism, left-handed shell coiling provides a clear survival advantage, rendering these highly fit individuals immune to attacks from inferior right-handed crabs. As the authors of this excellent study point out, the physical superiority of lefty snails parallels the well-established superiority of left-handed humans in physical competitions:
"This advantage parallels some social interactions in human cultures that result when right and left-handed individuals compete, especially in sports or fights involving dual confrontations (interactive contests such as boxing, tennis, fencing and baseball), where left-handers occasionally enjoy an advantage over their right-handed opponents."
Clearly then, left-handedness confers not only intellectual, but also physical superiority to a diverse range of multi-cellular organisms across phylogenetic taxa.
Further reading on the superiority of left-handedness in the human:
- Do left-handed competitors have an innate superiority in sports? Grouios et al., Percept Motor Skills, 2000.
- Handedness, homicide and negative frequency-dependent selection. Faurie and Raymond, Proceeding of the Royal Society B, 2005.