Why do sea snails build their shells in a clockwise direction?

I have shells that all rotate in a clockwise fashion and i want to know why. why dont they rotate in a counterclockwise fashion

Why do sea snails build their shells in a clockwise direction?
As the sea snail grows larger each time they build a larger chamber to live in. The chambers grow in a clockwise or counterclockwise fashion due to fractals - the smaller chambers are exactly like the larger chambers in design. They grow in that shape because that is how their evolution turned out. These things usually arise because they have an evolutionary advantage for being. It may be because it makes it easier to balance the shell than if the shell just grew straight backwards or it may just be that the female of the species evolved to like that shape. No one knows for sure the exact reason why.
Reply:.......DNA silly............. Report It
Reply:They're superstitious.
Reply:It all depends on which side or which end you look at them from. Their genetics define the way they make them.
Reply:It isn't known exactly why the shells rotate clockwise but an interesting discovery was made from studying core samples that the average water temperature affects which direction the shells coil. As water becomes warmer or cooler, the shells with change from clockwise to counterclockwise. The direction of coiling has been used to track global warming and cooling trends as well as glacial and inter-glacial periods (ice ages).
Reply:It's a torsion thing--a long, long time ago the hypothetical ancestral mollusc evolved torsion, and that is just the way the shell happened to end up coiling.



Evolution of counterclockwise coiling, also known as left-handedness or sinistrality, has evolved independently in several lineages over time; however, left-handed snails can't breed with right-handed snails so unless the mutation for left handedness occurs simultaneously in a large population of snails, and the lefties find each other, it can't take hold.
Reply:Because they all wear Rolex Oyster perpetual motion watches
Reply:Maybe its because it is a forward motion type of thing.
Reply:The answer is unknown (probably the ancestral torsioned molluscs just started that way, and their offspring had that direction built into their DNA).



However, they don't have to: some shells grow in the opposite direction, even within a single species. There isn't any physical or other reason for the shells to grow clockwise. By the way, the torsion (twisting) of the shell is also manifested within the anatomy of the critter that makes the shell. Also, hermit crabs have anatomy (just an external twisting) that makes it much more convenient to use normal shells for protection.