Can Turbos Ever Reproduce In A Tank?

This morning I saw something very odd in my tank - a largeish, algae-eating snail of unknown provenance. It is around the size of a large nerite, but has a more standard shell whorl, and and little ridges on its back. From what I can tell, it has a black body but a white foot (was hard to tell since it was on the back wall).

I recently (a few weeks ago) picked up some frags, but this snail seems way too large to have hitched a ride in with a few polyps. Any ideas?

Looks like a turbo to me from the shell. Could of hitched a ride if the frag was big enough... what coral was the frag?

I placed three frags into the tank at that time. One of them was a small clump of sand polyps (obviously nowhere to hide there). Another was a small rock with four mushrooms on it. The third was a clump of dead acro with a bunch of zoas attached. I went over the last frag pretty well however, and discovered a sundial snail in the process. This snail is the size of a marble, so it's hard to imagine that I missed seeing him.

They CAN, but the likelihood that one would survive is miniscule to none. Moreover, if a snail did reproduce in your tank, you'd first need parents for it, and since you say you don't have any parents, that's out. Furthermore, you'd see it grow up. These things start out life as small as a copepod, I'm sure you'd notice it over the year or so it would probably take to get that big...

Maybe I didn't make it clear, but I do have several adult turbos in my tank.

I'm leaning toward it xneaking in on a frag though, if only because it has a totally clean shell, whereas all of my other snails have at least some coraline on them.