Hitchhiker on Turbo snail

[Snotman]

Sounds a bit strange to me but I have a large Turbo snail (about 1.5" across) and it has a small (about 7mm across) turbo snail shaped hitchhicker attached to its shell. Every now and then the hitchhiking shell angles up and a long necked jet black snail protrudes and has a munch on some nearby surface!

It never ever moves and seems happy to be carried about like a limpet.

No digital camera at the moment sorry.....Any idea's.

 

[austinsdad]

like a limpet

That was my first guess about what it is.

 

[Devilishturtles]

Or a black stomatella?

http://www.melevsreef.com/id/snails.html

It's the middle picture in the second row down. Click on it, and a window pops up for more info.

Here's another picture.

http://www.nano-reef.com/gallery/showphoto.php?photo=1466&size=medium&sort=1