Are these sundial snails?

[Fishbulb2]

Hi all,

I have some snails in my tank that I'm now worried about. I currently have no zoas in the tank but I do have a shipment of some currently on the way. These snails came in a cleaner package from a sponsor here so I couldn't imagine they would be sundial snails. But they do look really similar.
Here are some pictures and I'd love any input.

I think they were likely sold to me as Nerite snails but have my doubts.

Thanks guys,
FB

 

[zoafarm]

Not sundial snails...look like nerite snails IMO.

 

[SushiGirl]

Need a pic of the entire snail not blocked by rock. Pull one out, put it on something white & shoot the top, bottom, and side. Could be either Nerite or Sundial. Sundials look like spirals, and are very narrow. I can't tell the overall shape of the one in your tank.

 

[650-IS350]

http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=424
sundials

other predators
http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=384

 

[Fishbulb2]

Thanks guys. The pattern on these guys REALLY looks like a sundial snail but it is not narrow at all. These are quite round and spherical if you will. One questions I had is, are sundial snails obligate zoavores (wow that's time I've used that word). Specifically, could they survive for 3-4 months in an aquarium with zero zoanthids? I'm sure the zoanthid eating nudibranchs could not for example.

Thanks again,
FB

 

[Fishbulb2]

Thanks for the cool links. I did not know about this site.

http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=424
sundials

other predators
http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=384

 

[650-IS350]

you cant tell its sundial by the pyramid type looking closing flap

 

[KafudaFish]

Also the color pattern is different in your snail vs. sundial snails.

In your first picture the black marking pretty much runs the entire width of the shell, the whirls, but in sundials the pattern is broken.

 

[Fishbulb2]

Thanks for the help everyone. I'm more and more convinced these are not sundial snails.

FB

 

[slin1977]

Mate, i think you are safe , these are not the helicus snail known for destroying zoas. At worst the snail pictured will knock over your frags. I do think the first one pictured is touch and go , would it be worth, for your peace of mind to remove it?