new snail

[Gti_Leo]

i just bought a new trochus snail to replace one that had passed away last week, and when i put it in my aquarium i noticed some thing on its shell



looks liek a little spider type thing on it with an eye in the middle, just wonderign if i should take the snail out and keep it in a quarentine tank just incase its a parasite or a spider, there are 4 on it by the looks of it.

 

[Gti_Leo]

they looked to have moved to another place on the shell so i removed the snail and put it in the bucket of acclimated water, goign to place it in a little 1 gallon goldfish bowl my sister has, but i'd like to know if i should worry about these or not