Large white lump on trochus snail

[Allybug903]

0C4186B5-F843-4C07-B072-5C220866B180

• Allybug903
• Aug 22, 2018

C0909252-00BC-4C24-996A-AADC8B68FF89

• Allybug903
• Aug 22, 2018

3E91E6F0-D56D-4751-889E-AD77B6C27F14

• Allybug903
• Aug 22, 2018

I was hoping someone could recognize the large white lump on the snail shell. I can’t find any pictures like it online

 

[saltyfilmfolks]

Could be a bivalve or another snail.
Hitchhiker basically would be my guess.

 

[rstrann]

I agree with Salty. Looks like a limpet to me. No worries.

 

[Maritimer]

Possibly a slipper-shell. No danger.

~Bruce

 

[kirstyflash]

This is my trochus Mammoth. His base is approx 2” diameter. He has a clam on a clam on his shell...no I didn’t just repeat myself. There is one clam on the shell of the other who is on Mammoth. Snailception it has been called by other reefers. He also has several slipper limpets on him also, as well as several different types of coraline and sponge. They are just filter feeders and cause no issue at all.