id clam like hitchhiker on snail

[starfire2116]

I I have two clam like hitchhikers on one of my snails. I thought it was a piece of super glue at 1st. But today I noticed them opening and closing when a fish got close to the snail. And they have balck lines on them. you csn see them in the pictures.
What is it and is it dangerous?

 

[starfire2116]

They are kinda cute and fun to watch.

 

[king aiptasia]

placunidae

 

[king aiptasia]

placunidae

a harmless oyster

 

[starfire2116]

placunidae

Do they have black lines on them by chance?

 

[king aiptasia]

touch it, is it firm and shelly or soft?

 

[starfire2116]

touch it, is it firm and shelly or soft?

Shelly and firm. Not soft

 

[Reefer Reboot]

I think it's more likely a Jingle Shell (Anomiidae) as they attach to other shells or hard surfaces. Placunidae are mud dwellers.

 

[starfire2116]

I think it's more likely a Jingle Shell (Anomiidae) as they attach to other shells or hard surfaces. Placunidae are mud dwellers.

Either way, should I be worried about them spreading all over the tank. Or am i ok with leaving them in there on the snail.

 

[Reefer Reboot]

They're okay, won't hurt anything but probably won't last long either.

 

[king aiptasia]

I think it's more likely a Jingle Shell (Anomiidae) as they attach to other shells or hard surfaces. Placunidae are mud dwellers.

i forgot about that detail

 

[starfire2116]

They're okay, won't hurt anything but probably won't last long either.

so just a new experience and viewing entertainment.
Thanks for helping everyone.
I Will enjoy.