Help : ID this clam looking species?!

[ricosneeks]

Hello again guys! The other day when putting a rasta Zoa frag in my tank i recognised out of nowhere this weird clam looking species in the tank which i have never seen before.. can i have help identifieng what this might be and if it is good or bad, thank you as always!

 

[Reefstarter2]

Good guy filter feeders in general are

 

[Sugar Magnolia]

Could be an ark species of clam.