well it might die. im not gonna lie to ya. just leave it alone, and see what happens. im not a clam expert. but from past experience, i tore my clams foot when moving it from a 15 to the 55. it lived a year and a half after that before (i went on vacation) it died.
ah. um... idk then. mine was a deresa clam. (dont even ask why i had one... lol). deresas are i think the easiest, followed by crocea, then squammys and maximas. idk tho.
Its a crocea. Mine loves the sand, and if its on the rocks it tosses itself off. Are you sure its the foot it lost and not the byssal threads? Google for a pic.
If you pulled the clam out and the foot ripped, the clam probably wont make it. If it ditched em itself, then no worries.