Aquariums: is this a freshwater limpet?

i bought some used black aquarium sand off of marketplace. this guy's tank was established pretty well, but i've never seen this little thing before! is it a freshwater limpet, a very very small bladder snail, or something else?

i've found bladder snails, tiny white worms, little jumping daphnia or cephalopods? and mini ramshorns so far. i didn't know the sand came with pest snails, but no big deal!! i have assassin snails in 2/3 of my other tanks. this is only a nano 3 gallon i'm using for fun! no fish, shrimp or other inhabitants so far.