(Myxobolus shekel) is no more than 8.5 um when fully grown, making it the smallest known animal.

Molluscs (Mollusca)

Bivalvia

The shell of the nut clam Condylonucula maya grows 0.54 mm long.

Gastropods (Gastropoda)

The smallest water snail (of all snails) is Ammonicera minortalis in North America, originally described from Cuba. It measures 0.32 to 0.46 mm.

The smallest