Micromollusk
![Numerous shells of the freshwater snail Potamopyrgus antipodarum compared to an American dime, which is 18 mm in diameter](/Images/godic/202501/27/Mudsnail25231.jpg")
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![Shells of some micromollusks: from left, Truncatella bahamensis (holotype), Truncatella bilabiata bilabiata, Truncatella pulchella.[1]](/Images/godic/202501/27/CaribbeanTruncatella19705231.jpg")
![The Bailey-Matthews National Shell Museum exhibit about micromollusks shows some species from Sanibel, Florida](/Images/godic/202501/27/BMNSM_micromollusks5231.jpg")
A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also reach adult size at very small dimensions.