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Potamopyrgus antipodarum
Image courtesy of U.S. Fish & Wildlife Service - Pacific Region through Wikimedia Commons and the CC BY 2.0 License
Potamopyrgus antipodarum
Taxonomic Group: Mollusks-Gastropods


Potamopyrgus antipodarum is commonly known as the New Zealand Mud Snail. It is small in size (4-6 mm) and primarily occurs in freshwater, but can also tolerate brackish to near-marine salinities in estuaries. It is native to New Zealand and has been introduced to North America, Europe, Australia, Japan and Iraq. It inhabits streams, springs, ponds, lakes and estuaries. New Zealand Mud Snails have been transported by a wide range of vectors, including ships’ drinking water barrels, hull fouling on boats and ships, ballast water, fishing gear, birds, and fish. In its introduced range it can spread rapidly and can reach very high densities, competing with native invertebrates, altering food webs, and affecting sport and commercial fisheries.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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