Fact Sheet Scientific Name (Potamopyrgus antipodarum) Classification and Permitting Level 1 - Prohibited Aquatic Nuisance Species Species Description A New Zealand mudsnail is a small (up to 1/8 inch in length) gray to brown snail with 7-8 fairly equal sections (whorls) separated by deep grooves. Adults are 4-6 millimeters long. Invasive species, like the New Zealand Mud Snails, can impact local natural resources. The following are the characteristics of the mud snails found in the western United States: Color: dark … New Zealand mudsnails have opercula (singular operculum), which are ), reproduce at a high rate (20-120 embryos per brood), have an ability … The New Zealand mud snail, Potamopyrgus antipodarum, is a very small species of freshwater snail endemic to New Zealand.It is an invasive species in many countries, including the United States, where populations of this snail can reach phenomenal densities. This is an introduced species to MT with a stable or expanding distribution in the Missouri, Madison, Yellowstone, and Bighorn Rivers. Shell length is measured from the lip of the shell to the tip of the whorl. New Zealand Mud Snail Potamopyrgus antipodarum Key identifying features. Feeding Like most snails they are grazers, scraping biofilms from submerged surfaces. The New Zealand mudsnail has a wide range of environmental tolerances and has been found in nearly every freshwater habitat in New Zealand. A single snail can reproduce rapidly and colonize a new area. Adult snails are less than 1/4 inch in length. E. Identification of the NZMS New Zealand mud snails, because of their small size and similar coloration to native Colorado mollusks, take some training to identify. The New Zealand mudsnail is a tiny aquatic snail that inhabits lakes, rivers, streams, reservoirs and estuaries. New Zealand Mud Snails are extremely successful invasive species as they have a high tolerance to many different water qualities (salinity, turbidity, temperature, productivity, etc. New Zealand mudsnail are Potamopyrgus antipodarum is found in most New Zealand streams and rivers. Got a few minutes? Invasive Species - New Zealand Mud Snail. New Zealand Mudsnails are tiny snails (3-6 mm long) that have brown or black cone-shaped shells. What Is a New Zealand Mud Snail? As they reproduce quickly and mass in high densities, there is concern they will impact native invertebrates and the food chain of Oregon’s native trout and degrade steam water quality, with … New Zealand mud snails have five or six whorls and generally are light to dark brown, but can appear black in color, especially when wet. One of the main identification features of the New Zealand mudsnail is their size. It is generally dark brown to grey in color. Learn how to identify the New Zealand Mud Snail, an aquatic invasive species. Indicator value High population densities are an … New Zealand Mud Snail (Potomopyrgus antipodarum). It is a primary consumer that grazes on algae and is native New Zealand. Generally self-reproducing by cloning. Adult native snails are larger than the New Zealand mudsnail adults. new zealand mudsnails mud snail identification guide king county nzms thornton soos mill kelsey mercer creek fresh water freshwater native invasive Created Date 6/20/2013 1:24:54 PM The New Zealand mudsnail is a small, operculate (trapdoor) snail that gives birth to live young. In addition to mud, the snail can also be found lurking on rock or gravel surfaces, aquatic vegetation, or woody debris. Learn how to identify the New Zealand Mud Snail, an aquatic invasive species. New Zealand Mudsnail (NZMS) is a small snail (4-6 mm) with a dextral (right-handed coiling), elongated shell with 5-6 whorls separated by deep grooves. P. estuarinus is restricted to sites with tidal influence.