Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

Pila scutata is an amphibious freshwater snail native to Southeast Asia, although the exact extent of its native range is uncertain. This species has been introduced outside of its native range due to its use as a food source, a domestic aquarium snail, for biocontrol of other snails that act as vectors of the parasites causing schistosomiasis, and for control of aquatic weeds. It is established in Hawaii on the island of Oahu but has not been reported from the continental United States. The genus Pila is reportedly a vector of human parasites and a minor crop pest, but there is no information specific to Pila scutata causing disease or crop damage. Further, there is no information available on impacts of its introduction to ecosystems. P. scutata has a low climate match with the contiguous United States. Further information is needed to determine what impacts, if any, this species has where introduced. Certainty of this assessment is therefore low, and the overall risk assessment category is Uncertain.