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National Invasive Species Information Center
U.S. Department of Agriculture
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Invasive Species Not Established in U.S.

Provides examples of Invasive Species Not Established in U.S.Established species are species having a self-sustaining and reproducing population in a specified geographic area without the need for human intervention. Applies to both native and non-native species.
Source: Invasive Species Terminology: Standardizing for Stakeholder Education [clemson.edu; The Journal of Extension]

These species of concern are why we must increase our efforts in early detection and rapid response (EDRR) and the prevention of new introductions.

See also: Pests not known to occur in the United States or of limited distribution [invasive.org]