Brachionus leydigii is a species of rotifer with a reported distribution across the Eastern Hemisphere and additional scattered reports from the Western Hemisphere. B. leydigii is able to tolerate a wide range of temperature and salinity conditions, appearing in both marine and freshwater environments. Transoceanic shipping is the most likely pathway of introduction, but no introductions of this species have been explicitly documented and therefore impacts of introduction are unknown. Climate match to the contiguous U.S. is high. Overall risk posed by B. leydigii is “Uncertain.”
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.
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Uncertain Risk
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