Najas minor - newest invasive to area; found at Lake Arrowhead late August 2020.  Also known as European, Brittle or Spiny naiad.  (Naiads are also known as waternymph)

Click here to view photos and details provided by LACC (Lake Arrowhead Conservation Council).

Please note that the areas on Arrowhead where the naiad was found is adjacent to one of the boat ramps, and actually in Limerick...