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Weevils



Yesterday I was exploring a pond in which 100% of the surface was covered with Lemna sp. (I rarely bother to identify Lemnoidea to species).  At the lower end, near the dam, there was also Wolffia sp.  These two aroids formed such a solid layer that insects could treat it as dry land -- I actually watched a Pompillid wasp drag a paralyzed spider across the Lemna carpet.  Looking closer, I saw that many of the Lemna fronds had circular or oval holes eaten in them.  I also noticed some tiny weevils -- each one smaller than a Lemna frond -- walking about, and I presume these were the perpetrators of the herbivory.  Has anyone studied these Lemna-eating weevils?  This was in the Inner Coastal Plain of South Carolina, if that helps.
 
Jason Hernandez
Naturalist-at-Large
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