Well, you've got a name, and presumably you've seen the weevils as well. Try www.bugguide.net and search using the latin name - if they're present anywhere in the US, that site will have a more reliable distribution map for them. They'll also have comments from various amateur and professional entomologists as to diet etc. And if all that fails, you can send an email to the site's owners, who are pro entomologists and will likely be able to point you in the right direction. You can also email them to ask about aquatic/semiaquatic domestic weevils with a prediliction for Lemna.
Best of luck!
Elizabeth (Ambato, Ecuador - incidentally, we have weevils in the Lemna here too.)
>Date: Sat, 4 Jun 2011 07:15:04 -0700 (PDT)
>From: Jason Hernandez <email@example.com>
>Subject: Re: [Aroid-l] Weevils
>To: "firstname.lastname@example.org" <email@example.com>
>Content-Type: text/plain; charset="iso-8859-1"
>Okay, I have looked into the Lemna weevils some more.? The only information I could come up with was a
>European species, exotic to the United States, named Tanysphyrus lemnae.? The USGS fact sheet on it was
>contradictory: there was a map showing the weevil in New York, Michigan, and Wisconsin, and the text
>below the map described the same range; but in the next section was a reference to its occurrence in
>Florida on water lettuce, even though the map did not show any occurrences there.? Here is the link to the
>USGS fact sheet:
>It is also mentioned on the Aquatic Insects of Alberta website, but I found?no references to its occurrence
>in South Carolina.? I did, however, find numerous references to other weevil species that feed on aquatic
>ferns, Salvinia and Azolla, but these seem to be aquatic fern specialists and I would not expect to see them
>How should I proceed?
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