Dear Blue;-
   Is Marisa c. there in any great numbers? And how do they "escape" into any headwaters? Are the larva carried in fish gills as are many species of mollusks in Kentucky waters?
    Art
>
> From: blue cameron <[log in to unmask]>
> Date: 2004/02/15 Sun AM 01:31:26 EST
> To: [log in to unmask]
> Subject: Marisa and ramshorns
>
> Marisa cornuarietis has escaped into the headwaters springs of the Comal and
> San Marcos Rivers, Texas, which contain endangered endemic fish, plants and
> invertebrates. The Comal also has endemic snails (Elimia comalensis) which
> may be at risk from Marisa and two other invasive snails -- Melanoides
> tuberculatus and Tarebia granifera (both commonly sold in the aquarium trade
> as "Malaysian Trumpet Snails"). I have also taken specimens of another
> "Ramshorn" Snail in the aquarium trade here -- Helisoma anceps, which is
> native in Texas and may be an end result of local breeders taking advantage
> of local ponds. P. (or H.) trivolvis is also native and about equally as
> common.
>
> blue
> austin, tx
>
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