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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