"Giant Ramshorn" Snails
Totally unrelated to these ramshorn snails is the species Marisa cornuarietis, which is often sold at pet stores under the name "Columbian ramshorn" or "giant ramshorn" snail. This species is actually a kind of apple snail, albeit one with a planispiral shell. They are distinguished by having an operculum by which they can close themselves into their shell, two pairs of tentacles, separate genders, and a siphon on the left side.
Its shell is yellowish, with brown stripes running the length of the shell. These apple snails lay gelatinous masses of eggs on submerged portions of plants. They can grow to up to four centimeters in size. They generally will not become a pest, although they can consume large amounts of plant matter.
Read more about this topic: Ramshorn Snail
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