Planorboid
From The Aquarium Wiki
Planorbid refers to snail shells, if a snail's shell is Planorbid the spine is not elevated above the body whorls, making the shell appear flat. This can mainly be applied to Ramshorn Snails.
Planorbid refers to snail shells, if a snail's shell is Planorbid the spine is not elevated above the body whorls, making the shell appear flat. This can mainly be applied to Ramshorn Snails.