Editing Seashell (section)

==== Non-marine "seashells" ====
[[File:Shells01.jpg|thumb|A group of purchased (mostly marine) shells includes the shell of a large tropical land snail (upper right), and a shiny freshwater apple snail shell (center)]]

The term ''seashell'' is also applied loosely to mollusk shells that are not of marine origin, for example by people walking the shores of lakes and rivers using the term for the [[freshwater mollusc|freshwater mollusk]] shells they encounter.  Seashells purchased from tourist shops or dealers may include various freshwater and terrestrial shells as well.  Non-marine items offered may include large and colorful tropical [[snail|land snail]] shells, freshwater [[apple snail]] shells, and pearly freshwater [[unionid mussel]] shells.  This can be confusing to collectors, as non-marine shells are often not included in their reference books.