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The Discovery of the rare species of snail, Discus patulus, occurred in 1817 by Thomas Say, he
studied this species and observed its characteristics and described it to belong to the species
Helix perspectiva (
However, Say was not aware that the specific name perspectiva
was already in use for another snail, so scientist Deshayes re-named it Helix patula in 1830.

Discus patulus©UW La Crosse