Amerianna obiana is a species of freshwater snail in the family Planorbidae. It is found on the island of Obi in Indonesia.
Taxonomy Amerianna obiana was first described by Hermann Rolle in 1903 as Ameria obiana.
Two syntypes are known, with one being located at the Museum für Naturkunde in Berlin, and the other at the Zoological Museum in Amsterdam.
Description Amerianna obiana has an oval-shaped shell that measures in height by in diameter. The shell is left-curling (sinistral). There are 4.5 convex whorls, or shell revolutions, which form a structure called a spire that sticks up slightly. The aperture (shell opening) is oblong, and measures .
Distribution Amerianna obiana is known to inhabit the island of Obi in Indonesia.
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