Amphidromus niasensis is a species of air-breathing tree snail, an arboreal gastropod mollusk in the family Camaenidae.
Description Amphidromus cognatus is large, with a shell length ranging from and a diameter of .
(Original description) The sinistral shell is moderately thin and finely obliquely striated. The protoconch is semitransparent and waxy. The teleoconch has a light reddish base ornamented by moderately broad oblique stripes, bisected medially by a narrow spiral band of a paler hue. The base of the body whorl exhibits a moderately broad dark brown band just below the periphery and a narrower dark brown band further ventrally, separated by a yellow band. The umbilical region is reddish. The shell contains six convex whorls, increasing rather slowly. The aperture displays external markings internally. The peristome is slightly expanded and is flesh-colored. The columella is vertical, flesh-colored, rounded and slightly expanded at its insertion. Fulton, H. C. (1907). Descriptions of new species of Trochomorpha, Cochlostyla, Amphidromus, Bulimulus, Drymæus, Placostylus, Stenogyra, Leptopoma, Cyclophorus, Cyclotus, and Alycæus. Annals and Magazine of Natural History, Series 7. 19(110): 149-157
Distribution Amphidromus niasensis was found on Nias Island, off the werst coast of Sumatra.
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