Assiminea subcylindrica is a species of small operculate snail, a marine gastropod mollusk or micromollusk in the family Assimineidae. It was described by Ilse Rensch from a specimen found in New Ireland Province, Papua New Guinea.
References
Further reading Rensch, I. (1937). Systematische und tiergeographische Untersuchungen über die Landschneckenfauna des Bismarck-Archipels II. Archiv für Naturgeschichte, Neue Folgen. 6: 526-644.