Paranautilus is a genus of the Nautiloid family Liroceratidae with a very involute, moderately globular, smooth shell.
The venter, at the outer rim, is arched, grading into broadly convex flanks.
Septa a close spaced, with slightly sinuous sutures.
A member of the Clydonautilaceae, Paranautilus lived during the Middle and Late Triassic (Anisian - Norian) in what is now North America, Europe, and south Asia.
Contemporary Liroceratids include Indonautilus and Sibyllonautilus.