Pleuronautilidae Hyatt 1900

Family Pleuronautilidae Hyatt, 1900 Diagnosis Family of the superfamily Pleuronautiloidea with a commonly subquadrate or weakly depressed whorl profile; venter ranging from convex to weakly concave, ventrolateral shoulder and umbilical margin often pronounced, flanks usually weakly convergent. Sculpture with numerous ribs on the flank, sometimes with conical tubercles and more rarely with spiral ridges. An annular process is present in the advanced species (from Korn 2025). Included genera Lutonautilus gen. nov. (Permian); Pleuronautilus Mojsisovics, 1882 (Triassic); Phloioceras Hyatt, 1884 (Triassic); Anoploceras Hyatt, 1900 (Triassic); Encoiloceras Hyatt, 1900 (Triassic); Enoploceras Hyatt, 1900 (Triassic); Holconautilus Mojsisovics, 1902 (Triassic); Trachynautilus Mojsisovics, 1902 (Triassic); Sibyllonautilus Diener, 1915 (Triassic); Phaedrysmocheilus Shimansky & Erlanger, 1955 (Triassic); Arctonautilus Sobolev, 1989 (Triassic); Grumantoceras Sobolev, 1989 (Triassic). Remarks A detailed discussion of the Pleuronautilidae and families with similar morphology has been given by Korn (2025).