Permonautilidae Barskov & Shilovsky 2014

Family Permonautilidae Barskov & Shilovsky, 2014 Diagnosis Family of the superfamily Liroceratoidea with a pachyconic or globular, usually subinvolute to subevolute conch. Whorl profile in the adult stage usually more or less strongly depressed; flanks and venter form a continuous arch in the early forms, the venter can be flattened or concave in advanced forms. Terminal aperture with long lateral shell processes emerging from the umbilical margin. Ornament consisting of fine or coarse growth lines. Septum simple in shape, concavely domed; suture line very simple, almost straight across flanks and venter or with small lobes and saddles (from Korn 2025). Included genera Permonautilus Kruglov, 1933 (Permian); Alexandronautilus Shimansky, 1962 (Permian) [synonym of Permonautilus Kruglov, 1933]. Remarks A detailed discussion of the family Permonautilidae has been given by Korn (2025).