Hercoglossidae

Hercoglossidae was established by Spath in 1927 for smooth, involute nautiloids characterized by a suture with differentiated elements, known from the Upper Jurassic to the Oligocene. Hercoglossids make up part of the Nautilid superfamily Nautilaceae. ( 1964) Four genera are described in the Treatise ( 1964). They are Hercoglossa, Aturoidea, Cimonia, and Deltoidonatilus. All have a whorl section that is generally rounded, except for Deltoidonatilus where in it is triangular in outline. Sutural complexity increases from Cimonia to Hercoglossa and to Aturoidea. The suture in Deltoidonautilus is like than in Hercoglossa. (ibid)