On the systematic position and phylogenetic significance of Anglonautilus sinuatoplicatus (GEwswrz, 1843) from the Coniacian (Upper Cretaceous) of Central Europe

An enigmatic and rare Late Cretaceous nautilid species, described as Nautilus sinuato- plicatus by GEINITZ (1843) from the Coniacian of the Inner Sudetic Cretaceous of southern Poland, is taxonomically revised and placed in an evolutionary framework. Based on its conspicuous sculpture with distinct ventral undulations and the trapezoidal whorl cross-section with a flattened venter, the species is assigned to the genus Anglonautilus SPATH, 1927 that first appeared in the early Hauterivi-an. In the following, there is an almost continuous stratigraphic record of Anglonautilus species from the Hauterivian to the middle Cenomanian. After a conspicuous >15-myr -long stratigraphic gap in the record from the late Cenomanian to early Campanian, the range of the genus was concluded in the early Maastrichtian. Thus, Anglonautilus sinuatoplicatus (GEIMTZ, 1843) fills a crucial gap in the Late Cretaceous evolutionary lineage of the genus Anglonautilus. The few known specimens of A. sinuatoplicatus all come from Coniacian deposits which accumulated on the warm-temperate shal-low shelf north of the Mid-European Island, seemingly representing a mid- Late Cretaceous endemic center of nautilid evolution.