Pdf: http://rogov.zwz.ru/Sassarolli,Venturi,2010_Cingolites.pdf

New biostratigraphic data are provided from the Marchean Apennines (Marconessa quarry, near Cingoli, Macerata, Italy) where a lower Jurassic outcrop yielded a remakable Toarcian ammonite assemblage, very rich in early Hildoceratinae (Ammonitina). The site is historically meaningful, because in the past two centuries Italian palaeontologists have figured ammonoid specimens from "Marconessa ". Here, the nodular limestone and grey marl of the Bugarone Formation have recorded a great amount of well preserved Toarcian inner moulds of ammonoids sometimes large sized. From the lower and middle Toarcian layers of the Marconessa quarry sections we collected several ammonite genera, such as Hildaites, Orthildaites, Hildoceras, Harpoceras, Taffertia, Rakusites, Martanites, Praemercaticeras, Mercaticeras, Leukadiella, Frechiella, Phymatoceras, Rarenodia, Praepolyplectus, Polyplectus, Orthodactylites, Mesodactylites, Nodicoeloceras, very rare Dactylioceras and Nejdia, Lytoceras, Calliphylloceras, Phylloceras. We establish herein a new genus Cingolites, to which we ascribe three new species (C. clavatus, C. picenus and C. spiralis) and an already established species (C. stefaniniij, which was previously assigned by Merla (1932) to the genus Mercaticeras. To the present-day the genus Cingolites seems to have a Mediterranean Tethys dispersal, mainly in the Apennines, where it occurs with other endemic Hildoceratinae fauna. These ammonite assemblages found in our Apennines sections seem to show a certain amount of provincialism that affected some Hildoceratinae lineages of the lower Toarcian.