20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed Origin or pseudonym: Taza

Origin or pseudonym: Taza

It can be seen how part of its thin outer layer (the enamel) has lost by erosion and has exposed the underlying layer of dentine

Feruminops

Next you can find a link to the scientific paper: Zarafasaura Oceanis

20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed Origin or pseudonym: TazaCleoniceras sp, Parona and Bonarelli 1897 (ammonite) Cephalopoda Ammonitida Cleoniceratidae Cleoniceras is a rather involute, high whorled hoplitid from the Lower to basal Middle Albian of Europe, Madagascar, and Transcaspian region. The shell has a generally small umbilicus, arched to acute venter, and typically at some growth stage, falcoid ribs that spring in pairs from umbilical tubercles, usually disappearing on the outer whorls. These ammonites