20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed Upper Cretaceous)

Upper Cretaceous)

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

Parent taxon: Acastidae according to B

Feruminops

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

20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed Upper Cretaceous)Cleoniceras 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