20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed about 515-520 Ma ago) of

about 515-520 Ma ago) of Laurentia and are among the oldest known fossils of echinoderms

Upper Cretaceous)

finding the structure of the jaw with teeth in its natural position is extremely rare

Parent taxon: Acastidae according to B

vanadinite crystals from Midelt

20868 - Nice Agatized & Polished 3.96 Inch Cleoniceras sp Lower Cretaceous Ammonite Madagascar Mosasaur pathologically deformed about 515-520 Ma ago) ofCleoniceras 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