1) Cretaceous ammonite
Found on
https://www.crosswordclues.com/clue/protaconeceras
Protaconeceras is a deeply umbliciate, involute haploceratacean ammonite from the Lower Cretaceous included in the oppeliid subfamily Aconeceratinae. The shell of Protaconeceras has a crunulate keel, especially in the youth. Sides are slightly convex and are covered with flexious striae or flattened ribs that extend onto the ventral surface. Sutur...
Found on
http://en.wikipedia.org/wiki/Protaconeceras
No exact match found.
