Ancientia
Note that Ancientia looks externally very similar to Cornulites, but differs by having laminate walls rather than the vesicular walls of Cornulites. The higher taxonomic position of Ancientia is unknown, but is listed here with polychaetes solely because of its gross external similarity to Cornulites, which is thought to belong to the polychaeta.
Species
Ancientia ohioensis Ross, 1967
Occurrence: Waynesville
Reference: Ross, 1967
Lacks a well-defined thick laminae band along the interior side of the ring and has slightly larger imbricate rings than A. fortensis
Ancientia fortensis Ross, 1967
Occurrence: Waynesville
Reference: Ross, 1967
Known from only a single specimen
