 Like other members of the genus, "Iapetognathus fluctivagus" had ramiform (branching) array of elements (apparatus).It is believed that the ramiform apparatus in "Iapetognathus fluctivagus" evolved from the coniform (cone-like) apparatus of "Iapetonudus ibexensis".It can be readily distinguished from other conodonts existing during the same age by the sideward orientation of the major teeth-like projections (denticulate processes).