Dinogymnium cretaceum var. undulacostatum Boltenhagen, 1977

Name not validly published.
Originally Dinogymnium cretaceum var. undulacostatum (name not validly published), subsequently Dinogymnium cretaceum ssp. undulacostatum (combination not validly published).

Boltenhagen, 1977, did not appear to designate a holotype.
Holotype: not designated
Age: Turonian-Maastrichtian