Dinogymnium cretaceum ssp. undulacostatum (Boltenhagen, 1977) Lentin and Williams, 1981

Combination not validly published: holotype not designated.
Originally Dinogymnium cretaceum var. undulacostatum (name not validly published), subsequently Dinogymnium cretaceum subsp. undulacostatum (combination not validly published).

Holotype: not designated
Age: Turonian-Maastrichtian