Dinogymnium cretaceum subsp. undulacostatum

"subsp. undulacostatum" (Boltenhagen, 1977, p.68–69, pl.10, figs.1a–c,2a–b,3a–b,4a–b,5a–b) Lentin and Williams, 1981, p.85.  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).  Age: Turonian–Maastrichtian.

Parent: Dinogymnium cretaceum