†Plectofrondicularia grandis Keyzer 1953

Keyzer 1953. Reconsidera-tion of the so-called Oligocene fauna in the asphaltic deposits of Buton (Malay Archipelago). 2. Young Neo-gene foraminifera and calcareous algae. Leidsche Geologische Mededelingen, 17 1953: 259-292