Zygolithus bijugatus Deflandre in Deflandre & Fert, 1954 validated by Deflandre, 1959; permissible in ICZN, code use by Deflandre.
Pseudozygrhablithus Haq, 1971
Deflandre, G. & Fert, C. 1954. Observations on current and fossil coccolithophorids in ordinary and electron microscopy. Annales de Paléontologie 40: 115-176.
Deflandre, G. 1959. Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie 2: 127-152.
Haq, B. U. 1971. Paleogene calcareous nannoflora. Parts I-IV. Stockholm Contributions in Geology 25: 1-158.