Zygrhablithus bijugatus

Zygolithus bijugatus Deflandre in Deflandre & Fert, 1954 [Invalid ICN Art. 35.1] but valid according to ICZN.

Zygrhablithus bijugatus (Deflandre in Deflandre & Fert, 1954) Deflandre, 1959

Sujkowskiella enigmatica Hay et al.1966

Pseudozygrhablithus altus Haq, 1971

Pseudozygrhablithus latus Haq, 1971

Semihololithus kerabyi Perch-Nielsen, 1971

Rhabdolithus costatus Deflandre in Deflandre & Fert, (1954) = Zygrhablithus bijugatus maximus Bown (2010); having a large distal process

Zygrhablithus bijugatus crassus Locker (1967a); having a short, truncated distal process

Zygrhablithus bijugatus cornutus Bown (2005d); having short lateral protrusions or horns at its distal end

Medium to large spinose holococcolith having a proximal base and a distal process. The distal process has four quadrants divided by X-shape septa [can be seen in plan view] and tapering uniformly to blunt termination.

The base has a large cavity that opens proximally, whilst the distal process has a narrow axial canal. The entire specimen is birefringent at the side view

Zygrhablithus bijugatus is distinguished from Zygrhablithus sileensis Varol (1989b) by lacking cone shape termination.

Bown, P. R. 2005d. Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research 27(1): 21-95.

Bown, P. R. 2010. Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research 31(1): 11-38.

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.

Hay, W. W., Mohler, H. P. & Wade, M. E. 1966. Calcareous nannofossils from Nal'chik (northwest Caucasus). Eclogae Geologicae Helvetiae 59: 379-399.

Locker, S. 1967a. Die Sphaeren der Oberkreide und die sogenannte Orbulinaritfazies. Geologie, Berlin. 16(7): 761-864.

Varol, O. 1989b. Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología 21: 273-320.