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

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 (1967); having a short, truncated distal process

Zygrhablithus bijugatus cornutus Bown (2005); 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 (1989) by lacking cone shape termination.

Bown, P. R., (2005): 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 sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. - 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.

Locker, S., (1967):. Neue, statigraphisch wichtige Coccolithophoriden (Flagellata aus dem norddeutschen Altetiar). - Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 9(9-10): 758-769.

Perch-Nielsen, K., (1971): Einige neue Coccolithen aus dem Paläozän der Bucht von Biskaya und dem Eozän der Labrador See. - Bulletin of the Geological Society of Denmark. 21: 347-361.

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