Nannotax3 - ntax_cenozoic - Holodiscolithus macroporus

Citation: Holodiscolithus macroporus (Deflandre in Deflandre & Fert, 1954) Roth, 1970

Basionym: Discolithus macroporus Deflandre in Deflandre & Fert, 1954

Synonyms: Orthozygus macroporus (Deflandre in Deflandre & Fert, 1954) Perch-Nielsen 1971

Taxonomic discussion: Arguably a synonym of Syracolithus schilleri and so of Scyphosphaera apsteinii HOL, but in the fossil record the name is applied rather loosely.

Distinguishing features: Elliptical, non-birefringent in plan view, with 10-16 pores

Morphology: Elliptical non-birefringent holococcoliths that appears as a dark plate pierced by a variable number of pores (10-16); a distinct rim is sometimes discernible. In side view a rim and proximal plate can be distinguished from the central perforate plate.

Geological Range:
Last occurrence (top): within NN20 zone (0.29-0.44Ma, top in Ionian stage). Data source: [JRY rough estimate]
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Dunkley Jones et al., 2009

References:

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. gs V O

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. gs V O

Bybell, L. & Self-Trail, J. (1997). Late Paleocene and Early Eocene calcareous nannofossils from three boreholes in an onshore-offshore transect from New Jersey to the Atlantic continental rise. Proceedings of the Ocean Drilling Program, Scientific Results. 150: 91-110. gs V O

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

Müller, C. (1974c). Nannoplankton aus dem Mittel-Miozän von Walbersdorf (Burgenland). Senckenbergiana Lethaea. 55: 389-405. gs

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Roth, P. H. (1970). Oligocene calcareous nannoplankton biostratigraphy. Eclogae Geologicae Helvetiae. 63: 799-881. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O

Tags	LITHS: holococcolith, elliptical, CA: pores, CROSS-POLARS: 1ou, V-prominent,
Metrics	Lith size: 3.5->5µm; Data source notes: lith size from illustrated specs

Holodiscolithus macroporus

References:

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