Nannotax3 - ntax_cenozoic - Blackites deflandrei

Citation: Blackites deflandrei (Perch-Nielsen, 1968) Bown, 2005

Basionym: Naninfula deflandrei Perch-Nielsen, 1968

Taxonomic discussion: Similar to Blackites moronium but has multi-cycle spine construction when viewed in XPL.

Distinguishing features:
Parent taxon (B. morionum group): Spine low, globular, height<2x width
This taxon: Spine relatively low, wide, hollow sacculiform; constructed from at least two distinct structural units when viewed in XPL; there may be a small, terminal papilla.
Typically the height and width are similar but the height can be greater. The spine is always slightly narrower than the base.

The spine broadens slightly to its maximum width in the lower cycle, before tapering to a point;

Blackites with broad coccolith base and broad, thin-walled, variably tall, dome-like to bullet-shaped spine. The spine is ornamented and parallel-sided in its lower part before tapering to a point. In SEM the ornamentation is revealed to be perforations/windows. The species was originally defined and illustrated as having variable spine height but the complete type specimens have a height less than the coccolith rim width. Here we distinguish two informal varieties based on spine height: variety 1 with height coccolith rim width. [Bown & Newsam 2017]

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Bown 2005

References:

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs O

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 O

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. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs

Muzylov, N. G. (1980). Стратиграфия палеогенаюга СССР по наннопланктону (Северный Кавказ и Крым) [Stratigraphy of the Paleogene of the south of USSR by nannoplankton (the North Caucasus and the Crimea). Akademiya Nauk SSSR. 148: -100. gs O

Perch-Nielsen, K. (1968). Naninfula, genre nouveau a nannofossiles calcaires du Tertiaire danois. Comptes rendus hebdomaire de l'Académie des sciences, Paris. 267: 2298-2300. 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 O

Shafik, S. (1989). Some new calcareous nannofossils from Upper Eocene and Lower Oligocene sediments in the Otway Basin, southeastern Australia. Alcheringa. 13: 69-83. gs

Blackites deflandrei

References:

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Sub-taxa & variants (time control age-window is: 0-800Ma)
				Blackites deflandrei 1 spine height < coccolith rim width
				Blackites deflandrei 2 spine height > coccolith rim width