Nannotax3 - ntax_cenozoic - Rhabdosphaera vitrea Nannotax3 - ntax_cenozoic - Rhabdosphaera vitrea

Rhabdosphaera vitrea


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Rhabdosphaera -> Rhabdosphaera vitrea
Sister taxa: R. clavigera, R. gracilenta, R. poculii, R. vitrea, R. xiphos, R. sp.

Taxonomy:

Citation: Rhabdosphaera vitrea (Deflandre in Deflandre & Fert, 1954) Bramlette & Sullivan, 1961
Taxonomic rank: species
Basionym: Rhabdolithus vitreus Deflandre in Deflandre & Fert, 1954
Synonyms: Blackites vitreus (Deflandre in Deflandre & Fert, 1954) Shafik, 1981

Distinguishing features:
Parent taxon (Rhabdosphaera): Coccoliths without radial lath cycle; coccospheres dimorphic, only some spine-bearing
This taxon: Rhabdoliths with a very narrow styliform spine and four buttress-like structures at the base of the spine, which appear as a collar in LM.

Farinacci & Howe catalog pages: R. vitreus *


Morphology:

Rhabdoliths with a very narrow styliform spine that typically has a prominent basal collar. In LM the coccolith is broad and thin, and dominated by the inner cycle, with the outer cycle forming only the outermost edge. SEM images show the four buttress-like structures at the base of the spine, which appear as a collar in LM. It also appears that R. vitrea lacks the radial lath cycle characteristic of Blackites, hence the inclusion within the genus Rhabdosphaera.

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, cross-axial, process, CROSS-POLARS: R-prominent,
Lith size: 8->12µm;
Data source notes: lith length from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP23 zone (29.62-32.02Ma, top in Rupelian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Bown 2005

Plot of occurrence data:

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

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs 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. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. 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. (1981). Nannofossil biostratigraphy of the Hanktenina (foraminiferid) interval in the Upper Eocene of southern Australia. BMR Journal of Australian Geology and Geophysics. 6: 108-116. gs

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


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Rhabdosphaera vitrea compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-2-2025

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