arrayname: original
Taxonomy:
Distinguishing features:
Parent taxon (B. inflatus group): Spine inflated with maximum width above base, many with conspicous bulge
This taxon: Rhabdoliths with hollow ampulliform spines that are narrow at their base and wide and rounded distally; the inflated part of the spine displays a distinctive striated pattern. The coccolith is broad, and the outer cycle lies distally over the inner cycle and forms the outer edge of the coccolith. The spine is greater than half the width of the coccolith and usually has a prominent basal collar.
Farinacci & Howe catalog pages: B. rotundus *
Search data:
LITHS: planolith, circular, elliptical, CA: ca_disjunct, grill, process, |
Lith size: 6->9µm; Data source notes: lith size (spine height) from OD & illustrated specimens |
Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Bown 2005
Plot of occurrence data:
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 Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs References:
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Blackites rotundus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=118 Go to Archive.is to create a permanent copy of this page - citation notes |
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