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 a wide, hollow, ampulliform spine that broadens rapidly to a maximum width and then tapers to a narrow upper portion; the inflated part of the spine displays a distinctive cross-hatched pattern and the outer surface is serrated. The spine is much taller (x 3) and wider than the coccolith.
Farinacci & Howe catalog pages: R. piriformis *
Search data:
LITHS: planolith, circular, elliptical, CA: ca_disjunct, grill, process, |
Lith size: 10->15µm; Data source notes: lith size (spine height) from 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 NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Bown 2005
Plot of occurrence data:
Aubry, M. -P. (1999). Handbook of Cenozoic calcareous nannoplankton. Book 5: Heliolithae (Zygoliths and Rhabdoliths). Micropaleontology Press, American Museum of Natural History, New York. 1-368. gs 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 Khan, M. R., Pavlovec, R. & Pavsic, J. (1975). Eocene microfossils from Podgrad. Geologija. 18: 9-60. gsReferences:
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Blackites piriformis 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=115 Go to Archive.is to create a permanent copy of this page - citation notes |
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