Leesella procera


Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Leesella -> Leesella procera
Sister taxa: L. procera, L. sp.

Taxonomy:

Citation: Leesella procera Bown & Dunkley Jones, 2006
Rank: Species

Distinguishing features: Variably tall cylindrical nannofossils with a narrow axial canal, that flare from a small basal disc to form a trumpet shape.  Formed from a single cycle of crystal units with co-planar radial c-axes.

Farinacci & Howe catalog pages: L. procera *


Morphology: Described by Bown & Dunkley Jones (2006) as "Variably tall nannoliths that flare from a small basal disc to form a trumpet shape. They appear to be formed from a single crystallographic unit, have a narrow axial canal and are usually seen in side-view. However, the appearance in xpl suggests that they are heterococcoliths predominantly formed from R-units with horizontal c-axes - i.e. all the c-axes are co-planar and so in edge view appear to behave as a single optical unit. Note the central dark line where the c-axes are pointing directly toward the camera, if the nannofossil was formed of a single crystal unit this part would appear bright. [my interpretation - JRY 2017]

Size: Type material height 2.0-6.9 microns.

Search data:
TagsLITHS: placolith, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 2->7µm;
Data source notes: lith length from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Bown & Dunkley Jones, 2006
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2006

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O

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 V O

Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs


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Leesella procera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=810 Go to Archive.is to create a permanent copy of this page - citation notes



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