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Blackites mericii


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. morionum group -> Blackites mericii
Sister taxa: B. atanii, B. deflandrei, B. hayi, B. mericii, B. morionum, B. shafikii, B. australiensis, B. elongatus, B. perfectus, B. prolatus, B. rothii

Taxonomy:

Citation: Blackites mericii (Varol, 1989) Young 2023
Taxonomic rank: species
Basionym: Cruxia mericii Varol, 1989
Taxonomic discussion: The genus Cruxia was described by Varol (1989) for Blackites type coccoliths with "height almost equal to its maximum width and its complex distal process having a distinct eave at its greatest diameter". Of the two species originally in the genus one, C. atanii was recombined into Blackites by Bown 2005, and C. mericii by Young (2023)

Distinguishing features:
Parent taxon (B. morionum group): Spine low, globular, height<2x width
This taxon: Small rhabdoliths with relatively low, hollow, sacculiform spines. Spine broadens from base and is capped by curving upper surface that appears to be constructed from two parts (XPL); spine usually slightly wider than coccolith. Coccolith rim appears to be narrow, and only one cycle has been observed

Farinacci & Howe catalog pages: C. mericii *


Size:
Height 2.3-3.0_m; Width = 2.7-2.8_m; Spine width = 2.8-3.2_m. (Bown 2005)

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, grill, process,
Lith size: 2->4µm;
Data source notes: lith size (spine height) from OD & Bown 2005
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: Bown 2005
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Varol, 1989

Plot of occurrence data:

References:

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

Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 265-310. gs

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

Young, J. R. (2023). Some proposed changes to the systematics of Cenozoic and Mesozoic nannoplankton. Journal of Nannoplankton Research. 41(1): 15-25. gs

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Blackites mericii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-1-2025

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