Taxonomy:
Distinguishing features: Small, elliptical holococcoliths with two small blocks at either end of the lith and a circular central hole or depression, which is dark in XPL. In XPL, the blocks are relatively dark when the coccolith is orientated at 0° and brightest at 45°.
Farinacci & Howe catalog pages: L. unicavus *
Morphology: Small, elliptical holococcoliths with two small blocks at either end of the lith and a circular central hole or depression, which is dark in XPL. In XPL, the blocks are relatively dark when the coccolith is orientated at 0° and brightest at 45°. Differentiation: Differentiated from other Lanternithus by the single central hole and small, distinct blocks at each end of the coccolith. [Bown 2016]
Size: Holotype dimensions: L = 3.5μm
Tags | LITHS: holococcolith, elliptical, CROSS-POLARS: R-prominent, |
Metrics | Lith size: 3->4µm; Segments: 5->7; Data source notes: lith size from OD and illustrated specs |
Geological Range:
Last occurrence (top): within NP5 zone (59.54-61.51Ma, top in Selandian stage). Data source: Bown 2016
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Bown 2016
Plot of occurrence data:
Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gsReferences:
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Lanternithus unicavus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2021
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