Nannotax3 - ntax_mesozoic - Bilapillus Nannotax3 - ntax_mesozoic - Bilapillus

Bilapillus


Classification: ntax_mesozoic -> Holococcoliths -> Rarer genera -> Bilapillus
Sister taxa: Bifidalithus, Bilapillus, Multipartis, Munarinus, Octolithus, Okkolithus, Ottavianus, Pharus, Ramsaya, Russellia, Saepiovirgata ⟩⟨ Acuturris, Anfractus, Duocameratus, Lacunolithus-Bown, Metadoga, Nicholasia, Paulpearsonia, Petrobrasiella, Pseudoconus, Semihololithus, Stereorhabdus, Tanzanella, Thecatus, unidentified holococcoliths

Distinguishing features:
Parent taxon (Rarer genera): Less common genera
This taxon: Holococcolith with narrow rim and two blocks in central area


Daughter taxa (time control age-window is: 0-800Ma)
Bilapillus wadeae

Bilapillus sp.
Specimens not identified to species level

Taxonomy:

Citation: Bilapillus Lees, 2007
taxonomic rank: Genus
Type species: Bilapillus wadeae Lees 2007

Farinacci & Howe catalog pages: Bilapillus *

Distinguishing features:
Parent taxon (Rarer genera): Less common genera
This taxon: Holococcolith with narrow rim and two blocks in central area


Morphology:

"A holococcolith with a simple rim that is bright in XPL. At 0 ̊ in XPL, extinction lines form v-shapes at the ends of the lith. On rotation, the extinction lines become aligned with the polarising directions, whilst the short-axis line is offset on either side of the centre. Two adjacent polygonal blocks fill the central area." [Lees 2007]

Search data:
LITHS: holococcolith, elliptical, CA: pores, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
Lith size: 2->4µm; Segments: 2->2;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Santonian Stage (100% up, 83.7Ma, in Santonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs O


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Bilapillus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-5-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10062 Go to Archive.is to create a permanent copy of this page - citation notes
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