Bilapillus


Classification: 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: Holococcolith with narrow rim and two blocks in central area


Daughter taxa: (blue => in age window 0-800Ma)

Specimens not identified to species level

Taxonomy:

Citation: Bilapillus Lees, 2007
Rank: Genus
Type species: Bilapillus wadeae Lees 2007

Farinacci & Howe catalog pages: Bilapillus *

Distinguishing features: Holococcolith with narrow rim and two blocks in central area


Morphology remarks: "A holococcolith with a simple rim that is bright in XPL. At 0 ĚŠ 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]

Geological Range:
Last occurrence (top): at top of Santonian Stage (100% up, 83.6Ma, in Santonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Cenomanian Stage (0% up, 100.5Ma, in Cenomanian stage). Data source: Total of range 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


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Bilapillus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-8-2019

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Short stable page link: http://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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