Nannotax3 - Mesozoic - Crucibiscutum

Crucibiscutum

Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Crucibiscutum
Sister taxa: Biscutum, Discorhabdus, Similiscutum, Boletuvelum, Chiastella, Crucibiscutum, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Sollasites,

Distinguishing features: Elliptical with prominent, birefringent, axial cross.

Daughter taxa: (blue => in age window 0-800Ma)
				Crucibiscutum hayi Medium-sized (ca 5-6 µm)Crucibiscutum with relatively wide central area, relatively narrow rim and slender-armed axial cross.
				Crucibiscutum neuquenensis Medium-sized (ca 5-7 µm), broadly elliptical Crucibiscutum; central-area relatively wide, with off-axial (slightly-rotated) cross-bars.
				Crucibiscutum pinnatus Small (ca 3-5 µm)Crucibiscutum with central cross that is only weakly birefringent and does not fill the central area, delineating four perforations that are clearly visible in XPL.
				Crucibiscutum ryazanicum Crucibiscutum with an asymmetrical central cross.
				Crucibiscutum salebrosum Small (ca 3-5 µm) Crucibiscutum with narrow central area and birefringent cross. The central cross practically fills the narrow central area, and has the same intensity birefringence as the tube cycle (white).
				Crucibiscutum trilensis Medium-sized (ca 5-6 µm), Crucibiscutum; broadly elliptical with a relatively wide central-area .
				Podorhabdus quadriperforatus
				Crucibiscutum sp. Specimens not identified to species level

Taxonomy:

Citation: Crucibiscutum Jakubowski, 1986

Rank: Genus

Type species: Cruciplacolithus salebrosus Black, 1971, designated by Jakubowski, 1986.

Farinacci & Howe catalog pages: Crucibiscutum *

Distinguishing features: Elliptical with prominent, birefringent, axial cross.

Search data:

Tags	LITHS: placolith, elliptical, CA: cross-axial, process, diagonal cross, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
Metrics	Lith size: 3->7µm; Sources: 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 Cenomanian Stage (100% up, 93.9Ma, in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Berriasian Stage (0% up, 145Ma, in Berriasian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Biscutaceae

References:

Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

Jakubowski, M. (1986). New calcareous nannofossil taxa from the Lower Cretaceous of the North Sea. INA Newsletter. 8: 38-42. gs

Crucibiscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-4-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10316 Go to Archive.is to create a permanent copy of this page - citation notes

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