Tegulalithus


Classification: Mesozoic -> Braarudosphaerales -> Other nannoliths with tangential c-axes -> Tegulalithus
Sister taxa: Kokia, Tegulalithus,

Distinguishing features: Cylindrical nannoliths, typically with flanges at both ends and so cotton-reel-shaped in side view.


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

Cylindrical nannoliths with wall formed from a single cycle of ~16 elements and a lid (or flange) at each end formed from overlapping, concentric cycles of diamond-shaped elements. In side view the overall shape is cotton-reel-like.


Cylindrical nannolith with axial canal and narrow flanges at each end.
Specimens not identified to species level

Taxonomy:

Citation: Tegulalithus Crux, 1986
Rank: Genus
Type species: Lithastrinus septentrionalis Stradner, 1963, designated by Crux (1986).

Farinacci & Howe catalog pages: Tegulalithus *

Distinguishing features: Cylindrical nannoliths, typically with flanges at both ends and so cotton-reel-shaped in side view.


Morphology remarks: The two included species, T. septentrionalis and T. tessellatus, have disjunct stratigraphic ranges and may not be closely related.

Geological Range:
Last occurrence (top): at top of Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Hauterivian Stage (28% up, 133Ma, in Hauterivian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Crux, J. A. (1986). Tegulalithus, a new genus of Early Cretaceous calcareous nannofossils. INA Newsletter. 8: 88-90. gs

Stradner, H. (1963). New contributions to Mesozoic stratigraphy by means of nannofossils. Proceedings of the Sixth World Petroleum Congress. Section 1 Paper 4: 167-183. gs


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Tegulalithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11194 Go to Archive.is to create a permanent copy of this page - citation notes



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