Nannotax3 - ntax_mesozoic - Tegulalithus septentrionalis

Tegulalithus septentrionalis


Classification: ntax_mesozoic -> Braarudosphaerales -> Other nannoliths with tangential c-axes -> Tegulalithus -> Tegulalithus septentrionalis
Sister taxa: T. septentrionalis, T. tessellatus, T. sp.

Distinguishing features:
Parent taxon (Tegulalithus): Cylindrical nannoliths, typically with flanges at both ends and so cotton-reel-shaped in side view.
This taxon: 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.


Taxonomy:

Citation: Tegulalithus septentrionalis (Stradner, 1963) Crux, 1986
Rank: Species
Basionym: Lithastrinus septentrionalis Stradner, 1963
Synonyms:

Eprolithus septentrionalis (Stradner 1963) Perch-Nielsen 1984

Farinacci & Howe catalog pages: L. septentrionalis *

Distinguishing features:
Parent taxon (Tegulalithus): Cylindrical nannoliths, typically with flanges at both ends and so cotton-reel-shaped in side view.
This taxon: 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.


Morphology:

Resembles a nannoconid in XPL, but is easily differentiated in PC, and in side view. There is variation in the size and development of the flanges (formed by the proximal and distal plates overhanging the wall), however, the proximal and distal flanges are always equally developed.


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, cylindrical, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 4->8µm; Segments: 15->20;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Nannoconus pseudoseptentrionalis - rather similar Nannoconid;

Geological Range:
Last occurrence (top): at top of BC10 zone (100% up, 132.7Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker
First occurrence (base): at base of BC9 zone (0% up, 133Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker

Plot of occurrence data:

References:

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

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

Perch-Nielsen, K. (1984b). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs V O

Rutledge, D. & Bown, P. R. (1996). New names for old: taxonomic clarification of some Early Cretaceous nannofossil marker-species. Journal of Nannoplankton Research. 18(2): 53-59. gs V O

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

Stradner, H., Aubry, M. -P. & Bonnemaison, M. (2010). Calcareous nannofossil type specimens in the collection of the Geological Survey of Austria: A taxonomic and stratigraphic update. Jahrbuch der Geologischen Bundesanstalt. 150(1-2): 9-84. gs V O

Varol, O. (1992b). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gs


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Tegulalithus septentrionalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-11-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11195 Go to Archive.is to create a permanent copy of this page - citation notes



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