Nannotax3 - ntax_mesozoic - Lithastrinus septenarius

Lithastrinus septenarius


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Lithastrinus -> Lithastrinus septenarius
Sister taxa: L. quadricuspis, L. pentabrachius, L. grillii, L. septenarius, L. sp.

Distinguishing features:
Parent taxon (Lithastrinus): Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.
This taxon: Lithastrinus with seven narrow, curving wall-elements surrounding a narrow central area.


Taxonomy:

Citation: Lithastrinus septenarius Forchheimer, 1972
Rank: Species
Taxonomic discussion: Varol (1992) used the name Lithastrinus moratus for this morphotype

Farinacci & Howe catalog pages: L. septenarius *

Distinguishing features:
Parent taxon (Lithastrinus): Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.
This taxon: Lithastrinus with seven narrow, curving wall-elements surrounding a narrow central area.


Morphology:


Size:

Most likely ancestor: Eprolithus moratus - at confidence level 3 (out of 5). Data source: Corbett & Watkins 2014, Varol 1992.
Likely descendants: Lithastrinus grillii; plot with descendants

Search data:
LITHS: nannolith-radiate, star-shaped, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 5->10µm; Segments: 7->7;
Data source notes: original description & illustrated specimens
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 UC11c subzone (100% up, 85.6Ma, in Santonian stage). Data source: Burnett 1998 (zonal marker)
First occurrence (base): at base of UC9a subzone (0% up, 91.8Ma, in Turonian stage). Data source: Burnett 1998 (zonal marker), fig.6.3

Plot of occurrence data:

References:

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

Corbett, M. J. & Watkins, D. K. (2014b). Transitional forms in the Eprolithus-Lithastrinus lineage: a taxonomic revision of Turonian through Santonian species. Micropaleontology. 60(2): 175-193. gs

Forchheimer, S. (1972). Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning, Series C. #668, 65: 1-141. gs O

Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs V O

Püttmann, T., Linnert, C., Dölling, B. & Mutterlose, J. (2018). Deciphering Late Cretaceous (Cenomanian to Campanian) coastline dynamics in the southwestern Münsterland (northwest Germany) by using calcareous nannofossils: Eustasy vs local tectonics,. Cretaceous Research. 87: 174-184. gs

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

Watkins, D. K. (1992). Upper Cretaceous nannofossils from Leg 120, Kergeulen Plateau, Southern Ocean. Proceedings of the Ocean Drilling Program, Scientific Results. 120: 343-370. gs V O


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Lithastrinus septenarius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10573 Go to Archive.is to create a permanent copy of this page - citation notes



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