Tegulalithus septentrionalis


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

Distinguishing features:

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: Lithastrinus septentrionalis * , ,

Distinguishing features:

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 remarks:

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.

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:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Tegulalithus septentrionalis, synonyms included - Eprolithus septentrionalis; Lithastrinus septentrionalis; Tegulalithus septentrionalis; space-time plot :: Samples map :: Parent: Tegulalithus

    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

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

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

    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: 21-7-2019

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    Short stable page link: http://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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