Nannotax3 - ntax_mesozoic - Assipetra

Assipetra


Classification: ntax_mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement -> Assipetra
Sister taxa: Acadialithus, Assipetra, Hayesites, Phosterolithus, Rucinolithus, Sikoraea

Distinguishing features:
Parent taxon (Nannoliths inc sed - radiate multielement): Radiate nanoliths formed of multiple elements but lacking a central diaphragm
This taxon: Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.


Daughter taxa (time control age-window is: 0-800Ma)
Assipetra infracretacea
Subrectangular nannolith with V-shaped extinction lines at either end.
Assipetra terebrodentarius
Blocky, globular nannoliths formed from six or more complexly intergrown calcite blocks that are joined along broadly radial sutures; roughly circular in plan view and rectangular in side view.
Assipetra sp.
Specimens not identified to species level

Taxonomy:

Citation: Assipetra Roth, 1973
Rank: Genus
Type species: Micula infracretacea Thierstein, 1973 designated by Roth, 1973.

Farinacci & Howe catalog pages: Assipetra *

Distinguishing features:
Parent taxon (Nannoliths inc sed - radiate multielement): Radiate nanoliths formed of multiple elements but lacking a central diaphragm
This taxon: Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, circular, quadrate, cylindrical, CROSS-POLARS: R-prominent,
Lith size: 4->13µm;
Data source notes: 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 Campanian Stage (100% up, 72.1Ma, in Campanian 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:

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

Roth, P. H. (1973). Calcareous nannofossils: Leg 17 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 17: 695-795. gs O

Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs V O


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Assipetra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10043 Go to Archive.is to create a permanent copy of this page - citation notes



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