Assipetra


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

Distinguishing features: Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.


Daughter taxa: (blue => in age window 0-800Ma)
Subrectangular nannolith with V-shaped extinction lines at either end.
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.
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: Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.

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). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

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

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


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Assipetra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-12-2019

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Short stable page link: http://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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