Assipetra infracretacea

Classification: Mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement -> Assipetra -> Assipetra infracretacea
Sister taxa: A. infracretacea, A. terebrodentarius, A. sp.,

Distinguishing features: Subrectangular nannolith with V-shaped extinction lines at either end.


Citation: Assipetra infracretacea (Thierstein, 1973) Roth, 1973
Rank: Species
Basionym: Micula infracretacea Thierstein, 1973

Farinacci & Howe catalog pages: Micula infracretacea *

Distinguishing features: Subrectangular nannolith with V-shaped extinction lines at either end.

Morphology remarks: Lacks the numerous radial sutures of the more globular Assiptetra terebrodentarius. The rather non-descript, crystalline nature of A. infracretacea makes identification difficult or impossible in heavily overgrown material.

Search data:
TagsLITHS: nannolith-radiate, quadrate, cylindrical, R-UNITS: R-prominent,
MetricsLith size: 5->10µm; Segments: 6->8;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Aptian Stage (112.95-126.30Ma, top in Aptian stage). Data source: [PRB estimate]
First occurrence (base): within Early Berriasian Substage (143.57-145.01Ma, base in Berriasian stage). Data source: Bown et al. 1998

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: Assipetra infracretacea, synonyms included - Assipetra infracretacea; Micula infracretacea;
  • space-time plot :: Samples map :: Parent: Assipetra


    Bown, P. R. (2005). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs :: view :: open

    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 :: ::

    Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. 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 :: view :: open

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


    Assipetra infracretacea compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-7-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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