Nannotax3 - ntax_mesozoic - Amphizygus brooksii

Amphizygus brooksii


Classification: ntax_mesozoic -> Eiffellithales -> Chiastozygaceae -> Amphizygus -> Amphizygus brooksii
Sister taxa: A. brooksii, A. microminutus, A. minimus, A. sp.

Distinguishing features:
Parent taxon (Amphizygus): Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.
This taxon: Bicyclic muroliths with complex transverse bar, formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.


Taxonomy:

Citation: Amphizygus brooksii Bukry, 1969
Rank: Species
Synonyms: Bipodorhabdus tesselatus Noel 1970
Variants: Amphizygus brooksii nanus; Bukry 1969 differentiated subspecies A. brooksii nanus and A. brooksii brooksii based on perforation size.
Taxonomic discussion: tt

Farinacci & Howe catalog pages: B. tesselatus * , A. brooksii nanus * , A. brooksii brooksii *

Distinguishing features:
Parent taxon (Amphizygus): Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.
This taxon: Bicyclic muroliths with complex transverse bar, formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.


Morphology:


Size:

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, bar, CROSS-POLARS: rim-bicyclic, V-prominent,
MetricsLith size: 6->9µm;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Zeugrhabdotus streetiae - possible junior synonym?;

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Burnett 1998

Plot of occurrence data:

References:

Blair, S. A. & Watkins, D. K. (2009). High-resolution calcareous nannofossil biostratigraphy for the Coniacian/Santonian Stage boundary, Western Interior Basin. Cretaceous Research. 30(2): 367-384. gs

Bralower, T. J. & Bergen, J. A. (1998). Cenomanian-Santonian calcareous nannofossil biostratigraphy of a transect of cores drilled across the Western Interior Seaway. In, Dean, W. E. & Arthur, M. A. (eds) Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway. SEPM Concepts in Sedimentology and Paleontology. -. gs

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

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

Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs

Hardas, P. & Mutterlose, J. (2007). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs

Kanungo, S., Bown, P. R. & Gale, A. S. (2020). Cretaceous (Albian-Turonian) calcareous nannofossil biostratigraphy of the onshore Cauvery Basin, southeastern India. Cretaceous Research. 118 [2021]: 1-22. gs

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. 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


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Amphizygus brooksii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-7-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10014 Go to Archive.is to create a permanent copy of this page - citation notes



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