Nannotax3 - ntax_mesozoic - Chiastozygus stylesii

Chiastozygus stylesii


Classification: ntax_mesozoic -> Eiffellithales -> Chiastozygaceae -> Chiastozygus -> Chiastozygus stylesii
Sister taxa: C. amphipons, C. bifarius, C. lamprostauros, C. litterarius, C. platyrhethus, C. spissus ⟩⟨ C. antiquus, C. garrisonii, C. stylesii, C. trabalis ⟩⟨ C. propagulis, C. quadriperforatus, C. synquadriperforatus, C. tenuis, C. sp.

Distinguishing features:
Parent taxon (Chiastozygus): Murolith (loxolith) coccoliths with relatively narrow rim and wide central area spanned by diagonal bars. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic.
This taxon: Rim bicyclic, bright inner cycle broader; Cross wide, bright and simple; Elongate shape


Taxonomy:

Citation: Chiastozygus stylesii Burnett, 1997
Rank: Species

Farinacci & Howe catalog pages: C. stylesii *

Distinguishing features:
Parent taxon (Chiastozygus): Murolith (loxolith) coccoliths with relatively narrow rim and wide central area spanned by diagonal bars. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic.
This taxon: Rim bicyclic, bright inner cycle broader; Cross wide, bright and simple; Elongate shape


Morphology:

A distinctive species of Chiastozygus with an elongated, elliptical rim with a narrow dark outer and wider bright inner cycle. The 45° cross is thick, each arm apparently composed of a single calcite block, and is reminiscent of a propeller blade. Opposite arms go into extinction together.
It is distinguished from other species of Chiastozygus by its distinctive elongated-ellipse outline and its highly birefringent propeller-like cross.


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, process, diagonal cross, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 5->7µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Coniacian Stage (86.26-89.77Ma, top in Coniacian stage). Data source: Burnett (1998)
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Burnett (1998)

Plot of occurrence data:

References:

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O

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

Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs


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Chiastozygus stylesii 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=10257 Go to Archive.is to create a permanent copy of this page - citation notes



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