Nannotax3 - ntax_mesozoic - Chiastozygus trabalis

Chiastozygus trabalis


Classification: ntax_mesozoic -> Eiffellithales -> Chiastozygaceae -> Chiastozygus -> Chiastozygus trabalis
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, inner margin denticulate; cross complex, vaulted (centre of cross is above the rim)


Taxonomy:

Citation: Chiastozygus trabalis (Górka, 1957) Burnett, 1997
Rank: Species
Basionym: Discolithus trabalis Górka, 1957
Synonyms:

Farinacci & Howe catalog pages: D. trabalis * , Z. quaternus *

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, inner margin denticulate; cross complex, vaulted (centre of cross is above the rim)


Morphology:

This species is distinctive in having a fragile-looking, generally highly-birefringent, ragged inner rim and cross, the latter with a perforation at the centre. [Burnett 1997]


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 Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Burnett (1998)
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian stage). Data source: Burnett (1998)

Plot of occurrence data:

References:

al Rawahi, Z. & Dunkley Jones, T. (2019). Calcareous nannofossil assemblages of the Late Cretaceous Fiqa Formation, north Oman. Journal of Micropalaeontology. 38(1): 25-54. gs O

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

Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs V O

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. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs V 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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Chiastozygus trabalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2022

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