Nannotax3 - ntax_mesozoic - Hayesites

Hayesites


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

Distinguishing features:
Parent taxon (Nannoliths inc sed - radiate multielement): Radiate nanoliths formed of multiple elements but lacking a central diaphragm
This taxon: Stellate nannoliths with 6-11 imbricate rays. Small subsidiary cycles and spines may be present.


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Hayesites albiensis
Small stellate nannolith with 6-8 rays, which may be long when well preserved.

Hayesites irregularis
Small compact nannolith with 9-11 short free rays of variable size. The ouline is typically irregular.
Hayesites irregularis early form - elongated
Hayesites irregularis later form - subcircular

Hayesites sp.
Specimens not identified to species level

Taxonomy:

Citation: Hayesites Manivit, 1971
Rank: Genus
Type species: Hayesites albiensis Manivit, 1971
Taxonomic discussion: Morphologies range from typical irregular, multirayed H. irregularis forms, to more regular six and seven rayed forms comparable with H. albiensis

Retecapsa angustiforata has very large calices (spine-tops) which form distinctive nannofossils when they break off. These were assigned to the species Rucinolithus radiatus (synonym Hayesites bulbus), until the connection with R. angusitforata was established. It is likely that H. irregularis has a similar origin.

Farinacci & Howe catalog pages: Hayesites + *

Distinguishing features:
Parent taxon (Nannoliths inc sed - radiate multielement): Radiate nanoliths formed of multiple elements but lacking a central diaphragm
This taxon: Stellate nannoliths with 6-11 imbricate rays. Small subsidiary cycles and spines may be present.


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, circular, star-shaped, CA: process, CROSS-POLARS: R-prominent,
Lith size: 4->7µm;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): at top of Barremian Stage (98% up, 126.4Ma, in Barremian 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). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Manivit, H. (1971). Nannofossiles calcaires du Crétacé francais (Aptien-Maestrichtien). Essai de Biozonation appuyée sur les stratotypes. PhD thesis, Université de Paris. -. gs


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Hayesites compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10495 Go to Archive.is to create a permanent copy of this page - citation notes



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