Classification: ntax_cenozoic -> Coccolithales -> Calcidiscaceae -> Hayella
Sister taxa: Calcidiscus, Hayaster, Oolithotus, Umbilicosphaera, Cryptococcolithus, Hayella

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Hayella challengeri
Medium sized, tubular murolith, with proximal and distal flanges.

Hayella gauliformis
Flaring, trumpet-shaped coccolith (holotype side view only).

Hayella simplex
Medium-sized (5-7 µm) circular placoliths with an open, vacant central-area. The shield elements are distinct and show obliquity. The shield image is brighter towards the inner edge.

Hayella situliformis
Medium-sized circular placolith coccoliths with a wide, open central area and highly birefringent tube cycle. Shield elements are distinct and show obliquity.

Hayella sp.
Specimens which cannot be assigned to established species


Citation: Hayella Gartner, 1969
Rank: Genus
Type species: Hayella situliformis Gartner, 1969
Synonyms: Nannocorbis Müller 1974
Taxonomic discussion: As explained, in detail, on the relevant Farinacci catalog page the taxon Hayella Roth is a junior homonym of Hayella Gartner.

Distinguishing features: Coccoliths cylindrical, with shields separated by an elevated tube

Farinacci & Howe catalog pages: Hayella + * , Nannocorbis *

Search data:
TagsLITHS: placolith, circular, cylindrical, hollow, CA: vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->9µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): near base of Zanclean Stage (12% up, 5.1Ma, in Zanclean stage). Data source: Total of range of species in this database
First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Bown, P. R., Dunkley-Jones, T. & Young, J. R. (2007). Umbilicosphaera jordanii Bown 2005 from the Paleogene of Tanzania: confirmation of generic assignment and a Paleocene origination for the family Calcidiscaceae. Journal of Nannoplankton Research. 29(1): 25-30. gs V O

Gartner, S. (1969c). Two new calcareous nannofossils from the Gulf Coast Eocene. Micropaleontology. 15(1): 31-34. gs

Gartner, S. (1969a). Hayella Roth and Hayella Gartner. Micropaleontology. 15: 490-490. gs

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O


Hayella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=644 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (1)

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Rui da Gama (KL, Malaysia)

Please note: From left, 2nd and 3rd image of Hayella simplex are same as 2nd and 4th image of Hayella spp. Better to remove to avoid confusion.

Jeremy Young (UK)

Quite right - I have now changed those, but I need to check with Paul to see if all the images of Hayella sp. from Bown 2005 are actually now assignable to Hayella simplex. Thanks for pointing that out


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