Nannotax3 - ntax_mesozoic - Eiffellithus hancockii Nannotax3 - ntax_mesozoic - Eiffellithus hancockii

Eiffellithus hancockii


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Eiffellithus -> Eiffellithus hancockii
Sister taxa: E. eximius, E. lindiensis ⟩⟨ E. gorkae, E. keio, E. parallelus, E. pospichalii, E. turriseiffelii ⟩⟨ E. collis, E. equibiramus, E. parvus ⟩⟨ E. monechiae, E. praestigium, E. vonsalisiae, E. hancockii, E. paragogus ⟩⟨ E. primus, E. striatus, E. windii, E. sp.

Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Minute loxolith with very narrow central area filled with short axial cross bars.


Taxonomy:

Citation: Eiffellithus? hancockii Burnett, 1997
taxonomic rank: Species
Taxonomic discussion: Only tentatively included in Eiffellithus by Burnett (1997). Watkins & Bergen (2003 p.232) argued that this species was misplaced in Eiffelithus but they did not propose an alternative combination.

Farinacci & Howe catalog pages: E. hancockii *

Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Minute loxolith with very narrow central area filled with short axial cross bars.


Morphology:

A small- to medium-sized, elliptical coccolith with a thick bicyclic rim. The outer rim is relatively wide and dark and the inner rim is broader and highly birefringent. A very small, axial cross completely occupies the central area of the coccolith. [Burnett 1997]

Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, plate, process, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 4->6µm;
Data source notes: original description & 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 Middle Cenomanian Substage (95.50-96.24Ma, top in Cenomanian stage). Data source: Burnett 1997
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian stage). Data source: Burnett 1997

Plot of occurrence data:

References:

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

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

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

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

Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

Watkins, D. K. & Bergen, J. A. (2003). Late Albian adaptive radiation in the calcareous nannofossil genus Eiffelithus. Micropaleontology. 49(3): 231-252. gs


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Eiffellithus hancockii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-4-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10411 Go to Archive.is to create a permanent copy of this page - citation notes
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