Nannotax3 - ntax_mesozoic - Eiffellithus collis Nannotax3 - ntax_mesozoic - Eiffellithus collis

Eiffellithus collis


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Eiffellithus -> Eiffellithus collis
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: Like E. parvus but larger and with longer cross-arms. Medium sized, with blunt terminations to the cross-arms.


Taxonomy:

Citation: Eiffellithus collis Hoffmann, 1970
taxonomic rank: Species
Taxonomic discussion: This taxon is used by Perch-Nielsen (1985), Watkins & Bergen (2003) and Shamrock & Watkins (2009). They do not provide explicit species descriptions but the following comments makes their species concepts reasonably clear: 

Farinacci & Howe catalog pages: E. collis *

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: Like E. parvus but larger and with longer cross-arms. Medium sized, with blunt terminations to the cross-arms.

Most likely ancestor: Eiffellithus parvus - at confidence level 3 (out of 5). Data source: Watkins & Bergen 2003.

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, plate, process, diagonal cross, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Persists through the Late Cretaceous according Shamrock & Watkins (2009)
Last occurrence (top): within Late Albian Substage (100.50-107.59Ma, top in Albian stage). Data source: original description
First occurrence (base): within BC26 zone (103.27-104.06Ma, base in Albian stage). Data source: original description

Plot of occurrence data:

References:

Hoffmann, N. (1970e). Taxonomische Untersuchungen an Coccolithen aus der Kreide Norddeutchlands anhand elektronenmikroskopischer Aufnamen. Hercynia. 7(1-3): 163-198. gs

Shamrock, J. L. & Watkins, D. K. (2009). Evolution of the Cretaceous calcareous nannofossil genus Eiffellithus and its biostratigraphic significance. Cretaceous Research. 30(5): 1083-1102. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. 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 collis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10407 Go to Archive.is to create a permanent copy of this page - citation notes
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