Nannotax3 - ntax_mesozoic - Eprolithus apertior

Eprolithus apertior


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Eprolithus -> Eprolithus apertior
Sister taxa: E. rarus, E. moratus, E. octopetalus, E. floralis, E. apertior, E. antiquus, E. sp.

Distinguishing features:
Parent taxon (Eprolithus): Moderately tall, circular to stellate, multiradiate nannoliths with 5-9 petaloid wall-cycle elements surrounding a wide central area spanned by a median diaphragm. Typically H-shaped in side view.
This taxon: Eprolithus with nine wall-elements and tall wall


Taxonomy:

Citation: Eprolithus apertior Black, 1973
Rank: Species
Taxonomic discussion: Originally described as “resembling E. floralis very closely” (Black, 1973), and may represent a variant.

Farinacci & Howe catalog pages: E. apertior *

Distinguishing features:
Parent taxon (Eprolithus): Moderately tall, circular to stellate, multiradiate nannoliths with 5-9 petaloid wall-cycle elements surrounding a wide central area spanned by a median diaphragm. Typically H-shaped in side view.
This taxon: Eprolithus with nine wall-elements and tall wall


Morphology:

The wide central area is spanned by a diaphragm.

Size:

Most likely ancestor: Radiolithus orbiculatus - at confidence level 3 (out of 5). Data source: Varol 1992 (modified to include E. apertior).
Likely descendants: Eprolithus floralis; plot with descendants

Search data:
LITHS: nannolith-radiate, star-shaped, cylindrical, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 4->8µm; Segments: 9->9;
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:
Notes: LAD is earlier at low latitudes - in UC7 (Burnett 1998)
Last occurrence (top): in upper part of UC9a subzone (70% up, 91Ma, in Turonian stage). Data source: Burnett 1998, fig. 6.3
First occurrence (base): in upper part of BC18 zone (75% up, 125.9Ma, in Aptian stage). Data source: Bown et al. 1998, fig. 5.3

Plot of occurrence data:

References:

Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

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. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs O

Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs


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Eprolithus apertior compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10433 Go to Archive.is to create a permanent copy of this page - citation notes



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