Nannotax3 - ntax_main - Tintinnabuliformis bicornus Nannotax3 - ntax_main - Tintinnabuliformis bicornus

Tintinnabuliformis bicornus


Classification: ntax_main -> Nannolith families inc sed -> Lapideacassaceae -> Tintinnabuliformis -> Tintinnabuliformis bicornus
Sister taxa: T. bicornus, T. unicorn, T. sp.


Taxonomy:
Citation: Tintinnabuliformis bicornus Varol 1991
Taxonomic rank: species
Taxonomic discussion: Calciopilleus obscurus Muller 1974 is a possible senior synonym - see SEMs included here. 

Distinguishing features:
Parent taxon (Tintinnabuliformis): Bell shaped nannofossil with basal flange and apical horn(s), formed of single cycle of elements
This taxon: Species of Tintinnabuliformis with two horns

Farinacci & Howe catalog pages:
T. bicornus *


Morphology:
Through-focal LM images from David Bord (this site) show that the coccoliths have a pattern of spiral ridges on the surface, showing anticlockwise imbrication. They also show that it is formed of singel cycle of elements with broadly radial crystalographic c-axes.

Search data:
LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: process, CROSS-POLARS: R-prominent,
Lith size: 5->7µm;
Data source notes: lith length from OD and slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN7 zone (10.89-11.90Ma, top in Tortonian stage). Data source: original description
First occurrence (base): within NN6 zone (11.90-13.53Ma, base in Serravallian stage). Data source: original description

Plot of occurrence data:

References:

Varol, O. (1991). New Cretaceous and Tertiary Calcareous Nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 182: 211-237. gs


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Tintinnabuliformis bicornus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-6-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1411 Go to Archive.is to create a permanent copy of this page - citation notes



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