Nannotax3 - ntax_cenozoic - Calicasphaera Nannotax3 - ntax_cenozoic - Calicasphaera

Calicasphaera


Classification: ntax_cenozoic -> Holococcoliths -> open-tube -> Calicasphaera
Sister taxa: Calicasphaera, Papposphaera HOL, Trigonaspis

Daughter taxa (time control age-window is: 0-800Ma)
Calicasphaera bipora
Liths oval, low, with openings at either end of central area
Calicasphaera blokii
Liths oval, low, with blocky crystallites.
Calicasphaera concava
Liths circular, almost as high as wide, opening continuously from narrow base; proximal opening
Calicasphaera diconstricta
Liths sub-circular; tall stem, with two constrictions.
Calicasphaera sp.
Specimens which cannot be assigned to established species

Taxonomy:

Citation: Calicasphaera Kleijne, 1991
taxonomic rank: Genus
Type species: Calicasphaera diconstricta Kleijne, 1991

Distinguishing features:
Parent taxon (open-tube): Holococcoliths with tube, open distally (or cover recessed)
This taxon: Chalice-shaped coccoliths. Monomorphic

Farinacci & Howe catalog pages: Calicasphaera *


Morphology:

The coccoliths outer tube of the coccoliths is formed of regular calcit rhombohedra, at the base there is usually a proximal flange conssiting of a single ring of crystallites and a proximal plate which may cover the central area or have a central opening (especially in C. concava). In distal view additional less regular crystalites ocur within the tube, it is not celar whether these form an inner tube or or a recessed distal cover. The irregular appearance of these inner crystallites is a distinctive aspect of the morphology of the genus.


Phylogenetic relations

Possible affinities to Turrisphaera - based on general morphlogy.

Search data:
LITHS: holococcolith, circular, cylindrical, hollow, CROSS-POLARS: R-prominent,
Lith size: 1->1.5µm; Coccosphere size: 5->11µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gs


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Calicasphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-10-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=209 Go to Archive.is to create a permanent copy of this page - citation notes
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