Nannotax3 - ntax_mesozoic - Calyculaceae

Calyculaceae


Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae
Sister taxa: Axopodorhabdaceae, Biscutaceae, Calyculaceae, Cretarhabdaceae, Mazaganellaceae, Prediscosphaeraceae, Tubodiscaceae

Distinguishing features:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view.


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Calyculus
High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
C. - late Jurassic
C. cribrum
C. depressus
C. noeliae
C. hommerili
C. serrai
C. absolutus
C. derivatus
C. magnus
C. sp.

Carinolithus
Trumpet-shaped coccoliths with small, disc-like proximal shield and high, flaring distal shield.
C. magharensis
C. superbus
C. poulnabronei
C. sp.

Taxonomy:

Citation: Calyculaceae Noël, 1973
Rank: Family

Farinacci & Howe catalog pages: Calyculaceae [no catalog entry yet]

Distinguishing features:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view.


Morphology:


Size:

Search data:
TagsLITHS: placolith,
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of Bathonian Stage (50% up, 167.2Ma, in Bathonian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Pliensbachian Stage (40% up, 187.6Ma, in Pliensbachian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle. 75 [1972]: 95-156. gs V O


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Calyculaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-5-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10182 Go to Archive.is to create a permanent copy of this page - citation notes



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