Nannotax3 - ntax_main - Calyculus absolutus Nannotax3 - ntax_main - Calyculus absolutus

Calyculus absolutus


Classification: ntax_main -> Mesozoic nannofossils -> Podorhabdales -> Calyculaceae -> Calyculus -> Calyculus absolutus
Sister taxa: C. - late Jurassic ⟩⟨ C. cribrum, C. depressus ⟩⟨ C. noeliae ⟩⟨ C. hommerili, C. serrai ⟩⟨ C. absolutus, C. derivatus, C. magnus, C. sp.

Taxonomy:

Citation: Calyculus absolutus (Goy in Goy et al., 1979) Crux, 1987
Taxonomic rank: species
Basionym: Incerniculum absolutum Goy in Goy et al., 1979

Distinguishing features:
Parent taxon (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.
This taxon: Elliptical Calyculus; rim moderately elevated, narrow; central area with finely perforate net and spine-base

Farinacci & Howe catalog pages: I. absolutum *

Search data:
LITHS: placolith, elliptical, hollow, CA: ca_disjunct, grill, CROSS-POLARS: rim-unicyclic, V-prominent,
Lith size: 5->7µm;
Data source notes: holotype +/- 1µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Toarcian Substage (177.50-184.20Ma, top in Toarcian stage). Data source: Goy et al. 1979
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Goy et al. 1979

Plot of occurrence data:

References:

Crux, J. A. (1987a). Concerning dimorphism in Early Jurassic coccoliths and the origin of the genus Discorhabdus Noël 1965. Abhandlungen der Geologischen Bundesanstalt. 39: 51-55. gs

Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Document des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs O

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


nannotaxlogo400px

Calyculus absolutus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-5-2025

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10184 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image

Comments

No comments yet. Be the first!