Nannotax3 - ntax_mesozoic - Calyculus hommerili

Calyculus hommerili


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

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 low; central area with axial cross; concentric lozenge and short radial bars


Taxonomy:

Citation: Calyculus hommerili (Goy in Goy et al., 1979) Crux, 1987
Rank: Species
Basionym: Catillus hommerili Goy in Goy et al., 1979

Farinacci & Howe catalog pages: C. hommerili *

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 low; central area with axial cross; concentric lozenge and short radial bars


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: placolith, elliptical, hollow, CA: concentric-ring(s), cross-axial, ca_disjunct, grill, CROSS-POLARS: rim-unicyclic, V-prominent,
Lith size: 3->5µm;
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 (178.24-182.70Ma, top in Toarcian stage). Data source: Goy et al. 1979
First occurrence (base): within Early Toarcian Substage (178.24-182.70Ma, 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 V O

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. Documents des laboratories de géologie Lyon. 75: 33-57. gs O

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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Calyculus hommerili compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-12-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10188 Go to Archive.is to create a permanent copy of this page - citation notes



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