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:
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
Search data:
LITHS: placolith, elliptical, hollow, CA: concentric-ring(s), cross-axial, grill, ca_disjunct, CROSS-POLARS: V-prominent, rim-unicyclic, |
Lith size: 3->5µm; Data source notes: holotype +/- 1µm |
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:
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 References:
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Calyculus hommerili compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2025
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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