Calyculus cribrum

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; central area with axial cross,concentric lozenge.

Taxonomy:

Farinacci & Howe catalog pages: C. cribrum + * , C. pugnatum * , C. adjunctus *

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; central area with axial cross,concentric lozenge.

Morphology:

See also: Sollasites lowei - putative ancestral coccolith, with very similar central structure;

Geological Range:
Last occurrence (top): within NJ9 zone (170.07-172.30Ma, top in Bajocian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Late Pliensbachian Substage (184.20-188.00Ma, base in Pliensbachian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Calyculus

Calyculus cribrum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10185 Go to Archive.is to create a permanent copy of this page - citation notes

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