Nannotax3 - ntax_mesozoic - Calyculus depressus Nannotax3 - ntax_mesozoic - Calyculus depressus

Calyculus depressus


Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae -> Calyculus -> Calyculus depressus
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: Small elliptical Calyculus; rim low & narrow; central area with axial cross and concentric lozenge.


Taxonomy:

Citation: Calyculus depressus Bown, 1987
Taxonomic rank: species

Farinacci & Howe catalog pages: C. depressus *

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: Small elliptical Calyculus; rim low & narrow; central area with axial cross and concentric lozenge.


Size:
ca 3.5 µm long

Search data:
LITHS: placolith, elliptical, CA: concentric-ring(s), cross-axial, ca_disjunct, CROSS-POLARS: V-prominent, rim-unicyclic,
Lith size: 3->4µm;
Data source notes: holotype +/- 0.5 µm
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: Bown, 1987 (original description)
First occurrence (base): within Late Pliensbachian Substage (184.20-188.00Ma, base in Pliensbachian stage). Data source: Bown, 1987 (original description)

Plot of occurrence data:

References:

Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs


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Calyculus depressus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10186 Go to Archive.is to create a permanent copy of this page - citation notes
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