Nannotax3 - ntax_mesozoic - Calyculus depressus

Calyculus depressus


Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae -> Calyculus -> Calyculus depressus
Sister taxa: 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
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:
TagsLITHS: placolith, elliptical, CA: concentric-ring(s), cross-axial, ca_disjunct, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith 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 (178.24-182.70Ma, top in Toarcian stage). Data source: Bown, 1987 (original description)
First occurrence (base): within Late Pliensbachian Substage (182.70-187.56Ma, 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


nannotaxlogo400px

Calyculus depressus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

Taxon Search:
Advanced Search

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



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics