Nannotax3 - ntax_mesozoic

Nannotax3 - ntax_mesozoic - Chiastella

Chiastella

Classification: ntax_mesozoic -> Podorhabdales -> Biscutaceae -> Chiastella
Sister taxa: Biscutum, Discorhabdus, Similiscutum ⟩⟨ Boletuvelum, Chiastella, Crucibiscutum, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Sollasites

Distinguishing features:
Parent taxon (Biscutaceae): Regular placoliths; rim broad, central area relatively narrow, with variable central structures.
The distal shield is formed from V-units and the proximal shield and tube cycle are formed from R-units.
This taxon: Elliptical, minute with diagonal cross suporting a hollow spine

Daughter taxa (time control age-window is: 0-800Ma)
				Chiastella grana

Taxonomy:

Citation: Chiastella Lambert 1993

Rank: Genus

Type species: Chiastella grana Lambert, 1993

Taxonomic discussion: Assignment here to Biscutaceae is tentative since only a couple of SEM images are available, but if it is correct then the one species, C. grana, could be reassigned to Crucibiscutum.

Farinacci & Howe catalog pages: Chiastella *

Morphology:

Size:

<2 µm

Search data:

Tags	LITHS: placolith, elliptical, CA: ca_disjunct, process, diagonal cross,
Metrics	Lith size: 2.5->3.5µm; Data source notes: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Albian Stage (0% up, 113Ma, in Aptian stage). Data source: Total of range of species in this database

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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Biscutaceae

References:

Lambert, B. (1993). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional (Deuxième Partie). Cahiers de Micropaléontologie. 8(2): 183-225. gs

Chiastella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-5-2022

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10243 Go to Archive.is to create a permanent copy of this page - citation notes

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