Nannotax3 - ntax_mesozoic - Broinsonia ethmoquadrata

Broinsonia ethmoquadrata


Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia ethmoquadrata
Sister taxa: B. parca, B. enormis, B. furtiva, B. gammation ⟩⟨ B. verecundia, B. dentata, B. cenomanica ⟩⟨ B. ethmoquadrata ⟩⟨ B. signata, B. galloisii, B. matalosa, B. viriosa, B. sp.

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: axial cross and fine grill


Taxonomy:

Citation: Broinsonia ethmoquadrata Bukry, 1969
Rank: Species
Variants: Broinsonia staytonae Bukry, 1969 (cross structure curved and rotated)

Farinacci & Howe catalog pages: B. ethmoquadrata * , B. staytonae *

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: axial cross and fine grill


Morphology:


Size:

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, grill, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->7µm;
Data source notes: original descriptions & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Original description - so real range may be longer
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Original description - so real range may be longer

Plot of occurrence data:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O


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Broinsonia ethmoquadrata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-5-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10122 Go to Archive.is to create a permanent copy of this page - citation notes



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