Nannotax3 - ntax_mesozoic - Broinsonia gammation

Broinsonia gammation


Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia gammation
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: small (<5µm) species with perforate plate surrounding central cross


Taxonomy:

Citation: Broinsonia gammation Hill, 1976
Rank: Species

Farinacci & Howe catalog pages: B. gammation *

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: small (<5µm) species with perforate plate surrounding central cross


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
CA: placolith, grill, plate, pores,
Lith size: 4->5µm;
Data source notes: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: Original description - so real range may be longer
First occurrence (base): within Middle Albian Substage (107.59-110.22Ma, base in Albian stage). Data source: Original description - so real range may be longer

Plot of occurrence data:

References:

Hill, M. E. (1976). Lower Cretaceous calcareous nannofossils from Texas and Oklahoma. Palaeontographica Abteilung B Palaeophytologie. 156: 103-179. gs


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Broinsonia gammation compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-11-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10125 Go to Archive.is to create a permanent copy of this page - citation notes



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