Nannotax3 - ntax_mesozoic - Broinsonia dentata Nannotax3 - ntax_mesozoic - Broinsonia dentata

Broinsonia dentata


Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia dentata
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 with lateral bars


Taxonomy:

Citation: Broinsonia dentata Bukry, 1969
taxonomic rank: Species
Variants: Hattner & Wise (1980) argued that B. handfieldi should be considered a synonym of B. dentata since tapering of the longitudinal crossbars varies continuously within assemblages.
Taxonomic discussion: B. dentata and B. cenomanica are very similar but have different ranges - Campanian vs. Albian to Mid Cenomanian and B. cenomanica has a spine base (and presumably originally a spine). 

Farinacci & Howe catalog pages: B. dentata * , B. handfieldii * , B. orthocancellata *

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 with lateral bars

Search data:
LITHS: placolith, elliptical, CA: cross-axial, grill, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic,
Lith size: 6->10µm;
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 (72.17-83.65Ma, top in Campanian stage). Data source: Burnett 1998
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: Burnett 1998

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

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Hattner, J. G. & Wise, S. W. (1980). Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. South Carolina Geology. 24: 41-117. gs

Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs O

Salomon, R. (1999). The Calcite Palace. Website - https://ina.tmsoc.org/galleries/CalcitePalace/index.htm. -. gs

Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs O

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Broinsonia dentata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-10-2024

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