Petrobrasiella bownii


Classification: Mesozoic -> hidden -> deleted -> Petrobrasiella bownii
Sister taxa: << < C. ocellatus, C. prinsii, C. deflandrei (morphotype A), C. deflandrei (morphotype B), C. asymmetricus, H. geometricus, M. bramlettei, N. erbae, Obliquipithonella, O. prasina, O. rhombica, Orthopithonella, O. geometrica, O. misurinae, P. fletcheri, P. bownii, P. geometrica, P. triassica subsp. punctata, P. triassica subsp. triassica, P. charlotteii, P. fistulatus, S. pseudobiskayae, S. gephyrion, S. acutiferrus, S. laffittei, Thoracosphaera, T. wombatensis, Z. sisyphus, W. communis, L. primigenius, C. crucifer> >>

Distinguishing features: Simialr to P. venata but with distinct base and lacking central core.


Taxonomy:

Citation: Petrobrasiella bownii Burnett 1997
Rank: Species

Farinacci & Howe catalog pages: P. bownii *

Distinguishing features: Simialr to P. venata but with distinct base and lacking central core.


Morphology: A form comprising a basal plate composed of elements which form an indistinct rim (probably a preservational feature) and a perforated distal part. The perforations are subhexagonal. In the LM, focusing on the distal part shows the reticulated nature of this. Focusing on the base, the perforations can be seen to extend into the core of the form. The LM side-view again reveals the extensive perforations and a coccolith-like base with a cavate central area. [Bunett 1997]

Search data:
TagsLITHS:
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Maastrichtian Substage (69.91-72.05Ma, top in Maastrichtian stage). Data source: original description
First occurrence (base): within Late Campanian Substage (72.05-76.38Ma, base in Campanian stage). Data source: original description

Plot of occurrence data:

References:

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O


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Petrobrasiella bownii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-11-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10895 Go to Archive.is to create a permanent copy of this page - citation notes



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