Nannotax3 - ntax_mesozoic - Petrobrasiella bownii

Petrobrasiella bownii

Classification: ntax_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:

Tags	LITHS:
Metrics	Lith 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:

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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: deleted

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

Petrobrasiella bownii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-1-2021

Taxon Search:

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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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