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Planoglobulina brazoensis


Classification: pf_mesozoic -> Heterohelicidae -> Planoglobulina -> Planoglobulina brazoensis
Sister taxa: P. acervulinoides, P. brazoensis, P. browni, P. carseyae, P. manuelensis, P. multicamerata, P. riograndensis, P. sp.

Taxonomy

Citation: Planoglobulina brazoensis Martin 1972
Rank: Species
Basionym: Planoglobulina brazoensis

Type images:

Original description: Test flabelliform, inflated, especially in early portion. Six rapidly expanding chambers in biserial portion; 10 inflated, globular chambers in multiserial portion. Sutures fairly distinct, depressed. Coarse, discontinuous, longitudinal costae over entire test, separated by 2 or more rows of randomly arranged pores; costae somewhat finer on last row of chambers. Arched, basal apertures on front and back of all but outermost chambers in the last row; outermost chambers with apertures on front only, facing inward.

Entries in the Catalog of original descriptions: Planoglobulina brazoensis

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. gansseri zone (71.75-72.97Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Multiple
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Coarsely costateshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Martin, S. E. (1972). Reexamination of the Upper Cretaceous planktonic foraminifera genera Planoglobulina and Ventilabrella Cushman. Journal of Foraminiferal Research. 2(2): 73-92. gs

Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs V O


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Planoglobulina brazoensis compiled by the pforams@mikrotax project team viewed: 5-3-2021

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110392 Go to Archive.is to create a permanent copy of this page - citation notes



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