pforams@mikrotax - Planoglobulina brazoensis

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.

Smith and Pessagno 1973_4f8-10-188.JPG
Smith and Pessagno 1973_5f1-2-188.JPG
ODP Site 1049-188~a.JPG
Martin 1972_3f7-188.JPG

Taxonomy

Citation: Planoglobulina brazoensis Martin 1972

Rank: Species

Basionym: Planoglobulina brazoensis

Type images:

holotype: P. brazoensis
holotype: P. brazoensis
paratype: P. brazoensis
paratype: P. brazoensis

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

Emended description:

Morphology:

Wall type:

Size:

Character matrix
test outline: Subtriangular chamber arrangement: Multiserial edge view: Compressed aperture: Multiple
sp chamber shape: Globular coiling axis: N/A periphery: N/A aperture border: Thin flange
umb chbr shape: Globular umbilicus: N/A periph margin shape: Broadly rounded accessory apertures: N/A
spiral sutures: Moderately depressed umb depth: N/A wall texture: Coarsely costate shell porosity:
umbilical or test sutures: Moderately depressed final-whorl chambers: 4.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

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:

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: Planoglobulina

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

Planoglobulina brazoensis compiled by the pforams@mikrotax project team viewed: 28-9-2022

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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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test outline:	Subtriangular	chamber arrangement:	Multiserial	edge view:	Compressed	aperture:	Multiple
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin flange
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Broadly rounded	accessory apertures:	N/A
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Coarsely costate	shell porosity:
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.0-6.0	N.B. These characters are used for advanced search. N/A - not applicable