pforams@mikrotax - Planoglobulina browni

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Planoglobulina browni

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

ODP Leg 174-189.JPG

Taxonomy

Citation: Planoglobulina browni (Martin, 1972)

Rank: Species

Basionym: Ventilabrella browni

Taxonomic discussion: Ventilabrella browni MARTIN (1972, p.85, pl.1, figs.1-2) is a junior synonym of Ventilabrella eggeri CUSHMAN 1928. [copied from Chronos database]

Type images:

holotype: V. browni
holotype: V. browni
paratype: V. browni

Original description: Test flabelliform, laterally compressed, with 6-8 subglobular chambers in biserial portion; up to 10 subglobular to pyriform chambers in multiserial portion. Longitudinal costae very heavy on biserial portion; costae finer and discontinuous on multiserial portion. Sutures indistinct, depressed. Arched, basal apertures on front and back of all but outermost chambers in final row; outermost chambers with apertures on front only, facing inward.

Entries in the Catalog of original descriptions: Ventilabrella browni

Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.20-84.19Ma, base in Santonian 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

Character matrix

test outline:	Palmate	chamber arrangement:	Multiserial	edge view:	Compressed	aperture:	Multiple
sp chamber shape:	Elongate	coiling axis:	N/A	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Elongate	umbilicus:	N/A	periph margin shape:	N/A	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	N/A	wall texture:	Meridional costellae	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Weakly depressed	final-whorl chambers:	6.0-10.0	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

Planoglobulina browni compiled by the pforams@mikrotax project team viewed: 21-4-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110393 Go to Archive.is to create a permanent copy of this page - citation notes

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