pforams@mikrotax - Planoglobulina riograndensis

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Planoglobulina riograndensis

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

ODP Site 1049-193.JPG
ODP Site 1052-193.JPG

Taxonomy

Citation: Planoglobulina riograndensis (Martin, 1972)

Rank: Species

Basionym: Ventilabrella riograndensis

Type images:

holotype: V. riograndensis
holotype: V. riograndensis
paratype: V. riograndensis
paratype: V. riograndensis
paratype: V. riograndensis

Original description: Test flabelliform, slightly compressed; Eight chambers in biserial portion; twenty-two chambers in multiserial portion. Chambers globular to pyriform. Sutures distinct, depressed. Fine, discontinuous segments of longitudinal costae cover majority of test, rearranging into a vermicular pattern on early chambers. Arched, basal apertures on front and back of all but outermost chambers in multiserial portion; outermost chambers usually with apertures on front only, facing inward.

Entries in the Catalog of original descriptions: Ventilabrella riograndensis

Morphology: Biserial chambers rapidly expanding in size; followed by up to 5 multiserial sets; surface covered with fine vermicular ornamentation; last set of chamberlets usually covered with fine, discontinuous costae.

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 R. calcarata zone (75.71-76.18Ma, 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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Planoglobulina riograndensis, synonyms included - Planoglobulina riograndensis;
See also space-time plot :: Samples map :: Parent: Planoglobulina

Character matrix

test outline:	Palmate	chamber arrangement:	Multiserial	edge view:	Compressed	aperture:	Multiple
sp chamber shape:	Inflated	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin flange
umb chbr shape:	Inflated	umbilicus:	N/A	periph margin shape:	Moderately rounded	accessory apertures:	N/A
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Finely costate	shell porosity:	-
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	5.0-8.0	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 riograndensis compiled by the pforams@mikrotax project team viewed: 2-3-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110397 Go to Archive.is to create a permanent copy of this page - citation notes

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