pforams@mikrotax - Planoglobulina riograndensis

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.


Citation: Planoglobulina riograndensis (Martin, 1972)
Rank: Species
Basionym: Ventilabrella riograndensis

Type images:

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

Emended description:

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.

Wall type:


Character matrix
test outline:Palmatechamber arrangement:Multiserialedge view:Compressedaperture:Multiple
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:-
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-8.0 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 R. calcarata zone (75.71-76.18Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


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: 2-12-2022

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