pforams@mikrotax - Planoglobulina

pforams@mikrotax - Planoglobulina pforams@mikrotax - Planoglobulina

Planoglobulina

Classification: pf_mesozoic -> Heterohelicidae -> Planoglobulina
Sister taxa: Heterohelix, Spiroplecta ⟩⟨ Braunella, Hendersonites, Huberella, Laeviheterohelix, Planoheterohelix, Protoheterohelix, Pseudoguembelina, Pseudotextularia ⟩⟨ Planoglobulina, Ventilabrella, Gublerina, Praegublerina, Sigalia, Racemiguembelina ⟩⟨ Lunatriella, Rectoguembelina, Zeauvigerina

Daughter taxa (time control age-window is: 0-800Ma)
			Planoglobulina acervulinoides
			Planoglobulina brazoensis
			Planoglobulina browni
			Planoglobulina carseyae
			Planoglobulina manuelensis
			Planoglobulina multicamerata
			Planoglobulina riograndensis
			Planoglobulina sp. Specimens which cannot be assigned to established species

Taxonomy

Citation: Planoglobulina Cushman 1927

taxonomic rank: Genus

Type species: Guembelina acervulinoides Egger, 1902

Taxonomic discussion: A neotype (USNM 170316) was designated for Planoglobulina acervulinoides (Egger) from the type locality by S. E. Martin, 1972 (*2051), p. 81.

Original description: Test with the earliest chambers in the microspheric form planospiral, followed by a series arranged biserially and in the adult by a series ofglobular chambers spread out fan shaped or even partially extending back toward the earlier chambers on either side, the later chambers in a single plane; wall calcareous, perforate.

Entries in the Catalog of original descriptions: Planoglobulina

Distinguishing features:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Test flabelliform, biserial stage followed by a proliferation of chambers in the same plane. Medium to coarse costae.

Morphology:

Test flabelliform, early biserial stage with rapidly enlarging chambers followed by a proliferation of chambers in the same plane, chambers inflated, subglobular, sutures distinct, depressed; wall calcareous, hyaline, perforate, surface with medium to coarse but discontinuous longitudinal costae that parallel the margins of the chambers, lateral cameral flanges with bordering rims may merge and become continuous ridges on the later chambers; arched basal apertures in the adult commonly at both sides of the multiseriate chambers.

Geological Range:
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within G. elevata zone (79.33-83.65Ma, base in Campanian stage). Data source: Total of ranges of species in this 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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Heterohelicidae

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs

Planoglobulina compiled by the pforams@mikrotax project team viewed: 16-10-2024

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