pforams@mikrotax - Rectoguembelina pforams@mikrotax - Rectoguembelina


Classification: pf_mesozoic -> Heterohelicidae -> Rectoguembelina
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)
Rectoguembelina cretacea

Rectoguembelina sp.
Specimens which cannot be assigned to established species


Citation: Rectoguembelina Cushman, 1932
taxonomic rank: Genus

Original description: Test with the early chambers arranged in a biserial manner similar to Guembelina, later chambers uniserial and rounded in transverse section; chambers all inflated, distinct; sutures distinct, depressed; wall calcareous, thin, very finely perforate; aperture in the early stages similar to Guembelina, in the adult terminal, rounded, with a distinct neck.

Entries in the Catalog of original descriptions: Rectoguembelina

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: Initially biserial, later part of test uniserial, globular chambers throughout.  

Geological Range:
Last occurrence (top): at top of P2 zone (100% up, 62.3Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:



Rectoguembelina compiled by the pforams@mikrotax project team viewed: 15-6-2024

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