pforams@mikrotax - Rectoguembelina

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

Taxonomy

Citation: Rectoguembelina Cushman, 1932
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.  


Emended description:


Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): near top of Danian Stage (85% up, 62.3Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Maastrichtian Stage (48% up, 69.2Ma, in Maastrichtian stage). Data source: Total of range of species in this database

Plot of range and occurrence data:

References:


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Rectoguembelina compiled by the pforams@mikrotax project team viewed: 25-5-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110489 Go to Archive.is to create a permanent copy of this page - citation notes



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