pforams@mikrotax - Laeviheterohelix pforams@mikrotax - Laeviheterohelix


Classification: pf_mesozoic -> Heterohelicidae -> Laeviheterohelix
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)
Laeviheterohelix dentata

Laeviheterohelix flabelliformis

Laeviheterohelix glabrans

Laeviheterohelix pulchra

Laeviheterohelix reniformis

Laeviheterohelix turgida

Laeviheterohelix sp.
Specimens which cannot be assigned to established species


Citation: Laeviheterohelix Nederbragt, 1991
taxonomic rank: Genus

Original description: Diagnosis: Test calcareous, biserial throughout or with an initial planispiral coil; wall microperforate and smooth with scattered pustules, or with pores situated in the center of a pore mound. Aperture a simple arc, bordered by distinct flanges.

Entries in the Catalog of original descriptions: Laeviheterohelix

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: Biserial throughout, aperture symmetrically positioned, wall smooth, microperforate with irregularly scattered pustule or pore mounds

Geological Range:
Last occurrence (top): at top of A. mayaroensis zone (100% up, 67.6Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:


Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs


Laeviheterohelix compiled by the pforams@mikrotax project team viewed: 25-7-2024

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