pforams@mikrotax - Laeviheterohelix

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

Taxonomy

Citation: Laeviheterohelix Nederbragt, 1991
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


Emended description:


Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): in upper part of Maastrichtian Stage (79% up, 67.3Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): near base of Turonian Stage (9% up, 93.5Ma, in Turonian stage). Data source: Total of range of species in this database

Plot of range and occurrence data:

References:

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


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Laeviheterohelix compiled by the pforams@mikrotax project team viewed: 20-5-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110300 Go to Archive.is to create a permanent copy of this page - citation notes



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