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
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. gsReferences:
Laeviheterohelix compiled by the pforams@mikrotax project team viewed: 13-10-2024
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 |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments