Laeviheterohelix glabrans

Taxonomy

Original description: Test nearly twice as long as broad, tapering, throughout, much compressed, early portion with the periphery entire and slightly keeled, later moderatly indented; chambers in the microspheric form mostly slightly broader than high, in the megalospheric form with the later chambers with the height often as great or greater than the breadth, later ones more inflated but somewhat compressed throughout; sutures in the early portion slightly limbate, in the adult depressed; wall in the early portion coarsely punctulate, somewhat roughened, in the adult smooth and polished; aperture higher than broad, arched with a slight lip and flanges at the sides extending onto the preceding chamber.

Entries in the Catalog of original descriptions: Guembelina glabrans

Most likely ancestor: Laeviheterohelix pulchra - at confidence level 3 (out of 5). Data source: Nederbragt 1991.

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74.00-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Laeviheterohelix glabrans, synonyms included - Heterohelix glabrans; Heterohelix glabrons; Laeviheterohelix glabrans;
• See also space-time plot :: Samples map :: Parent: Laeviheterohelix

Laeviheterohelix glabrans compiled by the pforams@mikrotax project team viewed: 11-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110303 Go to Archive.is to create a permanent copy of this page - citation notes

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