Marginotruncana pseudolinneiana

Taxonomy

Original description: "Test lobate, trochospiral; extremely planiform, often concave spirally; planiform umbilically; peripherally truncated by a wide double keel; rims of double keel either not strongly beaded or beadless. Test comprised of 2.5 to 3 whorls of chambers which gradually expand in size; 7-8 chambers in final whorl. Chambers crescent-shaped spirally, separated by raised, curved, slightly beaded or beadless sutures; chambers subrectangular umbilically, separated by slightly curved, raised, beadless or slightly beaded sutures. Umbilicus broad, bordered by mildly elevated umbilical shoulder. Primary aperture interiomarginal, extraumbilical-umbilical in position, a lowly arched opening. Outer wall except for double keel radial hyaline, perforate; double keel radial hyaline, imperforate. Septal walls microgranular hyaline, sparsely perforate."

Entries in the Catalog of original descriptions: Marginotruncana pseudolinneiana, Marginotruncana scorpionis, Globotruncana loeblichi

Geological Range:
Last occurrence (top): within G. elevata zone (79.33-83.65Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian 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: Marginotruncana pseudolinneiana, synonyms included - Globotruncana pseudolinneiana; Marginotruncana pseudolinneiana; Marginotruncana pseudolinneiana juvenile;
• See also space-time plot :: Samples map :: Parent: Marginotruncana

Marginotruncana pseudolinneiana compiled by the pforams@mikrotax project team viewed: 17-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110337 Go to Archive.is to create a permanent copy of this page - citation notes

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