Abathomphalus intermedius

Taxonomy

Original description: The test is usually slightly convex on the dorsal side, flat or often slightly convex ventrally, and distinctly lobate, but this is less pronounced than in G. citae. The five, occasionally four, chambers of the last whorl usually possess a marked peripheral edge or keel, and sometimes a second keel is developed (transition to G. mayaroensis). The sutures on the dorsal side are distinctly curved, whereas ventrally they are radial. The chambers often appear slightly inflated and a few show striations, which are radial on the ventral side and more tangential dorsally. The state of preservation of the specimens so far examined has not allowed detailed study of the aperture or apertures, which probably open into the umbilicus.

Entries in the Catalog of original descriptions: Globotruncana intermedia, Globotruncana intermedia difformis, Globotruncana hanzawai, Globotruncana pessagnoi

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.64Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian 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: Abathomphalus intermedius, synonyms included - Abathomphalus difformis; Abathomphalus hanzawai; Abathomphalus intermedius; Globotruncana difformis; Globotruncana hanzawae; Globotruncana intermedia; Globotruncana intermedia difformis; Globotruncana pessagnoi; Marginotruncana difformis;
• See also space-time plot :: Samples map :: Parent: Abathomphalus

Abathomphalus intermedius compiled by the pforams@mikrotax project team viewed: 14-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110002 Go to Archive.is to create a permanent copy of this page - citation notes

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