Praeglobotruncana inermis

Taxonomy

Original description: Diagnosis.-A high trochospiral species of Praeglobotruncana with slight peripheral pustule lines, distinct lip near umbilicus and 4 smooth-walled chambers in last whorl.

Description.- Test of medium to large size, medium to high trochospiral, equatorial periphery lobulate ; chambers petaloidal in shape on dorsal side, trapezoidal to subglobular, inflated on dorsal side, about 12 in all arranged into 2 to 2.5 whorls, enlarging gradually in size as added, characteristically 4 chambers in final whorl, with a weak peripheral band formed of an aligned concentration of pustules which tends to be shifted toward spiral side ; final chamber shifted toward umbilical direction ; sutures on dorsal side radial and depressed except for that of first chamber in last whorl which occasionally is raised, ventrally radial and depressed; umbilicus shallow, medium to narrow in size, less than 1/4 of maximum diameter of test; primary aperture bordered by a distinct lip that expands markedly near umbilicus, interiomarginal, umbilical- extraumbilical ; wall calcareous, surface smooth, earlier chambers weakly pustulated

Entries in the Catalog of original descriptions: Praeglobotruncana inermis

Emended description:

Geological Range:
Last occurrence (top): within Turonian Stage (89.39-93.90Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian 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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Praeglobotruncana

Praeglobotruncana inermis compiled by the pforams@mikrotax project team viewed: 7-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110432 Go to Archive.is to create a permanent copy of this page - citation notes

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