Praeglobotruncana compressa

Taxonomy

Original description: Diagnosis.- A low trochospral species of Praeglobotruncana with compressed and wedge- shaped chambers in last whorl.

Description.-Test of medium to small size, very low trochospiral, equatorial periphery slightly lobulate; chambers wedge-shaped on dorsal side, triangular and slightly inflated on ventral side, about 10 chanbers in all, enlarging rapidly in size as added, about 4.5 chambers in last whorl, with a peripheral band formed of aligned pustules; final chamber occasionally obliquely shifted toward umbilical direction; chambers in last whorl diagnostically elongated toward spiral direction; sutures on dorsal side gently curved, depressed, ventrally radial or slightly curved and depressed; umbilicus shallow, medium in size, about 1/3-1/4 of maximum diameter of test, umbilical flaps extending into an umbilicus from each chamber; primary aperture bordered by a narrow lip, interiomarginal, umbilical-extraumbilical; wall calcareous, earlier chambers pustulated.

Entries in the Catalog of original descriptions: Praeglobotruncana compressa

Geological Range:
Last occurrence (top): in lower part of H. helvetica zone (30% up, 93.2Ma, in Turonian stage). Data source:
First occurrence (base): in upper part of R. cushmani zone (80% up, 95Ma, in Cenomanian stage). Data source:

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 compressa 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=110428 Go to Archive.is to create a permanent copy of this page - citation notes

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