Taxonomy
Original description: Shape of test low trochospiral, equatorial periphery lobate. Wall calcareous, finely perforate. Chambers spherical in early stage, becoming slightly compressed laterally in the final whorl, giving the test a thick appearance. Approximately 15 chambers arranged in about 3 whorls. The 5 chambers of the last whorl increase moderately in size. Sutures radial, depressed on spiral and umbilical side. Umbilicus narrow, deep. Aperture a low arch, interiomarginal, umbilical-extraumbilical. Coiling random.
Entries in the Catalog of original descriptions: Praeglobotruncana crassa
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical-extraumbilical |
| sp chamber shape: | Inflated | coiling axis: | Very low | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | Relict |
| spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 5-6 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geological Range:
Last occurrence (top): within D. concavata zone (85.60-89.75Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Bolli, H. M. (1959c). Planktonic foraminifera from the Cretaceous of Trinidad, B. W. I. Bulletins of American Paleontology. 39(179): 253-277. gsReferences:

![]() |
Muricohedbergella crassa compiled by the pforams@mikrotax project team viewed: 10-9-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110363 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments