arrayname: original
Taxonomy
Original description: Diagnosis, - Test low trochospiral, nearly flat on spiral side, covered with coarse oriented pustulae, especially on first chambers on the last whorl. The ultimate chamber is smooth. Chambers globular, 5 to 5 and one-half in final whorl, increasing gradually in size, the last chamber increasing very rapidly, giving the test its specific appearance. Umbilicus wide. Primary aperture interiomarginal, umbilical to extraumbilical, bordered by an apertural flap. Greatest diameter of holotype 400 microns, of topotypes 350 microns.
Entries in the Catalog of original descriptions: Hedbergella angolae
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Compressed | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Globular | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Globular | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | Relict |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 5-5.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within T. reicheli zone (98.69-98.85Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. primula zone (107.39-111.84Ma, base in Albian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Caron, M. (1978). Cretaceous planktonic foraminifera from DSDP Leg 40, southeastern Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 651-678. gs References:
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Muricohedbergella angolae compiled by the pforams@mikrotax project team viewed: 22-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110359 Go to Archive.is to create a permanent copy of this page - citation notes |
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