Taxonomy
Original description: "Test lobulate, biumbilicate, planispirally coiled with 6-8 chambers in last whorl; initial chambers spherical, later chambers ovoid, gradually increasing in size; ornamentation consisting of medium-sized papillae; sutures straight, radial, and depressed; umbilici large and deep; aperture equatorial, a low semicircular opening leading into both umbilical areas from base of last chamber; last chamber frequently compressed or variously distorted."
Entries in the Catalog of original descriptions: Planomalina yaucoensis, Planomalina ehrenbergi
Character matrix
test outline: | Lobate | chamber arrangement: | Planispiral | edge view: | Hourglass | aperture: | Equatorial |
sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | Relict |
spiral sutures: | Strongly depressed | umb depth: | Shallow | wall texture: | Finely pustulose | shell porosity: | - |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 7-8 | N.B. These characters are used for advanced search. N/A - not applicable |
Most likely ancestor: Planohedbergella prairiehillensis - at confidence level 3 (out of 5). Data source: Huber et al. 2022 fig. 2.
Likely descendants: Planohedbergella circularis;
plot with descendants
Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: Huber et al. 2022
Plot of range and occurrence data:
Huber, B. T., Petrizzo, M. M. & Falzoni, F. (2022b). Taxonomy and phylogeny of Albian–Maastrichtian planispiral planktonic foraminifera traditionally assigned to Globigerinelloides. Micropaleontology. 68(2): 117-183. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs OReferences:
Planohedbergella yaucoensis compiled by the pforams@mikrotax project team viewed: 14-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110150 Go to Archive.is to create a permanent copy of this page - citation notes |
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