Taxonomy
Original description: Test of medium size, periphery slightly to distinctly lobate with one double keel or two very close keels. Spiral side flat to very slightly concave; sutures curved, limbate; generally 6 chambers in the last whorl, increasing regularly. Umbilical side with wide umbilicus; generally 6 moderately inflated chambers visible.
Entries in the Catalog of original descriptions: Globotruncana (Globotruncana) ventricosa primitiva, Globotruncana kuepperi
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | - |
sp chamber shape: | Petaloid | coiling axis: | Low-moderate | periphery: | Double keel | aperture border: | Thin porticus |
umb chbr shape: | Trapezoidal | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Finely pustulose | 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. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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Dicarinella primitiva compiled by the pforams@mikrotax project team viewed: 25-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110094 Go to Archive.is to create a permanent copy of this page - citation notes |
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