Taxonomy
Original description: "Test subcircular, flat dorsally, strongly convex on the ventral side, single-keeled; the chambers increase slightly in size, are curved and overlapping, as in Globotruncana rosetta (Carsey) subsp. rosetta (Carsey) (Globigerina rosetta, 1926). They are strongly convex ventrally, flat andeven concave dorsally. The sutural elevations are thin, well defined and sharply raised. The ventral convexity of the chambers can be so strong as to give in typical specimens a trunco-conical profile (side wall nearly at right angles with the roof of the chambes)."
Entries in the Catalog of original descriptions: Globotruncana rosetta pettersi
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical |
| sp chamber shape: | Subtriangular | coiling axis: | Very low | periphery: | Single keel | aperture border: | Thin porticus |
| umb chbr shape: | Trapezoidal | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Infralaminal |
| spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | - |
| umbilical or test sutures: | Raised beaded | final-whorl chambers: | 4-5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
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 G. gansseri zone (71.73-73.80Ma, base in Campanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
![]() |
Globotruncanita pettersi compiled by the pforams@mikrotax project team viewed: 18-7-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110195 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