Taxonomy
Original description: "Test trochospiral coiled, biconvex to moderately convex ventrally and slightly convex dorsally. Umbilicus large, often flanked by a beaded margin. Sutures straight to slightly curved dorsally, moderately curved ventrally, usually heavily beaded. Chambers more or less angular rhombohedral in shape; 6-7 chambers in last whorl; dorsal surface of chambers sometimes crenulate. Periphery single-keeled, usually quite lobulate. Wall calcareous, finely perforate. Primary aperture interiomarginal, umbilical."
Entries in the Catalog of original descriptions: Globotruncana (Globotruncana) subspinosa
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical |
| sp chamber shape: | Petaloid | coiling axis: | Very low | periphery: | Single keel | aperture border: | Coalescing portici |
| umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | Intralaminal |
| 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 R. fructicosa zone (69.27-70.14Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. ventricosa zone (76.18-79.20Ma, base in Campanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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Radotruncana subspinosa compiled by the pforams@mikrotax project team viewed: 7-10-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110488 Go to Archive.is to create a permanent copy of this page - citation notes |
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