arrayname: original
Taxonomy
Original description: Test large, trochospiral, biconvex; periphery lobate, having a closely spaced double keel above the median line, becoming weaker and more closely spaced on the last and penultimate chambers; chambers smooth and overlapping dorsally, inflated ventrally, early chambers of last whorl rugose ventrally, later ones smooth; sutures curved, raised and thickened dorsally, ventrally depressed and radial; umbilicus narrow and deep; aperture interomarginal, umbilical. Some specimens exhibiting a weak ridge at the umbilical margin of early chambers of the last whorl formed by enlarged and coalescing pustules.
Entries in the Catalog of original descriptions: Globotruncana roddai
Character matrix
test outline: | Circular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical |
sp chamber shape: | Petaloid | coiling axis: | Very low | periphery: | Double keel | aperture border: | Thin porticus |
umb chbr shape: | Trapezoidal | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Strongly depressed | umb depth: | Deep | wall texture: | Smooth | shell porosity: | - |
umbilical or test sutures: | Strongly 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. concavata zone (85.60-89.75Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs Marianos, A. W. & Zingula, R. P. (1966). Cretaceous planktonic foraminifers from Dry Creek, Tehama County, California. Journal of Paleontology. 40: 328-343. gsReferences:
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Dicarinella roddai compiled by the pforams@mikrotax project team viewed: 25-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110095 Go to Archive.is to create a permanent copy of this page - citation notes |
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