Taxonomy
Globotruncana subpennyi = Rugotruncana subpennyi
Rugotruncana ellisi;
Rugotruncana tilevi;
Globotruncana rugosa subrugosa
Original description: "Large, loosely coiled, 4 chambers per coil, about 2 coils visible dorsally, ventrally nearly involute; spire flatly depressed, second coil more descending, chambers sub-globular, smooth, shining above and below but with faint peripheral sulcus margined by low nodules increasing in extent posteriorly to cover most of early chambers; umbilicus widely open, about one-third of shell diameter, aperture opening laterally into it, apertures of all ventral chambers probably visible if matrix absent. Size, 0.47 mm. Evidently a close relative of the abundant Navarro Globigerina rugosa Plummer, which has 5 chambers per coil and more ornament of a different character. It is a moot point whether these are not Globotruncana, as they differ only in the absence of keels and feebler sculpture"
Entries in the Catalog of original descriptions: Globigerina circumnodifer, Globotruncana (Rugoglobigerina) ornata subornata, Globotruncana (Rugoglobigerina) pennyi subpennyi, Rugotruncana ellisi, Rugotruncana tilevi, Globotruncana rugosa subrugosa
Emended description:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
sp chamber shape: | Inflated | coiling axis: | Low | periphery: | Double keel | aperture border: | Tegilla |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Moderately rounded | accessory apertures: | Infralaminal |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Meridional costellae | shell porosity: | - |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.5-5.5 | 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:
Finlay, H. J. (1940). New Zealand foraminifera: Key species in stratigraphy - no. 4. Transactions of the Royal Society of New Zealand. 69(4): 448-472. gsReferences:
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Rugotruncana circumnodifer compiled by the pforams@mikrotax project team viewed: 14-2-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110510 Go to Archive.is to create a permanent copy of this page - citation notes |
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