pforams@mikrotax - Rugotruncana nothi pforams@mikrotax - Rugotruncana nothi

Rugotruncana nothi

Classification: pf_mesozoic -> Rugoglobigerinidae -> Rugotruncana -> Rugotruncana nothi
Sister taxa: R. circumnodifer, R. nothi, R. subcircumnodifer, R. sp.


Citation: Rugotruncana nothi Bronnimann and Brown 1956
taxonomic rank: Species
Basionym: Rugotruncana nothi
Taxonomic discussion: Holotype image is terrible in online E+M catalogue. [copied from Chronos database]

Type images:

Original description: The low trochospirally coiled test is covered with fine spines, pustules, and costellae. Its small early chambers are inflated and globirgerine-like. Its later chambers are moderately flattened both dorsally and ventrally. The last whorl is deeply notched and composed of six or seven overlapping chambers. All later chambers exhibit a double-keeled, imperforate, peripheral band. The two strongly spinose keels are parallel and close together at the posterior part of each of the later chambers but become sharply divergent toward the anterior part. The principal aperture is rounded, interiomarginal, and opens into a rather large umbilicus. Long apertural falps extend into the umbilicus, and in later chambers form a protruded, imperforate, umbilical cover-plate with accessory apertures.

Entries in the Catalog of original descriptions: Rugotruncana nothi

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
sp chamber shape:Petaloidcoiling axis:Very lowperiphery:Double keelaperture border:Tegilla
umb chbr shape:Petaloidumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely costateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6-7 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 A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Brönnimann, P. & Brown, N. K. (1956). Taxonomy of the Globotruncanidae. Eclogae Geologicae Helvetiae. 48: 503-562. gs O

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O


Rugotruncana nothi compiled by the pforams@mikrotax project team viewed: 2-3-2024

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!