Daughter taxa (time control age-window is: 0-800Ma) | ||||
Rugotruncana circumnodifer | ||||
Rugotruncana nothi | ||||
Rugotruncana subcircumnodifer | ||||
Rugotruncana sp. Specimens which cannot be assigned to established species |
Taxonomy
Original description: The calcareous hyaline test is trochospirally coiled. The small early chambers are globular, inflated, and globigerine-like. Later chambers are very slightly to strongly flattened and exhibit a keeled, imperiorate, peripheral band. The early chambers are smooth walled, but some or all later chambers exhibit fine discontinuous costellae or traces of costellae. The principal aperture is rounded, interiomarginal, and opens into a relatively large umbilicus. Long apertural flaps 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
Distinguishing features:
Parent taxon (Rugoglobigerinidae): Test trochospiral, chambers inflated, periphery rounded, not carinate; wall with pustules, costellae, or other rugosities; aperture umbilical, with portici or tegilla.
This taxon: Test with a low trochospiral coil, early chambers subglobular and inflated, later chambers slightly compressed, sutures curved on the spiral side and continuous with the peripheral carina, straight, radial, and depressed on the umbilical side, umbilicus wide, periphery with double-keeled imperforate carinal band; wall calcareous, finely perforate, surface strongly pustulose, adjacent pustules may coalesce into short costellae without distinct alignment, although resulting in a rugose surface; primary aperture interiomarginal, umbilical, elongate portici in the early chambers, later with distinctly protruding tegilla provided with accessory apertures.
Geological Range:
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within R. calcarata zone (75.06-75.91Ma, base in Campanian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gsReferences:
Rugotruncana compiled by the pforams@mikrotax project team viewed: 10-12-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110509 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
The taxonomic discussion states that G. tilevi remains the correct name for the type species of Rugotruncana but it is included in the synonyms of G. circumnodifer?
Indeed, I will point his out to Brian