/Globotruncana (Globotruncana) subspinosa/holotype illus-98.jpg)
Specimens which cannot be assigned to established species
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | Radotruncana calcarata | |
| | | Radotruncana subspinosa | |
| Radotruncana sp. Specimens which cannot be assigned to established species | ||||
Taxonomy
Original description: Subgenus of Plummerita (Family Globotruncanidae , subfamily Globotruncaninae) having later chambers radially elongate , clavate or tubulospinate, surface generally smooth to somewhat rugose, rugosities, when present not aligned in meridional pattern. Upper Campanian-Maastrichtian. Monotypic.
Entries in the Catalog of original descriptions: Plummerita (Radotruncana)
Distinguishing features:
Parent taxon (Globotruncanidae): Test trochospiral, chambers angular, periphery truncate or carinate; primary aperture umbilical, covered by a spiral system of tegilla that is provided with accessory intralaminal and infralaminal apertures.
This taxon: Test trochospiral, planocovex with flattened spiral side and strongly convex umbilical side, chambers rhomboidal in section, the five to seven chambers of the final whorl each with a tubulospine at the proximal end of the chamber and in the plane of the spiral surface, less frequently a tubulospine may arise at the junction of two adjacent chambers, tubulospines increasing in size and length by lamellar growth, so that earlier ones of the final whorl may be larger than the later ones, umbilicus wide, up to one-half the test diameter, sutures radial to curved, depressed to slightly elevated and may be nodose, periphery with a single keel, peripheral outline polygonal; wall calcareous, densely perforate, surface smooth or with pustules covering the surface of early whorls and present along the sutures and peripheral keel; primary aperture umbilical, bordered by a large flat porticus, those of successive chambers imbricated within the umbilicus and may partially fuse.
Geological Range:
Last occurrence (top): in mid part of Maastrichtian Stage (48% up, 69.2Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Campanian Stage (38% up, 79.2Ma, in Campanian stage). Data source: Total of range 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:
 |
Radotruncana compiled by the pforams@mikrotax project team viewed: 4-6-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=110485 Go to Archive.is to create a permanent copy of this page - citation notes |
Comments
(0)