pforams@mikrotax - Radotruncana pforams@mikrotax - Radotruncana

Radotruncana


Classification: pf_mesozoic -> Globotruncanidae -> Radotruncana
Sister taxa: Abathomphalus, Contusotruncana, Dicarinella, Gansserina, Globotruncana, Globotruncanella, Globotruncanita, Loeblichella, Marginotruncana, Radotruncana
Daughter taxa (time control age-window is: 0-800Ma)
Radotruncana calcarata

Radotruncana subspinosa

Radotruncana sp.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Radotruncana El-Naggar 1971
taxonomic rank: Genus
Type species: Globotruncana calcarata Cushman, 1927

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): at top of R. fructicosa zone (100% up, 69.3Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within G. ventricosa zone (76.18-79.20Ma, base in Campanian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


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Radotruncana compiled by the pforams@mikrotax project team viewed: 25-6-2024

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