|Daughter taxa (time control age-window is: 0-800Ma)|
Specimens which cannot be assigned to established species
Original description: Translation from the Russian. -Test trochospiral. Dorsal side convex, ventral side concave. In the first whorl the chambers are rounded in outline, in later whorls they are flattened, crescentic in outline, with well elevated sutures. Umbilical region broad. Aperture interiomarginal, umbilical. Peripheral margin narrow with two keels.
Family Globotruncanidae. Upper Santonian to Maastrichtian.
Entries in the Catalog of original descriptions: Contusotruncana
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, with strongly convex spiral side, early chambers globular, later broad, low, and semilunate, with an undulating surface as seen from the spiral side, ovate from the umbilical side, sutures oblique, curved, thickened, elevated, and nodose on the spiral side, radial and depressed around the broad umbilicus that occupies up to one-half the test diameter on the flat to concave umbilical side, peripheral outline entire to lobulate, periphery with two very closely spaced keels separated by narrow imperforate carinal band and may be reduced to a single keel in the final few chambers; wall calcareous, finely perforate, radial, surface smooth between the elevated and nodose sutures and keel of the spiral side, finely pustulose on the umbilical side; aperture interiomarginal and umbilical, portici of successive apertures protruding obliquely into the umbilicus, with a distal accessory aperture beneath each porticus.
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): at top of Turonian Stage (97% up, 89.9Ma, in Turonian stage). Data source: Total of range of species in this database
Plot of range and occurrence data:
Korchagin, V. I. (1982). Систематика глоботрунканин - Systematics of the Globotruncanids. Byulletin Moskovskogo Obshchestva Ispytateley Prirody Otdel Geologicheskiy. 57(5): 114-121. gs Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs
Korchagin, V. I. (1982). Систематика глоботрунканин - Systematics of the Globotruncanids. Byulletin Moskovskogo Obshchestva Ispytateley Prirody Otdel Geologicheskiy. 57(5): 114-121. gs
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs
Contusotruncana compiled by the pforams@mikrotax project team viewed: 25-5-2022
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