Contusotruncana

Daughter taxa (time control age-window is: 0-800Ma)
			Contusotruncana contusa
			Contusotruncana fornicata
			Contusotruncana morozovae
			Contusotruncana patelliformis
			Contusotruncana plicata
			Contusotruncana plummerae
			Contusotruncana walfischensis
			Contusotruncana sp. Specimens which cannot be assigned to established species

Taxonomy

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

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, 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.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within D. concavata zone (85.60-89.75Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Globotruncanidae

Contusotruncana compiled by the pforams@mikrotax project team viewed: 13-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110067 Go to Archive.is to create a permanent copy of this page - citation notes

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