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Globotruncana


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncana
Sister taxa: Abathomphalus, Contusotruncana, Dicarinella, Gansserina, Globotruncana, Globotruncanella, Globotruncanita, Loeblichella, Marginotruncana, Radotruncana,
Daughter taxa: (blue => in age window 0-800Ma)















Specimens which cannot be assigned to established species

Taxonomy

Citation: Globotruncana Cushman 1927
Rank: Genus
Basionym: Pulvinulina arca
Type species: Pulvinulina arca Cushman, 1926
Synonyms:

Original description: Test trochoid, the adult usually much compressed, the dorsal and ventral sides e ither flat or convex, ventral s ide sometimes slightly concave, the periphery truncate, usuall y with a double keel on the dorsal and ventral sides; aperntre on the ventral side; appare ntly pelagic in part.

Entries in the Catalog of original descriptions: Globotruncana, Rosalinella

Distinguishing features: Test high to low trochospiral, umbilicus occupying from one-fourth to one-half the diameter of the flat to concave umbilical side, peripheral margin truncate and bicarinate, keels separated by an imperforate carinal band, keel on the umbilical side less well developed and may be absent from the final few chambers, peripheral outline entire to lobulate; wall calcareous, finely perforate, surface generally smooth on the spiral side, may be pustulose on the umbilical side, particularly on the earlier chambers, sutures curved to straight, elevated on the spiral side and depressed, flush, or elevated on the umbilical side; primary aperture interiomarginal and umbilical, may be bordered by portici in the early stage, later or always with a system of tegilla that cover most of the umbilicus and have both proximal and distal accessory apertures.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

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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Globotruncana compiled by the pforams@mikrotax project team viewed: 19-9-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110152 Go to Archive.is to create a permanent copy of this page - citation notes



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