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Origin and Evolution of the Foraminiferal Genus Orbulina d'Orbigny
W. H. Blow
Vol. 2, No. 1 (Jan., 1956), pp. 57-70
Published by: The Micropaleontology Project., Inc.
Stable URL: http://www.jstor.org/stable/1484492
Page Count: 14
You can always find the topics here!Topics: Brasses, Evolution, Holotypes, National museums, Biological taxonomies, New genus, Specimens, Species, Umbilicus, Circles
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This paper traces in detail the evolution of the genus Orbulina d'Orbigny from a species of Globigerinoides similar to Globigerinoides triloba. Two independent lines of evolution are discussed, the first leading to Orbulina universa, and the second to "Orbulina" bilobata. The latter species is removed to a new genus, Biorbulina, and two new species of Globigerinoides are proposed. The stratigraphic range of Orbulina in Trinidad and in Falcón, Venezuela, is discussed, and a preliminary correlation of the Oligo-Miocene sediments of the two areas is given.
Micropaleontology © 1956 The Micropaleontology Project., Inc.