Praeorbulina

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Praeorbulina
Sister taxa: Beella, Catapsydrax, Clavatorella, Globigerina, Globigerinella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Orcadia, Paragloborotalia, Praeorbulina, Protentella, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita,
Daughter taxa (blue => in age window 0-300Ma)



Taxonomy

Citation: Praeorbulina Olsson 1964
Rank: genus
Type species: Globigerinoides glomerosa glomerosa Blow 1956
Taxonomic discussion: Olsson (1964) proposed the genus Praeorbulina to include intermediate morphological stages connecting Globigerinoides sicanus with Orbulina universa. The species and subspecies now referred to as Praeorbulina were originally included in the genus Globigerinoides (Blow, 1956) and later placed in Porticulasphaera (Bolli, 1957b; Blow, 1959). Praeorbulina differs from Orbulina by the lack of areal apertures and from Globigerinoides in lacking a distinct umbilicus and an umbilical aperture in the adult stage. Lipps (1964) considered Praeorbulina Olsson as a junior synonym of Candorbulina.

Catalog entries: Praeorbulina;

Type images:

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Langhian Stage (13.82-15.97Ma, top in Langhian stage). Data source: Total of range of species in this database
First occurrence (base): within Burdigalian Stage (15.97-20.44Ma, base in Burdigalian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.81

References:

Blow, W.H., (1956). Origin and evolution of the foraminiferal genus Orbulina d'Orbigny. Micropaleontology, 2(1): 57-70.

Blow, W.H., (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology, 39(178): 67-251.

Bolli, H.M., (1957). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 155-172.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Lipps, J.H., (1964). Miocene planktonic foraminifera from Newport Bay, California. Tulane Studies in Geology and Paleontology, 2: 109-133.

Olsson, R.K., (1964). Late Cretaceous planktonic Foraminifera from New Jersey and Delaware. Micropaleontology, 10(2): 157-188.


Praeorbulina compiled by the pforams@mikrotax project team viewed: 24-3-2017

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