Praeorbulina glomerosa


Classification: pf_cenozoic -> Globigerinidae -> Praeorbulina -> Praeorbulina glomerosa
Sister taxa: P. circularis, P. glomerosa, P. curva, P. sp.,

Taxonomy

Citation: Praeorbulina glomerosa (Blow 1956)
Rank: species
Basionym: Globigerinoides glomerosa glomerosa Blow 1956

Catalog entries: Globigerinoides glomerosa glomerosa

Type images:

Distinguishing features: Test ovoid to nearly spherical; last chamber enveloping >40% of the earlier test; sutural apertures small crescentic and slitlike

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters: Subspherical to spherical

Aperture: Several small cresentric and slit-like openings along basal suture [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test ovoid to nearly spherical, chambers spherical, last chambers increasing rapidly in size; final chamber much inflated and enveloping the earlier part of the test up to more than 40 percent; sutures curved depressed; surface distinctly cancellate; primary aperture of the early portion covered by the last embracing chamber; several small crescentic and slitlike openings along the basal suture. [Kennett & Srinivasan 1983]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Moderateperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Sutural
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:1.0-3.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to temperate. [Kennett & Srinivasan 1983] Low to middle latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂13C and relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (1997a)

Phylogenetic relations: Pr. glomerosa glomerosa differs from Pr. glomerosa curva in having a more enveloping final chamber and more numerous supplementary sutural apertures. It is an intermediate from between Pr. glomerosa curva and Pr. glomerosa circularis. [Kennett & Srinivasan 1983]

Most likely ancestor: Praeorbulina curva - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 11.
Likely descendants: Praeorbulina circularis;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N9 zone (14.24-15.10Ma, top in Langhian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): at base of M5b subzone (0% up, 16.3Ma, in Burdigalian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.82

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

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

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

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

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1997a). Stable isotopic evidence for the sympatric divergence of Globigerinoides trilobus and Orbulina universa (planktonic foraminifera). Journal of the Geological Society, London. 154: 295-302. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs


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Praeorbulina glomerosa compiled by the pforams@mikrotax project team viewed: 17-10-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104199 Go to Archive.is to create a permanent copy of this page - citation notes



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