pforams@mikrotax - Praeorbulina glomerosa

pforams@mikrotax - Praeorbulina glomerosa pforams@mikrotax - Praeorbulina glomerosa

Praeorbulina glomerosa

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

K_S 1983 18-5.JPG
Miller & Katz 1987 pl12 fig4.jpg
Norris98 pl2-21.JPG
Postuma 1971 p377-4.JPG
Postuma 1971 p377-7.JPG

Taxonomy

Citation: Praeorbulina glomerosa (Blow 1956)

Taxonomic rank: species

Basionym: Globigerinoides glomerosa glomerosa Blow 1956

Catalog entries: Globigerinoides glomerosa glomerosa

Type images:

holotype: G. glomerosa glomerosa
holotype: G. glomerosa glomerosa
holotype: G. glomerosa glomerosa
x: G. glomerosa glomerosa
x: G. glomerosa glomerosa

Distinguishing features:
Parent taxon (Praeorbulina): Terminal chamber partially enveloping previous chambers
This taxon: 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]

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]

Wall type:

Spinose; Cancellate [Aze 2011]

Character matrix
test outline: Circular chamber arrangement: Trochospiral edge view: Equally biconvex aperture: Umbilical
sp chamber shape: Inflated coiling axis: Moderate periphery: N/A aperture border: N/A
umb chbr shape: Inflated umbilicus: Wide periph margin shape: Broadly rounded accessory apertures: Sutural
spiral sutures: Weakly depressed umb depth: Deep wall texture: Cancellate shell porosity: Macroperforate: >2.5µm
umbilical or test sutures: Moderately depressed final-whorl chambers: 1-3 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 δ¹³C and relatively light δ¹⁸O. 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; plot with descendants

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:

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.
Grey shading between taxa indicates intergrading species within an anagenetic lineage (data from Lamyman et al. 2026).
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Praeorbulina glomerosa, synonyms included - Praeorbulina circularis; Praeorbulina curva; Praeorbulina glomerosa; Praeorbulina glomerosa circularis; Praeorbulina glomerosa circularis (q); Praeorbulina glomerosa curva; Praeorbulina glomerosa glomerosa;
See also space-time plot :: Samples map :: Parent: Praeorbulina

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 O

Miller, K. G. & Katz, M. E. (1987). Micropaleontology. 33(2): 97-149. gs

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

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 of London. 154: 295-302. gs

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

Praeorbulina glomerosa compiled by the pforams@mikrotax project team viewed: 10-10-2026

Taxon Search:

Advanced Search

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

Add Comment

Comments

No comments yet. Be the first!

test outline:	Circular	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Inflated	coiling axis:	Moderate	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	1-3	N.B. These characters are used for advanced search. N/A - not applicable