Globigerinoides conglobatus


Classification: pf_cenozoic -> Globigerinidae -> Globigerinoides -> Globigerinoides conglobatus
Sister taxa: G. elongatus, G. extremus, G. conglobatus, G. eoconglobatus, G. obliquus, G. altiaperturus, G. joli, G. neoparawoodi, G. kennetti, G. bollii, G. italicus, G. ruber, G. mitra, G. seigliei, G. subquadratus, G. diminutus, G. bulloideus, G. sp.,

Taxonomy

Citation: Globigerinoides conglobatus (Brady, 1879)
Rank: species
Basionym: Globigerina conglobata Brady, 1879
Synonyms:

Catalog entries: Globigerina conglobata, Globigerinoides canimarensis, Globigerina gomitulus

Type images:

Distinguishing features: Tightly coiled test with flattened chambers and very small umbilicus

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: Tightly coiled trochospiral, subglobular to subquadrate
Aperture: Primary aperture interiomarginal umbilical, long low asymmetric arch with thin rim. Supplementary sutural apertures on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]
Coiling direction (in extant population): mixed.

Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test large, tightly coiled, trochospiral, subglobular to subquadrate, three to three and a half chambers in the final whorl increasing very slowly in size as added; sutures distinctly depressed, almost radial; surface coarsely perforated with spines and spine bases; umbilicus narrow; primary aperture interiomarginal, umbilical , a long, low asymmetric arch bordered by a thin rim; sutural supplementary apertures, small, irregular on the spiral side. [Kennett & Srinivasan 1983]

Size: >250µm

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Sutural
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.0-3.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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

In modern oceans a common, warm water, species [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 Cited sources (Aze et al. 2011 appendix S3): Keller (1985)

Phylogenetic relations: Gs. conglobatus is distinguished by its thick-walled and tightly coiled test. Specimens representing an evolutionary and morphologic transition between Gs. extremus and Gs. conglobatus resemble Gs. conglobatus canimarensis Bermudez. We concur with Parker (1973) and Stainforth et al. (1975) in treating Gs. canimarensis as a synonym of Gs. conglobatus. Following Mistretta (1962), Globigerinoides gomitulus (Seguenza, 1880) with a smaller and more compact test than Gs. conglobatus is considered a junior synonym of Gs. conglobatus. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from 25 sequences. References: Darling et al. 1997; Ujiié & Lipps 2009;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): in upper part of M13b subzone (84% up, 6.5Ma, in Tortonian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.58

References:

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

Brady, H. B. (1879). Notes on some of the reticularian Rhizopoda of the "Challenger" expedition. I.- On new or little known arenaceous types. Quarterly Journal of Microscopical Science. 19: 20-63. gs

Darling, K. F., Wade, C. M., Kroon, D. & Brown, A. J. L. (1997). Planktic foraminiferal molecular evolution and their polyphyletic origins from benthic taxa. Marine Micropaleontology. 30: 251-266. gs

Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir. 163: 1-337. gs

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

Loeblich, A. & Tappan, H. (1994). Foraminifera of the Sahul shelf and Timor Sea. Cushman Foundation for Foraminiferal Research, Special Publication. 31: 1-661. gs

Mistretta, E. (1962). Foraminiferi planctonici del Pliocene inferiore di Altavilla Milicia (Palermo, Sicilia),. RIvista Italiana di Paleontologia e Stratigrafia. 68(1): 97-114. gs

Parker, F. L. (1973). Late Cenozoic biostratigraphy (Planktonic foraminfera) of Tropical Atlantic deep-sea sections. Revista Espanola de Micropaleontología. 5(2): 253-289. gs

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

Seguenza, G. (1880). Le foramazioni terziarie nella provincia di Reggio (Calabria),. p1-446. Rendiconti. Accademia Nazionale dei Lincei, Classe(6): -. gs

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions. 62: 1-425. gs

Ujiié, Y. & Lipps, J. H. (2009). Cryptic diversity in planktonic foraminifera in the northwest Pacific ocean. Journal of Foraminiferal Research. 39: 145-154. gs


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Globigerinoides conglobatus compiled by the pforams@mikrotax project team viewed: 22-10-2019

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