Globorotalia cibaoensis


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia cibaoensis
Sister taxa: G. hirsuta, G. theyeri, G. margaritae, G. juanai, G. bermudezi, G. scitula, G. praescitula, G. cibaoensis, G. gigantea, G. challengeri,

Taxonomy

Citation: Globorotalia cibaoensis Bermudez 1949
Rank: species
Basionym: Globorotalia cibaoensis
Synonyms:

Catalog entries: Globorotalia cibaoensis

Type images:

Distinguishing features: Distinguished by its biconvex test with a rounded periphery (sometimes angular or narrowly keeled in the final chamber.)

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: Low trochospiral, biconvex, equatorial periphery subquadrate

Aperture: Interiomarginal umbilical-extraumbilical low arch bordered by a thin lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Non-spinose; Smooth [Aze 2011]

Test morphology: Test low trochospiral, biconvex, equatorial periphery subquadrate, axial periphery ovate, subrounded to subacute; 4 to 4½ inflated chambers in the final whorl, increasing rapidly in size as added; spiral sutures oblique, depressed , on umbilical side radial, depressed; surface finely perforate, on early chambers pustulose on umbilical as well as spiral ,side; umbilicus narrow; aperture a low arch bordered by a thin lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-4.5 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 4 - Open ocean sub-thermocline. Based on comparison with other species of the genus

Phylogenetic relations: Gr. (H) cibaoensis is distinguished by its biconvex test with a rounded periphery, which sometimes becomes angular or narrowly keeled in the final chamber.
Gr. (H) cibaoensis descended from G. (H.) scitula in the Late Miocene and is a close relative of the Gr. ( H ) juanai-margaritae plexus. We believe it is the ancestor of Globorotalia crassula Cushman and Stewart, which evolved in temperate-Subantarctic areas during the latest Miocene and thence gave rise to the Gr. (T.) crassaformis to Gr. (T.) truncatulinoides lineage. We have observed gradation between Gr.(H) cibaoensis and Gr. (T.) crassula in DSDP Site 281 (Subantarctic area). [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia scitula - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 15; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia crassula;

Biostratigraphic distribution

Geological Range:
Notes: The first appearance of Gr. (H.) cibaoensis provides a valuable biostratigraphic datum for correlation of Late Miocene-Pacific DSDP sequences close to the ∂C13 shift at 6.2 Ma.
Last occurrence (top): in upper part of PL1 [Atl.] zone (81% up, 4.6Ma, in Zanclean 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).
First occurrence (base): in lower part of M13a subzone (35% up, 9.4Ma, 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.136

References:

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

Bermudez, P. J. (1949). Tertiary smaller foraminifera of the Dominican Republic. Cushman Laboratory for Foraminiferal Research, Special Publication. 25: 1-322. gs

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

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

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


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Globorotalia cibaoensis compiled by the pforams@mikrotax project team viewed: 15-11-2019

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