Globorotalia miocenica


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> menardii lineage -> Globorotalia miocenica
Sister taxa: G. pertenuis, G. exilis, G. multicamerata, G. miocenica, G. pseudomiocenica, G. limbata, G. menardii, G. praemenardii, G. archeomenardii,

Taxonomy

Citation: Globorotalia miocenica Palmer 1945
Rank: species
Basionym: Globorotalia menardii var. miocenica Palmer 1945
Synonyms:

Catalog entries: Globorotalia menardii miocenica

Type images:

Distinguishing features: Distinguished from other species of the menardii lineage by its distinctly planoconvex test and circular outline.

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: Lenticular, planoconvex, low trochospiral, prominent keel and densely perforate surface

Aperture: Interiomarginal umbilical-extraumbilical low-arched slit with thin lip [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test very low trochospiral, spiral side flat, umbilical side strongly convex, equa- torial periphery almost circular, axial periphery planoconvex with a pronounced keel; 6 to 7 chambers in the final whorl; spiral sutures curved, limbate, merging into keel, on umbilical side sinuous to radial, depressed; surface smooth, densely perforate; umbilicus small, fairly deep; aperture interiomarginal, extraumbilical-umbilical, a fairly low-arched slit with a thin lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raisedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Endemic to the tropical Atlantic; rare in the eastern equatorial Pacific as a result of migration through the Gulf of Panama (Stainforth et aI., 1975). [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on comparison with other species of the genus

Phylogenetic relations: Gr. (Menardella) miocenica is distinguished from other species of Menardella by its distinctly planoconvex test and circular outline. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia pseudomiocenica - at confidence level 4 (out of 5). Data source: Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5 (but differs from Kennett & Srinivasan 1983, fig. 14).

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of PL5 [Atl.] zone (100% up, 2.4Ma, in Gelasian stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): near base of PL3 [Atl.] zone (12% up, 3.8Ma, 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).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.128

References:

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

Palmer, D. K. (1945). Notes on the Foraminifera from Bowden, Jamaica. Bulletin of American Paleontology. 29(115): 1-82. gs

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


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Globorotalia miocenica compiled by the pforams@mikrotax project team viewed: 14-11-2019

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