pforams@mikrotax - Globorotalia archeomenardii pforams@mikrotax - Globorotalia archeomenardii

Globorotalia archeomenardii


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

Taxonomy

Citation: Globorotalia archeomenardii Bolli, 1957
Taxonomic rank: species
Basionym: Globorotalia archeomenardii Bolli, 1957
Synonyms:

Catalog entries: Globorotalia archeomenardii

Type images:

Distinguishing features:
Parent taxon (menardii lineage): G. archeomenardii - menardii, limbata - miocenica & exilis - pertenius lineages
This taxon: Lenticular, low trochospiral, prominent keel and densely perforate surface; aperture low-arched slit, with a distinct lip

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, low trochospiral, prominent keel and densely perforate surface

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


Morphology:
Test low trochospiral, compressed, equatorial periphery slightly lobate, axial periphery acute, with thin, keel-like structure, 5 to 5½ chambers in the final whorl, increasing uniformly in size, sutures on spiral side strongly curved; on umbilical side radial to slightly curved, depressed; surface smooth, very finely perforate; umbilicus small, shallow; aperture low-arched slit, with a distinct lip; interiomarginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

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

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thick 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:5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution
Tropical to warm sub-tropical. [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 light δ13C and relatively heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson & Shackleton (1995); D. R. M. Stewart unpublished data

Phylogenetic relations
Gr. (M.) archeomenardii is distinguished from Gr. (M.) praemenardii in being smaller, less lobulate, and in having a more convex spiral side.
Gr. (M.) archeomenardii is the earliest member of the Menardella lineage, which evolved from Gr. (G.) praescitula in tropical waters during the latest Early Miocene. Bolli (1957) was the first to suggest that Gr. (M.) archeomenardii was ancestral to the Gr. (M.) praemenardii-Gr. (M.) menardii lineage. [Kennett & Srinivasan 1983]

Most likely ancestor:
Globorotalia praescitula - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 14;Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia praemenardii; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in upper part of M7 zone (80% up, 13.9Ma, in Langhian 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): 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.122

References:

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

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. 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 O

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 144: 401-410. gs

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

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Miocene climate change. PhD thesis, Bristol University. 1-269. gs O

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Globorotalia archeomenardii compiled by the pforams@mikrotax project team viewed: 22-1-2026

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