pforams@mikrotax - Globorotalia praemenardii pforams@mikrotax - Globorotalia praemenardii

Globorotalia praemenardii


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

Taxonomy

Citation: Globorotalia praemenardii Cushman & Stainforth 1945
Taxonomic rank: species
Basionym: Globorotalia praemenardii Cushman & Stainforth 1945
Synonyms: Globorotalia (Menardella) praemenardii (Cushman & Stainforth 1945) [e.g. Kennett & Srinivasan 1983]

Catalog entries: Globorotalia praemenardii

Type images:

Distinguishing features:
Parent taxon (menardii lineage): G. archeomenardii - menardii, limbata - miocenica & exilis - pertenius lineages
This taxon: Like G. archeomenardii but larger, more lobulate, and with less convex spiral side.

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, periphery moderately lobulate, axial periphery acute with a narrow but distinct keel; chambers compressed, 5 to 6 chambers in the final whorl, increasing rapidly in size; sutures on spiral side strongly curved, flush on the early chambers, slightly raised on the later; on umbilical side slightly curved to radial, depressed; surface smooth, finely perforate; umbilicus narrow, shallow; aperture interiomarginal, extraumbilical-umbilical with a low slit, bordered by a lip. [Kennett & Srinivasan 1983]

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

Character matrix
test outline:Lobatechamber 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:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution
Tropical to warm sub-tropical, rare in waters transitional between the warm subtropics and temperate areas. [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.) praemenardii gave rise to Gr. (M.) menardii, from which it differs by its smaller size and its less-distinct peripheral keel. [Kennett & Srinivasan 1983]

Most likely ancestor:
Globorotalia archeomenardii - 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 menardii; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N12 zone (11.79-13.41Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): in upper part of M6 zone (82% up, 14.4Ma, 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).

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

Cushman, J. A. & Stainforth, R. M. (1945). The foraminifera of the Cipero Marl Formation of Trinidad, British West Indies. Cushman Laboratory for Foraminiferal Research, Special Publication. 14: 1-75. gs

Fox, L. R. & Wade, B. S. (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research. 43: 374-405. gs

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

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. 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

logo

Globorotalia praemenardii compiled by the pforams@mikrotax project team viewed: 5-3-2026

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=104125 Go to Archive.is to create a permanent copy of this page - citation notes
Powered by Mikrotax taxonomy content management system developed by Jeremy Young


Add Comment

* Required information
Captcha Image

Comments

No comments yet. Be the first!