Globorotalia miocenica

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globorotalia -> menardii lineage -> Globorotalia miocenica
Sister taxa: G. pertenuis, G. exilis, G. limbata, G. multicamerata, G. miocenica, G. pseudomiocenica, 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:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

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]

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]

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: 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 & Srinivisan 1983, p.128

References:

Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

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

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

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


logo

Globorotalia miocenica compiled by the pforams@mikrotax project team viewed: 23-11-2017

Taxon Search:
Advanced Search

Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics