Globorotalia multicamerata

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

Taxonomy

Citation: Globorotalia multicamerata Cushman & Jarvis 1930
Rank: species
Basionym: Globorotalia menardii var. multicamerata Cushman & Jarvis 1930
Synonyms:

Catalog entries: Globorotalia menardii multicamerata;

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, 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]


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

Test morphology: Test a large, low trochospiral, com- pressed, equatorial periphery weakly lobulate; axial periphery acute with a prominent cordlike keel; 8 to 10 chambers of the final whorl, increasing very slowly in size; sutures on spiral side limbate, curving backward to merge into peripheral keel, on umbilical side almost radial and depressed; surface uniformly and densely perforate, pustulose near umbilicus; umbilicus a distinct circular pit; aperture interiomarginal, extraumbilical-umbilical, a low slit bordered by a distinct lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂13C and relatively heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): D. R. M. Stewart unpublished data

Phylogenetic relations: Gr. (M.) multicamerata is closely related to Gr. (M.) limbata from which it differs by an increase in the number of final chambers (usually eight to ten), circular-outline of the test, and by its wide, circular and deep umbilicus. A continuous morphological intergradation exists between typical Gr. (M.) limbata and Gr. (M.) multicamerata, and the distinction between these species is somewhat difficult to recognize, especially in Late Miocene Zone N17B. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia limbata - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 14.

Biostratigraphic distribution

Geological Range:
Notes: The evolution of Gr. (M.) multicamerata from Gr. (M.) limbata is a useful biostratigraphic datum within Zone N17 , close to the first evolutionary appearance of Pulleniatina primalis. [Kennett & Srinivasan 1983]
Last occurrence (top): in lower part of PL5 [Atl.] zone (19% up, 3Ma, in Gelasian 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): within N17b zone (5.72-6.60Ma, base in Messinian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.126

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.

Cushman, J.A. & Jarvis, P.W., (1930). Miocene foraminifera from Buff Bay, Jamaica. Journal of Paleontology, 4(4): 353-368.

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


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Globorotalia multicamerata compiled by the pforams@mikrotax project team viewed: 16-12-2017

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