Globorotalia multicamerata


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

Distinguishing features: Like G. limbata but with more chambers in final whorl (usually 8-10 vs 6-8), a circular-outline to the test, and a wide, circular and deep umbilicus

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]


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]

Character matrix

test outline:Circularchamber 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:8.0-10.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [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 ∂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; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.

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 & Srinivasan 1983, p.126

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

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


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Globorotalia multicamerata compiled by the pforams@mikrotax project team viewed: 17-10-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104115 Go to Archive.is to create a permanent copy of this page - citation notes



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