pforams@mikrotax - Globorotalia excelsa

Globorotalia excelsa


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> truncatulinoides lineage -> Globorotalia truncatulinoides -> Globorotalia excelsa
Sister taxa: G. excelsa

Taxonomy

Citation: Globorotalia excelsa Sprovieri & Ruggieri in Sprovieri et al. 1980
Rank: Species
Basionym: Globorotalia truncatulinoides excelsa Sprovieri & Ruggieri in Sprovieri et al. 1980
Taxonomic discussion: Arguably an intraspecifc variant of  a variant of  G. truncatulinoides. Considered a separate species by Aze et al. (2011) but not by Kennett & Srinivasan (1983) or Brummer & Kucera (2022)

Catalog entries: Globorotalia truncatulinoides excelsa

Type images:

Distinguishing features:
Parent taxon (Globorotalia truncatulinoides): Like G. tosaensis but with a pronounced keel and a more open umbilicus
This taxon: Like G. truncatulinoides but with a more acute peripheral keel, a more open umbilicus and fewer pustules covering the surface

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


Emended description:


Morphology:

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

Size:

Character matrix
test outline:Subpolygonalchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Low to middle latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

Isotope paleobiology: Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on comparison with other species of the genus

Most likely ancestor: Globorotalia tosaensis - at confidence level 2 (out of 5). Data source: Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Not recognised by WG138 but recorded as extant by Aze et al. 2011
First occurrence (base): in upper part of PT1a subzone (69% up, 1Ma, in Calabrian 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:

References:

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

Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs V O

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

Rio, D., Sprovieri, R., di Stefano, E. & Raffi, I. (1984). Globorotalia truncatulinoides (d’Orbigny) in the Mediterranean upper Pliocene geologic record. Micropaleontology. 30(2): 127-137. gs

Sprovieri, A., Ruggieri, G. & Unti, M. (1980). Globorotalia truncatulinoides excelsa n. subsp., foraminifero planctonico guida per il Pleistocene inferiore. Bollettino della Societa Geologica Italiana. 99(1-2): 3-11. gs

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


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Globorotalia excelsa compiled by the pforams@mikrotax project team viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104099 Go to Archive.is to create a permanent copy of this page - citation notes



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