Globorotalia pachytheca


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> truncatulinoides lineage -> Globorotalia pachytheca
Sister taxa: G. excelsa, G. pachytheca, G. cavernula, G. truncatulinoides, G. tosaensis, G. tenuitheca, G. hessi, G. ronda, G. crassaformis, G. viola, G. crassaconica, G. crassula,

Taxonomy

Citation: Globorotalia pachytheca Blow, 1969
Rank: species
Basionym: Globorotalia (Globorotalia) truncatulinoides pachytheca

Catalog entries: Globorotalia (Globorotalia) truncatulinoides pachytheca

Type images:

Distinguishing features: Like G. truncatulinoides but with more rounded chambers and less conical umbilical 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: As T. truncatulinoides but with more rounded chambers and less conical umbilical side

Aperture: : Interiomarginal umbilical-extraumbilical low arch bordered by lip [Aze 2011, based on Stewart (2003)]


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

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: >2.5┬Ám
umbilical or test sutures:Weakly depressedfinal-whorl chambers:5.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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): within PT1a subzone (0.61-1.88Ma, base in Gelasian stage). Data source: Aze 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

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

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

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Micoene climate change. In, p269 (ed.) . Earth Sciences. 1-269. gs


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Globorotalia pachytheca compiled by the pforams@mikrotax project team viewed: 28-2-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104117 Go to Archive.is to create a permanent copy of this page - citation notes



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