pforams@mikrotax - Globorotalia ronda pforams@mikrotax - Globorotalia ronda

Globorotalia ronda


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

Taxonomy

Citation: Globorotalia ronda Blow, 1969
taxonomic rank: species
Basionym: Globorotalia crassaformis ronda Blow, 1969

Catalog entries: Globorotalia crassaformis ronda

Type images:

Distinguishing features:
Parent taxon (truncatulinoides lineage): G. crasula - crassaformis - tosaensis - truncatulinoides lineage, predominantly conicotruncate
This taxon: Like G. crassaformis but more rounded peripheral margin and relatively thickened test

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


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

Character matrix
test outline:Subquadratechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Subrectangularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Narrowly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4-4 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)]

[SCOR WG138]


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 crassaformis - at confidence level 2 (out of 5). Data source: Kennett & Srinivasan 1983 ; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5 (NB Aze et al 2011 derived G. ronda from G. oceanica but G. oceanica is treated here as a variant of G. crassaformis).
Likely descendants: Globorotalia hessi; Globorotalia tenuitheca; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of PT1a subzone (100% up, 0.6Ma, in Ionian stage). Data source: Aze et al. 2011
First occurrence (base): within PL2 zone (3.85-4.37Ma, base in Zanclean 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 Miocene climate change. PhD thesis, Bristol University. 1-269. gs O


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Globorotalia ronda compiled by the pforams@mikrotax project team viewed: 15-4-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104130 Go to Archive.is to create a permanent copy of this page - citation notes



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