pforams@mikrotax - Globorotalia ronda

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:

holotype: G. crassaformis ronda
holotype: G. crassaformis ronda
paratype: G. crassaformis ronda
paratype: G. crassaformis ronda

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: Subquadrate chamber arrangement: Trochospiral edge view: Planoconvex aperture: Umbilical-extraumbilical
sp chamber shape: Subrectangular coiling axis: Low periphery: N/A aperture border: Thin lip
umb chbr shape: Subtriangular umbilicus: Narrow periph margin shape: Narrowly rounded accessory apertures: None
spiral sutures: Weakly depressed umb depth: Shallow wall texture: Smooth shell porosity: Macroperforate: >2.5µm
umbilical or test sutures: Weakly depressed final-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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: truncatulinoides lineage

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

Globorotalia ronda compiled by the pforams@mikrotax project team viewed: 16-10-2024

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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

test outline:	Subquadrate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Subrectangular	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Narrowly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Weakly depressed	final-whorl chambers:	4-4	N.B. These characters are used for advanced search. N/A - not applicable