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
Wall type:
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 |
[SCOR WG138]
Geographic distribution
Isotope paleobiology
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
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:
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 OReferences:
Globorotalia ronda compiled by the pforams@mikrotax project team viewed: 6-11-2024
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