K_S 1983 31-6.JPG
K_S 1983 31-6.JPG
NB Globorotalia margaritae primitiva Cita was also considered a synonym by Kennett & Srinivasan 1983 but was regarded as a distinct sub-species by Stewart (2003) and Aze et al. (2011).
Catalog entries: Globorotalia juanai, Globorotalia martinezi, Globorotalia andalusiana, Globorotalia praemargaritae
Type images:
holotype: G. juanai_USNM221846_holo.jpg)
holotype: G. juanai_USNM221847_para.jpg)
paratype: G. juanai_USNM221848_para.jpg)
paratype: G. juanai_USNM221849A_para.jpg)
paratype: G. juanai
paratypes: G. juanai
paratypes: G. juanaiDistinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Like G. scitula but periphery rounded and early chambers umbonate
Aperture: Interiomarginal umbilical-extraumbilical low arch or slit bordered by a thin lip [Aze 2011, based on Kennett & Srinivasan 1983]
Diagnostic characters:
Morphology:
Wall type:
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Inequally biconvex | aperture: | Umbilical-extraumbilical |
| sp chamber shape: | Crescentic | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Subtriangular | umbilicus: | Narrow | periph margin shape: | Moderately 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: | 4-4.5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
[SCOR WG138]
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Most likely ancestor: Globorotalia scitula - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan (1983) NB Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5 suggest juanai and praemargaritae are separate species and that juanai is closer to challengeri;.
Likely descendants: Globorotalia margaritae;
plot with descendants
Geological Range:
Last occurrence (top): within N18 zone (5.20-5.72Ma, top in Zanclean stage). Data source: Chaisson & Pearson (1997)
First occurrence (base): near base of M13a subzone (13% up, 9.7Ma, in Tortonian 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:
Primary source for this page: Kennett & Srinivasan 1983, p.134
Aze, T., et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs Bermudez, P. J. & Bolli, H. M. (1969). Consideraciones sobre los sedimentos del mioceno medio al reciente de las costas central y oriental de Venezuela. Tercera Parte. Los foraminiferos planctonicos. Boletin de Geologia. 10(20): 137-223. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Perconig, E. (1968). Nuove specie di foraminiferi planctonici della Sezione di Carmona (Andalusia, Spagna). Committee Mediterranean Neogene Stratigraphy. 35(3): 219-232. gs Perconig, E., Martinez, C. & Granado, L. (1980). Globorotalia andalusiana, nueva especie de foraminfero del Mioceno terminal (Andaluciense). Rev. Espanola Micropal., Madrid, Spain, 1980, vol. 12, no. I, pp. 27-31. Revista Española de Micropaleontología. 12(1): 27-31. gs Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs OReferences:
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Globorotalia juanai compiled by the pforams@mikrotax project team viewed: 7-11-2025
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