pforams@mikrotax - Globorotalia bella pforams@mikrotax - Globorotalia bella

Globorotalia bella


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> temperate Globorotalia species -> Globorotalia bella
Sister taxa: G. bella, G. zealandica

Taxonomy

Citation: Globorotalia bella (Jenkins, 1967)
Taxonomic rank: species
Basionym: Globorotalia bella
Synonyms:
Taxonomic discussion: Leckie at al (2018) do not include G. bella in Paragloborotalia since: "Globorotalia bella Jenkins was described from the lower Miocene of New Zealand, and has previously been placed in Paragloborotalia by several workers (e.g., Scott, 1992; Morgans and others, 2002; Li and others, 2003; Kender and others, 2008; Aze and others, 2011). However, our new SEMs of the holotype do not indicate a cancellate, sacculifer-type wall, but a smooth wall that is more like Globoconella than Paragloborotalia, therefore bella is not considered further in this work."
NB The unpublished images mentioned in Leckie et al. (2018) are given here. The species appears to be very different to any of the species included in Globoconella, so it is included here in Globorotalia but outside the well-established lineage groups. [editor's comment - JRY 2018]

Catalog entries: Globorotalia bella

Type images:

Distinguishing features:
Parent taxon (temperate Globorotalia species): temperate species which do not readily fit in the main lineages
This taxon: Low trochospiral, equatorial periphery quinquelobate, chambers ovate; aperture with thick lip

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:
Low trochospiral, equatorial periphery quinquelobate, chambers ovate. Aperture interiomarginal umbilical-extraumbilical low arch with a thick lip [Aze 2011, based on Kennett & Srinivasan 1983]

Morphology:
Test low trochospiral, equatorial periphery quinquelobate, axial periphery rounded , chamber ovate, inflated , 5 in the final whorl increasing uniformly in size as added, sutures on both umbilical and spiral side nearly radial, depressed; surface coarsely and uniformly perforate; smooth with circular pores; umbilicus small, narrow; aperture a rather low arch with a thick lip, interio-marginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

Wall type:
Spinose; Coarsely cancellate [Aze 2011]

Size:
Warm to cool subtropicaL [Kennett & Srinivasan 1983]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:5-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution
Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology
Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on comparison with other species of the genus

Phylogenetic relations
Gr. (J.) bella is distinguished from Gr. (J.) semivera by its lower arched aperture and from Gr. (J.) siakensis by its lower arched aperture and axially compressed final chamber in peripheral view. Morphological similarity between Gr. (J.) bella and Gr. (J.) mayeri, especially with regard to the axially depressed final chamber in peripheral view, suggests a close phlyogenetic relationship. However, Gr. (J.) bella differs from Gr. (J.) mayeri in lacking distinctly curved sutures. It is probable that Gr. (J) bella is an intermediate morphotype between Gr. (J.) siakensis and Gr. (J.)mayeri. It resembles Gr. (J.) siakensis in having almost radial sutures and resembles Gr. (J.) mayeri in having an axially depressed final chamber in peripheral view. [Kennett & Srinivasan 1983]

Most likely ancestor:
Paragloborotalia mayeri - at confidence level 1 (out of 5). Data source: Kennett & Srinivasan (1983).

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N8 zone (15.10-16.38Ma, top in Langhian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N5 zone (17.59-21.12Ma, base in Aquitanian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.174

References:

Aze, T., et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Jenkins, D. G. (1967). Planktonic foraminiferal zones and new taxa from the lower Miocene to the Pleistocene of New Zealand. New Zealand Journal of Geology and Geophysics. 10(4): 1064-1078. gs

Kender, S., Kaminski, M. & Jones, R. (2008). Early to middle Miocene foraminifera from the deep-sea Congo Fan, offshore Angola. Micropaleontology. 54(477-568): -. gs

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

Leckie, R. M., et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. gs

Li, Q., McGowran, B. & Brunner, C. A. (2003a). Neogene planktonic foraminiferal biostratigraphy of Sites 1126, 1128, 1130, 1132, and 1134, ODP Leg 182, Great Australian Bight. Proceedings of the Ocean Drilling Program, Scientific Results. 182: 1-67. gs

Morgans, H. E. G., et al. (2002). Integrated stratigraphy of the lower Altonian (early Miocene) sequence at Tangakaka Stream, East Cape, New Zealand. New Zealand Journal of Geology and Geophysics. 45: 145-173. gs

Scott, G. H. (1992). Planktonic foraminiferal biostratigraphy (Altonian-Tongaporutuan States, Miocene) at DSDP Site 593, Challenger Plateau, Tasman Sea. New Zealand Journal of Geology and Geophysics. 35: 501-513. gs

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Globorotalia bella compiled by the pforams@mikrotax project team viewed: 18-6-2026

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