Globoconella miozea


Classification: pf_cenozoic -> Globorotaliidae -> Globoconella -> Globoconella miozea
Sister taxa: G. inflata, G. puncticulata, G. sphericomiozea, G. terminalis, G. pliozea, G. conomiozea, G. conoidea, G. miozea, G. panda, G. sp.,

Taxonomy

Citation: Globoconella miozea (Finlay 1939)
Rank: species
Basionym: Globorotalia miozea
Synonyms:

Catalog entries: Globorotalia miozea

Type images:

Distinguishing features: Like G. praescitula but larger, more inflated test, 5 of chambers in final whorl (vs 4½), and more strongly developed secondary thickening and rugosity of the umbilical side

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: Trochospiral, biconvex, equatorial periphery lobulate with keel

Aperture: Interiomarginal umbilical-extraumbilical low arch with a thickened rim [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test low trochospiral, biconvex, equatorial periphery lobulate, periphery sharp angled to rounded, five chambers in the final whorl, increasing slowly in size; sutures on spiral side strongly curved, on umbilical side, slightly curved to radial , depressed; surface densely perforate; last two chambers smooth, rest of the test covered with tiny pustules and secondary calcite crust obscuring the pores (PI. 24, Fig. 2); aperture interiomarginal, umbilical-extraumbilical, a low narrow arch with a thickened rim. [Kennett & Srinivasan 1983]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:5.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Temperate to warm subtropical. [Kennett & Srinivasan 1983] Low to middle 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 light ∂13C and relatively heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Schneider & Kennett (1996)

Phylogenetic relations: Gr. (G.) miozea is distinguished from its ancestral form Gr. (G.) praescitula by its larger, more inflated test, an increase in the number of chambers in the final whorl from about four and one-half in Gr. (G.) praescitula, and more strongly developed secondary thickening and rugosity of the umbilical side. Both Walters (1965) and Jenkins (1971) regarded Gr. (G.) praescitula as the ancestor of Gr. (G.) miozea. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia praescitula - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 13.
Likely descendants: Globoconella conoidea;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N15 zone (9.83-10.46Ma, top in Tortonian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N7 zone (16.38-17.54Ma, base in Burdigalian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.112

References:

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

Finlay, H. J. (1939c). New Zealand foraminifera: Key species in stratigraphy - no. 3. Transactions of the Royal Society of New Zealand. 69(3): 309-329. gs

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

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Schneider, C. E. & Kennett, J. P. (1996). Isotopic evidence for interspecies habitat differences during evolution of the Neogene planktonic foraminiferal clade Globoconella. Paleobiology. 22: 282-303. gs


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Globoconella miozea compiled by the pforams@mikrotax project team viewed: 16-9-2019

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