pforams@mikrotax - Globoconella miotumida pforams@mikrotax - Globoconella miotumida

Globoconella miotumida

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


Citation: Globoconella miotumida (Walters 1965)
taxonomic rank: Species
Taxonomic discussion: Kennett & Srinivasan (1983) used the name G. conoidea but noted that:  "Globorotalia miotumida (Jenkins 1960) may represent a thin-walled form of Gr. (G.) conoidea Walters. If so, it should have priority." Cifelli and Scott (1986), Scott et al. (1990) and Lam & Leckie (2020) all conclude that they were indeed synonyms, and so used the name miotumida.

Catalog entries: Globorotalia menardii miotumida, Globorotalia miozea conoidea, Globorotalia miotumida explicationis, Globorotalia (Globorotalia) iwaiensis, Globorotalia (Globoconella) conomiozea subconomiozea

Type images:

Distinguishing features:
Parent taxon (Globoconella): Globorotaliids having a high-arched aperture
This taxon: Like G. miozea but much larger size, with more conical umbilical side, and tendency to develop a distinct keel

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.


Test relatively large, a relatively low trochospire consisting of 2½ to 3 whorls of slowly enlarging chambers, 4½ to 5 chambers in the final whorl; spiral side slightly convex, umbilical side highly conical; periphery bluntly rounded and thickened on early chambers, but on later chambers more sharply angled, with a narrow, cord like keel; sutures on spiral side strongly recurved, slightly raised, on umbilical side depressed, radial to slightly curved: Surface finely perforate, but earlier chambers show a progressive secondary thick- ening, especially on the periphery and on the umbilical surface. Umbilicus small, open; aperture interiomarginal, umbilical-extraumbilical, a low, distinct arch bordered by an indistinct rim. [Kennett & Srinivasan 1983]

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

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thin 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:4.5-5 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 δ13C and relatively heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Schneider & Kennett (1996)

Phylogenetic relations
Gr. (G.) conoidea differs from Gr. (G.) miozea by its much larger size, by its much more conical umbilical side, and by its tendency to develop a distinct keel. [Kennett & Srinivasan 1983]

Most likely ancestor: Globoconella miozea - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 13; Aze et al. 2011 fig. 5 (both as G. conoidea).
Likely descendants: Globoconella conomiozea; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within M13b subzone (6.14-8.58Ma, top in Messinian stage). Data source: Wei 1994 (age from fig.1 converted to modern zone)
First occurrence (base): within N9 zone (14.24-15.10Ma, base in Langhian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

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


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

Cifelli, R. & Scott, G. H. (1986). Stratigraphic record of the Neogene globorotaliid radiation (Planktonic Foraminiferida). Smithsonian Contributions to Paleobiology. 58: 101-. gs

Hayashi, H., Kurihara, Y., Horiuchi, S., Iwashita, T. & Yanagisawa, Y. (2003). Planktonic foraminifera biostratigraphy of the Miocene sequence in the Iwadono Hills, Central Japan: An Integrated approach. Palaios. 18: 176-191. gs

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

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. 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

Scott, G. H., Bishop, S. & Burt, B. J. (1990). Guide to some Neogene Globorotalids (Foraminiferida) from New Zealand. New Zealand Geological Survey, Paleontological Bulletin. 61: 1-135. gs

Walters, R. (1965). The Globorotalia zealandica and G. miozea lineages. New Zealand Journal of Geology and Geophysics. 8: 109-127. gs

Wei, K. -Y. (1994b). Stratophenetic tracing of phylogeny using SIMCA pattern recognition technique: a case study of the late Neogene planktic foraminifera Globoconella clade. Paleobiology. 20(1): 52-65. gs


Globoconella miotumida compiled by the pforams@mikrotax project team viewed: 21-4-2024

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Comments (2)


Hi there! Why the figure of Lam and Leckie 2020 with G. conomiozea (with angle less than 90 degree is here in the G. miotumida page?

Jeremy Young

Oops, you are quite right that image had ended up on the rong page. I have moved it now.

thank you Jeremy