Globoconella conoidea

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globoconella -> Globoconella conoidea
Sister taxa: G. conoidea, G. conomiozea, G. inflata, G. miozea, G. panda, G. pliozea, G. puncticulata, G. sphericomiozea, G. terminalis, G. sp.,

Taxonomy

Citation: Globoconella conoidea (Walters 1965)
Rank: species
Basionym: Globorotalia miozea conoidea Walters 1965
Synonyms:
Variants:

Catalog entries: Globorotalia (Globorotalia) iwaiensis; Globorotalia menardii miotumida;
Globorotalia miotumida explicationis;
Globorotalia miozea conoidea;

Type images:

Description


Diagnostic characters: Low trochospiral, umbilical side strongly conical, distinct keel

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


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

Test morphology: 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]

Biogeography and Palaeobiology


Geographic distribution: Temperate to warm subtropical. [Kennett & Srinivasan 1983]

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.) 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]

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 & Srinivisan 1983, p.112

References:

Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

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

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.

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

Wei, K., (1994). 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.


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Globoconella conoidea compiled by the pforams@mikrotax project team viewed: 18-8-2017

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AphiaID: 1026408 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



AphiaID: 1026408 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes

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