Globoconella conomiozea

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globoconella -> Globoconella conomiozea
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 conomiozea (Kennett 1966)
Rank: species
Basionym: Globorotalia conomiozea Kennett 1966
Synonyms:
Variants:

"Globorotalia mediterranea Catalano and Sprovieri appears to be a closely related species." [Kennett & Srinivasan 1983]

Catalog entries: Globorotalia conomiozea; Globorotalia miocenica mediterranea;

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: Planoconvex, umbilical side strongly vaulted with acute strong keel

Aperture: : Interiomarginal extraumbilical high arch, bordered by lip [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test planoconvex, spiral side flat to slightly convex , umbilical side strongly vaulted ; periphery subovate, fairly weakly lobulate, margin acute with strong keel; surface finely perforate, typically with pustules developed strongly on the umbilical side of early chambers; four to four and one-half chambers in the final whorl, inflated on the umbilical side; sutures on spiral side thick- ened, strongly curved; on umbilical side radial to slightly curved, depressed ; umbilicus small, deep, aperture high arched, bordered by a lip, interiomarginal, extraumbilical. [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.) conomiozea is distinguished from Gr. (G.) conoidea by its more strongly vaulted umbilical side and by having 4 to 4¼ chambers in the final whorl.
Gr. (G.) conomiozea is a short-ranging species of an evolving lineage and hence is a valuable index fossil. A detailed biometric study of its evolution has been carried out by Malmgren and Kennett (1981). [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within M14 [Atl.] zone (5.72-6.14Ma, top in Messinian stage). Data source: Wei 1994 (quoted age converted to modern zone)
First occurrence (base): within M13b subzone (6.14-8.58Ma, base in Tortonian stage). Data source: Wei 1994 (quoted age converted to modern zone)

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.114

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.

Kennett, J.P., (1966). The Globorotalia crassaformis bioseries in north Westland and Marlborough, New Zealand,. Micropaleontology, 12: 235-245.

Malmgren, B.A. & Kennett, J.P., (1981). Phyletic gradualism in a Late Cenozoic planktonic foraminiferal lineage; DSDP site 284, southwest Pacific. Paleobiol., 7(2): 230-240.

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.

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 conomiozea compiled by the pforams@mikrotax project team viewed: 19-10-2017

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