Globoconella conomiozea


Classification: pf_cenozoic -> Globorotaliidae -> Globoconella -> Globoconella conomiozea
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 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:

Distinguishing features: Like G. conoidea but more strongly vaulted umbilical side, and with 4-4¼ chambers in final whorl (vs. 4½-5).

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: 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]

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:4.0-4.5 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 ∂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]

Most likely ancestor: Globoconella conoidea - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 13, Wei 1994, fig.1.
Likely descendants: Globoconella terminalis;

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 & Srinivasan 1983, p.114

References:

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

Crundwell, M. P. (2018). Globoconella pseudospinosa, n. sp.: A new Early Pliocene planktonic foraminifera from the Southwest Pacific. Journal of Foraminiferal Research. 48(4): 288-300. gs

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

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

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

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


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Globoconella conomiozea compiled by the pforams@mikrotax project team viewed: 13-11-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104077 Go to Archive.is to create a permanent copy of this page - citation notes



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