Globigerinella siphonifera

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerinella -> Globigerinella siphonifera
Sister taxa: G. adamsi, G. calida, G. praesiphonifera, G. pseudobesa, G. radians, G. siphonifera,

Taxonomy

Citation: Globigerinella siphonifera (d'Orbigny, 1839)
Rank: species
Basionym: Globigerina siphonifera d'Orbigny, 1839
Synonyms: Globigerina aequilateralis Brady 1879 = Globigerinella aequilateralis (Brady 1879) = Hastigerina aequilateralis (Brady 1879) [accoridng to SCOR-WG138]
Variants:
Taxonomic discussion:
There has been variable use of the names G. aequilateralis and G. siphonifera. For example Kennett & Srinivasan (1983) state that "Banner and Blow (1960) considered Ge. aequilateralis (Brady) as a junior synonym of Ge. siphonifera (d'Orbigny), In the present work, we retain the name aequilateralis for the reasons stated by Todd (1963) and Saito et al. (1976)."
Here we follow Aze et al. 2011 in using G.. siphonifera

Catalog entries: Globigerina aequilateralis; Globigerina aequilateralis involuta; Globigerina siphonifera;

Type images:

Short diagnosis: Near planispiral coiling & spherical chambers

Description


Diagnostic characters: Initially trochospiral becoming planispiral, evolute

Aperture: : Interiomarginal wide equatorial arch without rim or lip [Aze 2011, based on Kennett & Srinivasan 1983]

Coiling direction (in extant population): mixed


Wall type: Spinose; Hispid [Aze 2011]

Test morphology: Test low trochospiral in the early stage , nearly planispiral in the adult, evolute; equatorial periphery distinctly lobulate; axial periphery broadly rounded; chambers globular to subglobular, 5 to 6 rapidly enlarging chambers in the final whorl; sutures radial, depressed; surface finely hispid and densely perforate , spinose; spines simple rounded, which become triradiate with growth; surface with uniformly distributed circular pores , interpore area almost smooth; aperture in the adult interiomarginal, wide equatorial arch without a lip or rim. [Kennett & Srinivasan 1983 - as G. aequiateralis]

Size: >250µm

Biogeography and Palaeobiology


Geographic distribution: Tropical to temperate.

Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂13C and relatively heavy ∂18O Cited sources (Aze et al. 2011 appendix S3): Vergnaud-Grazzini (1976)

Phylogenetic relations: Juvenile forms of Ge. aequilateralis (with a distinct trochospiral test) resemble Globigerinella praesiphonifera. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N12 zone (11.79-13.41Ma, base in Serravallian stage). Data source: Kennett & Srinivasan 1983 (recorded as G. aequilateralis)

Plot of occurrence data:

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.

Banner, F.T. & Blow, W.H., (1960). Some primary types of species belonging to the superfamily Globigerinaceae. Contributions from the Cushman Foundation for Foraminiferal Research, 11: 1-41.

Brady, H.B., (1879). Notes on some of the reticularian Rhizopoda of the "Challenger" expedition. I.- On new or little known arenaceous types. Quarterly Journal of Microscopical Science, 19: 20-63.

d'Orbigny, A., (1839). Foraminiferes. In: de la Sagra, R. (Editor), Histoire physique et naturelle de l'Ile de Cuba. A. Bertrand, Paris, France, pp. 224.

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

Saito, T.; Thompson, P.R. & Breger, D. (Editors), (1976). Skeletal ultra-microstructure of some elongate-chambered planktonic foraminifera and related species. Progress in Micropaleontology, Special Publication. Micropaleontology Press, The American Museum of Natural History, New York, 278-304 pp.

Todd 1963 [sorry, not in our bibliography yet]

Vergnaud-Grazzini, C., (1976). Non-equilibrium isotopic compositions of shells of planktonic foraminifera in the Mediterranean Sea. . Palaeogeography, Palaeoclimatology, Palaeoecology, 20: 263-276.


Globigerinella siphonifera compiled by the pforams@mikrotax project team viewed: 23-5-2017

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AphiaID: 113440 Nomenclatural data on WoRMS

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