Globorotalia tosaensis


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> truncatulinoides lineage -> Globorotalia tosaensis
Sister taxa: G. excelsa, G. pachytheca, G. cavernula, G. truncatulinoides, G. tosaensis, G. tenuitheca ⟩⟨ G. hessi, G. ronda, G. crassaformis, G. viola ⟩⟨ G. crassaconica, G. crassula

Taxonomy

Citation: Globorotalia tosaensis Takayanagi & Saito 1962
Rank: species
Basionym: Globorotalia tosaensis
Synonyms:

Catalog entries: Globorotalia tosaensis

Type images:

Distinguishing features: Low trochospiral, strongly umbilico-convex with flat spiral side, commonly 5 chambers in final whorl

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


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

Morphology: Test low trochospiral, spiral side flat to concave, umbilical side strongly convex giving the test a corncal appearance; equatorial periphery almost circular; axial periphery subrounded to subacute; chambers inflated, commonly 5 in the final whorl, increasing fairly rapidly in size; sutures on spiral side gently curved and somewhat flush to gently depressed, on umbilical side almost radial, depressed, surface finely perforate, pustulate on umbilical side and on early chambers on spiral side; umbilicus narrow, deep; aperture interiomarginal, extraumbilical-umbilical, a low slit bordered by a lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Narrowly roundedaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Warm sub- tropical to tropical; Rare in temperate regions. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light ∂13C and very heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Shackleton & Vincent (1978)

Phylogenetic relations: Gr. (T.) tosaensis resembles Gr. (T.) truncatulinoides in general appearance but is distinguished primarily by the absence of a peripheral keel (PI. 34; Fig. 1). It differs from Gr. (T.) crassaformis in its rounded equatorial profile and by having more than four chambers in the final whorl.
Gr. (T.) tosaensis evolved during the Late Pliocene from Gr. (T.) crassaformis via the Gr. (T.) crassaformis ronda morphotype. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia tenuitheca - at confidence level 2 (out of 5). Data source: Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia excelsa; Globorotalia pachytheca; Globorotalia truncatulinoides;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at base of PT1b subzone (1% up, 0.6Ma, in "Holocene" stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): in upper part of PL5 [Atl.] zone (72% up, 2.6Ma, in Piacenzian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.148

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. 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. (2020). 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

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Shackleton, N. J. & Vincent, E. (1978). Oxygen and carbon isotope studies in Recent Foraminifera from the southeast Indian Ocean. Marine Micropaleontology. 3: 1-13. gs

Takayanagi, Y. & Saito, T. (1962). Planktonic foraminifera from the Nobori formation, Shikoku, Japan. Science Reports of the Tohoku University, Series 2 (Geology). 2(5): 67-105. gs

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs


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Globorotalia tosaensis compiled by the pforams@mikrotax project team viewed: 15-4-2021

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