Turborotalita cristata


Classification: pf_cenozoic -> Globigerinidae -> Turborotalita -> Turborotalita cristata
Sister taxa: T. clarkei, T. cristata, T. humilis, T. quinqueloba, T. praequinqueloba, T. carcoselleensis, T. sp.,

Taxonomy

Citation: Turborotalita cristata (Heron-Allen & Earland, 1929)
Rank: species
Basionym: Globigerina cristata Heron-Allen & Earland, 1929
Taxonomic discussion: "Saito et al. (1981) considered Ta. cristata as a junior synonym of Turborotalita humilis. However, Ta. cristata can be distinguished from Ta. humilis by its radially elongate later chambers in the final whorl, short conical spines concentrated along the periphery, lack of large pores, and an absence of a tongue-like extension of the final chamber." [Kennett & Srinivasan 1983].
Not recognised by SCOR WG138.
The type specimens were designated by Banner & Blow 1960

Catalog entries: Globigerina cristata

Type images:

Distinguishing features: radially elongate chambers in the 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


Diagnostic characters: Minute, very low trochospiral, equatorial periphery distinctly lobulate, short conical spine along periphery

Aperture: Interiomarginal umbilical-extraumbilical low arch bordered by thin lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test minute, very low trochospiral, loosely coiled, equatorial periphery distinctly lobulate; axial periphery rounded; chambers oval, radially elongate, 7 in the final whorl; sutures on both spiral and umbilical side radial depressed; surface smooth, translucent, almost imperforate to very finely perforate (PI. 41, Fig. 2) with short, conical spines concentrated along the periphery; aperture a low arch bordered by a thin lip, interiomarginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

Character matrix

test outline:Stellatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Bulla
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Infralaminal
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on ∂13C lighter than species with symbionts; also with relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations: Ta. cristata appears to have developed from Ta. humilis during the early Pleistocene. [Kennett & Srinivasan 1983]

Most likely ancestor: Turborotalita humilis - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 18.
Likely descendants: Turborotalita clarkei;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Regarded as extant by Kennett & Sirinivasan 1983 but not recognised by SCOR WG138
First occurrence (base): within N22 zone (0.00-1.93Ma, base in Gelasian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.168

References:

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

Heron-Allen, A. & Earland, A. (1929). Some new foraminifera from the South Atlantic. Journal of the Royal Microscopical Society of London, Series 3. 49(4): +331+-. gs

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

Saito, T., Thompson, P. R. & Breger, D. (1981). Systematic Index of Recent and Pleistocene Planktonic Eoraminifera. University of Tokyo Press, Tokyo. 1-190. gs


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Turborotalita cristata compiled by the pforams@mikrotax project team viewed: 17-11-2019

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