Turborotalita humilis


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

Taxonomy

Citation: Turborotalita humilis (Brady, 1884)
Rank: species
Basionym: Truncatulina humilis
Synonyms: T. cristata[SCOR-WG]

Catalog entries: Truncatulina humilis

Type images:

Distinguishing features: Six or more chambers

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, low trochospiral, equatorial periphery almost circular, tongue-like extension of the final chamber over the umbilicus

Aperture: Interiomarginal umbilical-extraumbilical except when covered by tongue-like extension. Several infralaminal apertures present [Aze 2011, based on Kennett & Srinivasan 1983]

Coiling direction (in extant population): mixed


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test minute, low trochospiral, equatorial periphery almost circular, lobulate; axial periphery rounded; si6x subspherical chambers in the final whorl, increasing uniformly in size as added; tongue-like extension of the final chamber over the umbilicus having several infralaminal apertures; sutures radial and depressed; surface smooth, very finely perforate , larger pores concentrated along the periphery; aperture (except when covered by bulla) interiomarginal, urnbilical-extraumbilical. [Kennett & Srinivasan 1983]

Size: <150µm

Character matrix

test outline:Lobatechamber 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:6.0-6.0 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)]

In modern oceans a common, temperate water, species [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. humilis is distinguished from Globigerina (Globigerina) quinqueloba by its smaller size, more numerous chambers in the final whorl, and microperforate wall and larger pores concentrated along the periphery. [Kennett & Srinivasan 1983]

Most likely ancestor: Turborotalita quinqueloba - at confidence level 3 (out of 5). Data source: Aze et al. 2011. NB Kennett & Srinivasan 1983, showed origin from Tenuitella clemenciae in fig. 18 bt in the text mentioned close similarities to T. quinqueloba .
Likely descendants: Turborotalita cristata;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): in upper part of M14 [Atl.] zone (78% up, 5.8Ma, in Messinian 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.167

References:

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

Brady, H. B. (1884). Report on the Foraminifera dredged by H.M.S. Challenger, during the years 1873-1876. Rep. Sci. Results H.M.S. Challenger 1873-6. 9 (Zoology): 1-814. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. 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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Turborotalita humilis compiled by the pforams@mikrotax project team viewed: 21-8-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104249 Go to Archive.is to create a permanent copy of this page - citation notes



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