Neogloboquadrina humerosa


Classification: pf_cenozoic -> Globorotaliidae -> Neogloboquadrina -> Neogloboquadrina humerosa
Sister taxa: N. pachyderma, N. incompta, N. inglei, N. dutertrei, N. humerosa, N. acostaensis, N. atlantica, N. sp.,

Taxonomy

Citation: Neogloboquadrina humerosa (Takayanagi & Saito, 1962)
Rank: species
Basionym: Globorotalia humerosa Takayanagi & Saito, 1962

Catalog entries: Globorotalia humerosa

Type images:

Distinguishing features: Like N. acostaensis but 6+ chambers in final whorl, wider umbilicus, and reduced apertural lip.

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: Low trochospiral, equatorial periphery lobulate, chambers ovate

Aperture: Interiomarginal umbilical-extraumbilical low to medium arch with distinct rim [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test low trochospiral, equatorial periphery lobulate; axial periphery rounded , chambers ovate, 6 to 7 in the final whorl, final often irregular; sutures on both spiral and umbilical sides radial, depressed; surface distinctly cancellate ; umbilicus wide , deep; aperture interiomarginal, umbilical-extraumbilical, a low to medium arch bordered by a distinct rim.

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >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. Low 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 comparison with other species of the genus

Phylogenetic relations: N. humerosa differs from its fore-runner N. acostaensis in having more chambers in the final whorl (usually 6 or more), a wider umbilicus, and a reduced apertural lip. This species is distinguished from N. dutertrei by having an interiomarginal , umbilical-extraumbilical aperture with a distinct rim, and an absence of umbilical plates.
N. humerosa occurs throughout the tropical to warm subtropical areas and represents the warmer-water variant of a latitudinal cline, grading into the temperate form N. subcretacea (Srinivasan and Kennett,1976). N. humerosa is also evolutionarily intermediate between N. acostaensis and N. dutertrei.

Most likely ancestor: Neogloboquadrina acostaensis - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 21; Aze et al. 2011.
Likely descendants: Neogloboquadrina dutertrei;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within PT1a subzone (0.61-1.88Ma, top in Ionian stage). Data source: Chaisson & Pearson (1997)
First occurrence (base): at base of M13b subzone (0% up, 8.6Ma, in Tortonian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.196

References:

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

Chaisson, W. P. & Pearson, P. N. P. (1997). Planktonic foraminifer biostratigraphy at Site 925: Middle Miocene–Pleistocene. Proceedings of the Ocean Drilling Program, Scientific Results,. 154: 3-31. gs

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

Loeblich, A. & Tappan, H. (1994). Foraminifera of the Sahul shelf and Timor Sea. Cushman Foundation for Foraminiferal Research, Special Publication. 31: 1-661. gs

Srinivasan, M. S. & Kennett, J. P. (1976b). Evolution and phenotypic variation in the Late Cenozoic Neogloboquadrina dutertrei plexus. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology. American Museum of Natural History Micropaleontology Press, New York 329-355. gs

Takayanagi, Y. & Saito, T. (1962). Planktonic foraminifera from the Nobori formation, Shikoku, Japan. Science Reports of the Tohoku University. 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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Neogloboquadrina humerosa compiled by the pforams@mikrotax project team viewed: 12-11-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104176 Go to Archive.is to create a permanent copy of this page - citation notes



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