Globorotalia praescitula


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia praescitula
Sister taxa: G. hirsuta, G. theyeri, G. margaritae, G. juanai, G. bermudezi, G. scitula, G. praescitula, G. cibaoensis, G. gigantea, G. challengeri,

Taxonomy

Citation: Globorotalia praescitula Blow, 1959
Rank: species
Basionym: Globorotalia scitula praescitula
Synonyms:
Variants:

Catalog entries: Globorotalia scitula praescitula, Globorotalia quinifalcata

Type images:

Distinguishing features: Like G. zealandica but more chambers in final whorl (4½ vs 4), increased curvature of the sutures on the umbilical side, peripheral compression, and a return to a low-arched aperture

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, biconvex, equatorial periphery subangular

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


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

Test morphology: Test low trochospiral, biconvex, equatorial periphery subangular, but not keeled, although some peripheral thickening occurs on the earlier chambers; chamber four to four and one-half in the final whorl, increasing slowly in size; sutures on the spiral side strongly curved , depressed, on umbilical side slightly sinuous to radial, depressed; umbilical side distinctly convex to rather vaulted. Surface uniformly perforate, smooth; umbilicus small; aperture interiomarginal, umbilical-extraumbilical a low arch with a thin lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture: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:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Temperate to tropical. [Kennett & Srinivasan 1983] Low to middle 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): Pearson et al. (2001b)

Phylogenetic relations: Gr. (G.) praescitula is distinguished from its ancestor Gr. (G.) zealandica by an increase in number of chambers in the final whorl from four to four and one-half, an increase in curvature of the sutures on the umbilical side, peripheral compression, and a return to a low-arched aperture. Srinivasan and Kennett (1981b) described the evolution of Gr. (G.) zealandica to Gr. (G.) praescitula. This taxon, originally a temperate form, gave rise during the late Early Miocene to two of the most important Neogene globorotaliid lineages: the middle to late Neogene Globoconella of temperate areas (Text Fig. 13), and the middle to late Neogene Menardella of the tropics (Text Fig. 14). [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia zealandica - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983.
Likely descendants: Globoconella miozea; Globoconella panda; Globorotalia archeomenardii; Globorotalia challengeri; Globorotalia scitula;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near top of M9b subzone (86% up, 12Ma, in Serravallian 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).
First occurrence (base): in upper part of M3 zone (57% up, 18.3Ma, in Burdigalian 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.108

References:

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

Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs

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

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Pearson, P. N. et al. (2001a). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature. 413: 481-487. gs

Saito, T. & Maiya, S. (1973). Planktonic foraminifera of the Nishikurosawa Formation, northeast Honshu, Japan. Transactions and Proceedings of the Paleontological Society of Japan, New Series. 91(1): 113-125. gs

Srinivasan, M. S. & Kennett, J. P. (1981b). Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, south Pacific. Marine Micropaleontology. 6: 499-533. 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 praescitula compiled by the pforams@mikrotax project team viewed: 16-12-2019

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