Globorotalia scitula


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia scitula
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 scitula (Brady, 1882)
Rank: species
Basionym: Pulvinulina scitula Brady, 1882
Synonyms:
Variants:

Catalog entries: Pulvinulina scitula, Globorotalia bermudezi, Globorotalia scitula subscitula, Globorotalia wilesi

Type images:

Distinguishing features: Like G. praescitula but smooth surface and subcircular outline

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: Medium to low trochospiral, equatorial periphery slightly lobulate with keel-like rim

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

Coiling direction (in extant population): sinistral


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

Test morphology: Test medium to low trochospiral, biconvex , equatorial periphery slightly lobulate, axial periphery subangular to angular with a keel-like rim; chambers strongly compressed, crescent shaped, 4 to 5 in the final whorl, increasing moderately in size as added; sutures on spiral side strongly curved, slightly raised; on umbilical side, radial to slightly curved, depressed;, surface smootli, penetrated by numerous circular pores (PI. 31, Fig. 1), slightly pustulose on early chambers on umbilical side, umbilicus narrow, shallow; aperture interiomarginal, umbilical- extniumbilical, a low slit with a pronounced lip. [Kennett & Srinivasan 1983]

Size: >150µm

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thick 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: Tropical to temperate. [Kennett & Srinivasan 1983] Low to middle latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

In modern oceans an abundant, temperate water, species [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); D. R. M. Stewart unpublished data

Phylogenetic relations: This species is distinguished from Gr. (G.) praescitula by its smooth surface and subcircular outline. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from 51 sequences. References: Seears et al. 2012.

Most likely ancestor: Globorotalia praescitula - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 15; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia bermudezi; Globorotalia cibaoensis; Globorotalia gigantea; Globorotalia juanai;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N9 zone (14.24-15.10Ma, base in Langhian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.134

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. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

Brady, H. B. (1882). Report on the Foraminifera. In Tizard and Murray, Exploration of the Faroe Channel, during the summer of 1880, in H.M.S. "Knight Errant," with subsidiary reports:. Proc. Roy. Soc. Edinburgh. XI: 708-717. 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

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

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

Seears, H. A., Darling, K. F. & Wade, C. M. (2012). Ecological partitioning and diversity in tropical planktonic foraminifera. BMC Evolutionary Biology. 12(54): 1-15. 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

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Micoene climate change. In, p269 (ed.) . Earth Sciences. 1-269. gs


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Globorotalia scitula compiled by the pforams@mikrotax project team viewed: 8-12-2019

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