pforams@mikrotax - Globorotalia scitula

Citation: Globorotalia scitula (Brady, 1882)

Basionym: Pulvinulina scitula Brady, 1882

Synonyms:

Globorotalia (Hirsutella) scitula (Brady, 1882) [e.g. Kennett & Srinivasan 1983]
Globigerina depressa d'Orbigny, in Fornasini 1903 [according to Banner & Blow 1960 the holotype exists and is identifable as G. scitula but the name is a junior homonym of G. depressa Ehrenberg 1844]

Variants:

Globorotalia subscitula Conato [according to Kennett & Srinivasan 1983]
Globorotalia wilesi Thompson [according to Kennett & Srinivasan 1983, Brummer & Kucera 2022]
Globorotalia bermudezi Rogl & Bolli (1973) - small with an open umbilicus [synonym according to Brummer & Kucera 2022, although regarded as a separate species by Kennett & Srinivasan 1983 and by Aze et al. 2011]

Distinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Like G. praescitula but smooth surface and subcircular outline

Description

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]

Biogeography and Palaeobiology

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]

Map of distribution from ForCenS database

Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light δ¹³C and very heavy δ¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Shackleton & Vincent (1978); D. R. M. Stewart unpublished data

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.

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

References:

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

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 O

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:. Proceedings of the Royal Society of Edinburgh. XI: 708-717. gs

Fornasini, C. (1903a). Sopra alcune specie di "Globigerina" istituite da d'Orbigny nel 1826. Memorie della Reale Accademia della scienze dell'Istituto di Bologna. 7: +140+-. gs

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

King, D. J., Wade, B. S. & Giles Miller, C. G. (2023). Biostratigraphic utility of coiling direction in Miocene planktonic foraminiferal genus Paragloborotalia. Newsletters on Stratigraphy. 56(3): 331-355. gs

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. 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 O

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

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

Siccha, M. & Kucera, M. (2017). ForCenS, a curated database of planktonic foraminifera census counts in marine surface sediment samples. Scientific Data. 4(1): 1-12. gs

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Miocene climate change. PhD thesis, Bristol University. 1-269. gs O

test outline:	Subcircular	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	N/A	aperture border:	Thick lip
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Narrowly rounded	accessory apertures:	None
spiral sutures:	Flush	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Weakly depressed	final-whorl chambers:	4-5	N.B. These characters are used for advanced search. N/A - not applicable

Globorotalia scitula

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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