Globorotalia hirsuta


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia hirsuta
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 hirsuta (d’Orbigny, 1839)
Rank: species
Basionym: Rotalina hirsuta
Taxonomic discussion: neotype designated by Banner & Blow 1960

Catalog entries: Rotalina hirsuta

Type images:

Distinguishing features: Distinguished by its thick, relatively high-spired test, 4 chambers in the final whorl, and pustulose surface.

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: Large, high trochospiral, highly convex on spiral side, concave on umbilical side

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

Coiling direction (in extant population): mixed with bias to dextral


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

Test morphology: Test large, high trochospiral,highly convex on spiral side, concave on umbilical side, equatorial periphery ovate weakly lobu- late, axial periphery biconvex, strongly tumid on spiral side; four chambers in the final whorl, increasing rapidly in size; sutures on spiral side strongly curved, depressed, on umbilical side sinuously radial , depressed; surface covered with pustular projections, concealed on early chambers by secondary thickening , finely perforate; umbilicus narrow, deep; aperture a low slit with an indistinct lip, interiomarginal, extraumbilical-umbilical.  [Kennett & Srinivasan 1983]

Size: >250µm

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: 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 comparison with other species of the genus

Phylogenetic relations: This species evolved from G. (H.) margaritae in the Late Pliocene by a reduction in the chamber number in the final whorl from 5 to 4 and by becoming strongly concave on the umbilical side and developing a pustulose surface (Banner and Blow, 1967; Parker, 1973). [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from 79 sequences. References: André et al. 2014; Ujiié & Lipps 2009.

Most likely ancestor: Globorotalia theyeri - at confidence level 1 (out of 5). Data source: Published sources (Kennett & Srinivasan 1983, fig 15; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5) indicate G. margaritae as the ancestor of G. hirsuta, however on modern species concepts there is a range gap of >3Ma between the top of G. margaritae and the base of G. hirsuta, both of which are well-calibrate biostratigraphic events. So an alternative of ancestry from G. theyeri is indicated here. .

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): in lower part of PT1b subzone (26% up, 0.5Ma, in Ionian 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.138

References:

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

d'Orbigny, A. (1839b). Foraminifères des Iles Canaries. In, Barker-Webb, P. & Berthelot, S. (eds) Histoire naturelle des Iles Canaries. 120-146. 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

Ujiié, Y. & Lipps, J. H. (2009). Cryptic diversity in planktonic foraminifera in the northwest Pacific ocean. Journal of Foraminiferal Research. 39: 145-154. gs


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Globorotalia hirsuta compiled by the pforams@mikrotax project team viewed: 22-10-2019

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