pforams@mikrotax - Globoturborotalita apertura pforams@mikrotax - Globoturborotalita apertura

Globoturborotalita apertura


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita apertura
Sister taxa: G. rubescens, G. decoraperta ⟩⟨ G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi ⟩⟨ G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides ⟩⟨ G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, G. martini, G. ouachitaensis, G. sp.

Taxonomy

Citation: Globoturborotalita apertura (Cushman 1918)
Rank: species
Basionym: Globigerina apertura Cushman 1918
Synonyms:

Globigerina (Zeaglobigerina) apertura Cushman

Catalog entries: Globigerina apertura

Type images:

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Like G. woodi but with very large 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


Morphology:
Test low trochospiral, chambers spherical to subspherical, increasing uniformly in size as added, four chambers in the final whorl; sutures distinct, slightly curved, depressed, surface cancellate with distinct pores and pore pits, separated by interpore ridges. Aperture umbilical, very large, semi-circular with a distinct apertural rim. [Kennett & Srinivasan 1983]

Wall type:
Spinose; Cancellate [Aze 2011]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin 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:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

A warm subtropical to temperate species. [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 2 - Open ocean mixed-layer tropical/subtropical, without symbionts; based on comparison with other species of the genus.

Phylogenetic relations

G. apertura may be distinguished by its large semicircular aperture and cancellate surface.
The distinctive cancellate surface and apertural rim indicates that G. apertura is phyletically related to G. woodi and cannot be considered as a subspecies of G.bulloides as suggested by Blow (1969).

There is evidence of close phylogenetic relationships among G. apertura, G. decoraperta, and G. woodi. In the Middle Miocene, G. woodi with a very large aperture tends to intergrade with G. apertura, while in the Pliocene, G. apertura tends to intergrade with G. decoraperta. These species have similar surface ultrastructure and consistently have four uniformly increasing chambers in the final whorl. G. apertura developed from G. woodi by an expansion of the aperture. [Kennett & Srinivasan 1983]

Most likely ancestor: Globoturborotalita woodi - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig.8; Aze et al. 2011.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in lower part of PT1a subzone (20% up, 1.6Ma, in Calabrian 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 lower part of M11 zone (42% up, 11.1Ma, in Tortonian 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.44

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

Cushman, J. A. (1918b). Miocene foraminifera of the coastal plain of the United States. U.S. Geological Survey Bulletin. 676: 39-73. gs

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

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

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Globoturborotalita apertura compiled by the pforams@mikrotax project team viewed: 7-6-2023

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