Globoturborotalita tenella


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita tenella
Sister taxa: G. tenella, 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 tenella (Parker, 1958)
Rank: species
Basionym: Globigerinoides tenellus Parker, 1958

Catalog entries: Globigerinoides tenella

Type images:

Distinguishing features: Like G. rubescens but with a small, supplementary 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: Small, low trochospiral, chambers spherical

Aperture: Primary aperture umbilical large almost circular opening with distinct rim small supplementary aperture on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]

Coiling direction (in extant population): mixed


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test small, low trochospire , chambers spherical, four in the final whorl, rapidly increasing in size as added; sutures cllrved and depressed; surface distinctly cancellate with pores set in polygonal pore pits; primary aperture umbilical large, almost circular in outline, with a distinct rim; single small, supplementary aperture on spiral side at intersection of spiral and intercameral sutures. [Kennett & Srinivasan 1983]

Size: >250µm

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Sutural
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: Tropical to temperate. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

In modern oceans a common, warm water, species [SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on ∂13C lighter than species with symbionts; also with relatively light ∂18O Cited sources (Aze et al. 2011 appendix S3): this study

Phylogenetic relations: Gs. tenellus is similar to Globigerina (Zeaglobigerina) rubescens in all respects except for the development of a small, supplementary aperture. This species evolved from Gg. (Zg.) rubescens in the Late Pliocene. [Kennett & Srinivasan 1983]

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

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N21 zone (1.93-3.10Ma, base in Piacenzian stage). Data source: Chaisson & Pearson (1997)

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.80 (as Globigerinoides tenellus)

References:

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

Parker, F. L. (1958). Eastern Mediterranean foraminifera. Reports of the Swedish Deep-Sea Expedition, 1947-1948. 8(4): 217-283. gs


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Globoturborotalita tenella compiled by the pforams@mikrotax project team viewed: 13-12-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104070 Go to Archive.is to create a permanent copy of this page - citation notes



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