Globoturborotalita rubescens


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita rubescens
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 rubescens (Hofker, 1956)
Rank: species
Basionym: Globigerina rubescens
Synonyms:

Globigerina (Zeaglobigerina) rubescens

Variants:

Catalog entries: Globigerina rubescens, Globoturborotalita decorata

Type images:

Distinguishing features: Like G. decoraperta but very small and with small circular 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, trochospiral, equatorial periphery lobulate, chambers spherical to subspherical

Aperture: Umbilical small rounded opening bordered by a distinct rim [Aze 2011, based on Kennett & Srinivasan 1983]

Coiling direction (in extant population): mixed


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test small, trochospiral, equatorial periphery lobulate, chambers spherical to subspherical, four in the final whorl, increasing rapidly in size as added; sutures on both sides radial to slightly curved, gently depressed; surface distinctly cancellate; aperture small, rounded, bordered by a distinct rim, umbilical. [Kennett & Srinivasan 1983]

Size: <150µm

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: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 tropical to sub- tropical species. [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: This species is distinguished from Gg. (Zg.) decoraperta by its very small test size and small circular aperture. Gg. (Zg.) rubescens seems to have evolved from Gg. (Zg.) decoraperta during the Middle Pliocene and may be the modern representative of the subgenus Zeaglobigerina. Hofker 1977) placed this species within Globoturborotalita, which may have priority over Zeaglobigerina if Gg. (Zg.) rubescens is phylogenetically linked with the Zeaglobigerina lineage. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from 9 sequences. Reference: Seears et al. 2012.

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

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N20 zone (3.10-4.37Ma, base in Zanclean stage). Data source: Chaisson & Pearson (1997)

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.50

References:

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

Hofker, J. (1956c). Foraminifera of Santa Cruz and Thatch-Island, Virginia-Archipelago West-Indies. Copenhagen Univ. Zool. Mus. Spolia (Skrifler). 15: 1-237. 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

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

Todd, R. (1957). Smaller foraminifera, in Geology of Saipan, Mariana Islands, Pt. 3, Paleontology. U. S. Geological Survey, Professional Paper. 280-H: 265-320. gs


logo

Globoturborotalita rubescens compiled by the pforams@mikrotax project team viewed: 17-11-2019

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=104156 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics