pforams@mikrotax - Globoturborotalita paracancellata pforams@mikrotax - Globoturborotalita paracancellata

Globoturborotalita paracancellata


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita paracancellata
Sister taxa: G. bollii, 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 paracancellata Olsson&Hemleben, in Spezzaferri et al. 2018
taxonomic rank: species
Taxonomic discussion:

Blow and Banner (1962) derived “ Globigerinoides” from their subspecies Globigerina praebulloides occlusa. However, we do not retain here this lineage (see Chapter 9, this volume). According to our observations, the origin of the genus Trilobatus is preceded by morphotypes typified by Globoturborotalita paracancellata n. sp., which is hypothesized as the ancestral species.[Spezzaferri et al. 2018]

Catalog entries: Globoturborotalita paracancellata

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. cancellata but only 3½ chambers in the final whorl and final chamber forms about ½ the test. 

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:
Low trochospiral, consisting of 3 whorls, globular, moderately lobulate profile, chambers globular; in spiral view 3½ globular, slightly embracing chambers in ultimate whorl, increasing rapidly in size, sutures depressed, straight; in umbilical view 3½ globular, slightly embracing chambers, increasing rapidly in size, sutures depressed, straight, umbilicus small, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by a thin thickened rim; in edge view chambers globular, slightly embracing, initial whorl of chambers flat. [Spezzaferri et al. 2018]

Wall type:
Normal perforate, spinose, ruber/sacculifer-type wall texture, an average of 17 pores/50 μm2 test surface area.

Size:
Maximum diameter of holotype 0.43 mm, minimum diameter 0.32 mm, thickness 0.30 mm. [Spezzaferri et al. 2018]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick 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:3.5-3.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Known so far in the western Atlantic Ocean and the U.S. Gulf Coast. Probably widespread in low to middle latitudes due to its ancestry to Trilobatus primordius. [Spezzaferri et al. 2018]

Isotope paleobiology
No data available. [Spezzaferri et al. 2018]

Phylogenetic relations
The species name paracancellata is chosen because it is believed that this species evolved from Globoturborotalita cancellata by a more rapid increase in chamber size and having 3½ chambers in the ultimate whorl and developing a ruber/sacculifer-type wall texture. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita cancellata - at confidence level 3 (out of 5). Data source: .
Likely descendants: Globoturborotalita brazieri; Trilobatus primordius; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: The illustrated specimens on Plate 8.12 range from Zone O1 to Zone O6. We have identified the species in samples from the uppermost Eocene Zone E16. [Spezzaferri et al. 2018]
Last occurrence (top): within O6 zone (25.21-26.93Ma, top in Chattian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within E16 zone (33.90-34.68Ma, base in Priabonian stage). Data source: Spezzaferri et al. 2018

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.259

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E., Banner, F. T., Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 8): 231-268. gs

Wade, B. S., Aljahdali, M. H., Mufrreh, Y. A., Memesh, A. M., AlSoubhi, S. A. & Zalmout, I. S. (2021). Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges. Journal of Micropalaeontology. 40: 145-161. gs O

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Globoturborotalita paracancellata compiled by the pforams@mikrotax project team viewed: 11-9-2024

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