Globoturborotalita gnaucki


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita gnaucki
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 gnaucki (Blow & Banner 1962)
Rank: Species
Basionym: Globigerina ouachitaensis gnaucki
Synonyms:
Taxonomic discussion:

The holotype of Globoturborotalita gnaucki is illustrated in SEM for the first time (Pl.6.4: Figs. 1-4). Blow (1979) considered Globigerina gnaucki as a possible junior synonmy of Globigerina fariasi Bermude½z, but that species has 5 to 6 chambers in the ultimate whorl and a very large open umbilicus. Globoturborotalita gnaucki is a distinctive form in the upper Eocene and lower Oligocene and is here elevated to species level. We include a paratype of Globigerina ouachitaensis Howe and Wallace, illustrated in SEM for the first time (Pl.6.4: Fig. 15) in this species. The species originated during the late Eocene radiation of Globoturborotalita. We place Howe and Wallace’s (1932) paratype of Globigerina ouachitaensis in synonymy. [Olsson et al. 2006]

Catalog entries: Globigerina ouachitaensis gnaucki

Type images:

Distinguishing features: Test small, lobulate, with slightly embracing, globular chambers. Aperture large, umbilical. Wall texture cancellate.

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:

Globoturborotalita gnaucki differs from the other species belonging to the genus Globoturborotalita by the more evolute coiling and lobulate profile, the presence of 4½ globular, slightly embracing chambers in the ultimate whorl compared with 3½-4 in the other species, and in having a more open and higher aperture. It further differs from G. ouachitaensis, to which it is most closely related, by the size of the final chamber, which is larger than the penultimate in G. gnaucki but of similar size or smaller than the ultimate chamber in G. ouachitaensis, and the absence of a thickened lip. [Spezzaferri et al. 2018]


Wall type: Cancellate, normal perforate, spinose, ruber/sacculifer-type wall texture, an average of 30 pores/50 μm2 test surface area. [Spezzaferri et al. 2018]

Test morphology: Test moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 4½ globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, sutures depressed, straight; in umbilical view 4½ globular, slightly embracing chambers, increasing moderately in size, sutures depressed, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by a thin thickened rim; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated. [Spezzaferri et al. 2018]

Size: Maximum diameter 0.25-0.36 mm, minimum diameter 0.23-30 mm, maximum width 0.19 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:N/A
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:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: This species is distributed in mid to low latitudes. [Spezzaferri et al. 2018]

Isotope paleobiology: No data available. [Spezzaferri et al. 2018]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on δ13C lighter than species with symbionts; also with relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study - i.e. inferred from closely related species.

Phylogenetic relations: Globoturborotalita gnaucki derived from Globoturborotalita ouachitaensis by an increase in the number of chambers in the ultimate whorl to 4½ and by losing the thickened lip. It gave rise to Ciperoella anguliofficinalis in upper Eocene Zone E16 and it is therefore ancestral to the genus Ciperoella n. gen. (Chapter 7, this volume). [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita ouachitaensis - at confidence level 4 (out of 5). Data source: Olsson et al. 2006, f5.1.
Likely descendants: Ciperoella anguliofficinalis;

Biostratigraphic distribution

Geological Range:
Notes: This species appears in the upper Eocene Zone E15. We have observed it in ranging up to the lower Oligocene Zone O4 in Trinidad (Plate 8.7). [Spezzaferri et al. 2018]
Last occurrence (top): within O4 zone (28.09-29.18Ma, top in Rupelian stage). Data source: ESpezzaferri et al. 2018
First occurrence (base): in mid part of E15 zone (50% up, 35.3Ma, in Priabonian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.248; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 118

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

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

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Bolli, H. M. & Saunders, J. B. (1985). Oligocene to Holocene low latitude planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 155-262. gs

Charollais, J. et al. (1980). Les Marnes a foraminiferes et les schistes a Meletta des chaines subalpines septentrionales (Haute-Savoie, France). Eclogae Geologicae Helvetiae. 73(1): 9-69. gs

Howe, H. V. & Wallace, W. E. (1932). Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catahoula Parish, Louisiana. Bulletin of the Geological Survey of Louisiana. 2: 1-118. gs

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 6): 111-168. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 5): 67-110. gs

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018c). 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., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs


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Globoturborotalita gnaucki compiled by the pforams@mikrotax project team viewed: 15-12-2019

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