pforams@mikrotax - Globoturborotalita gnaucki

Citation: Globoturborotalita gnaucki (Blow & Banner 1962)

Basionym: Globigerina ouachitaensis gnaucki

Synonyms:

Globigerina ouachitaensis Howe and Wallace, 1932, (partim. paratype, not holotype) [Zone E15/16, Danville Landing, Louisiana]. [Not Howe and Wallace, 1932.]
Globigerina ouachitaensis Howe and Wallace.—Charollais and others, 1980:64, pl. 6, figs. 14-17 [lower Oligocene, France]. [Not Howe and Wallace, 1932.]
Globigerina ouachitaensis gnaucki Blow and Banner, 1962:91, pl. IX, figs. l-n, holotype [lower Oligocene Globigerina oligocaenica Zone, Sample FCRM 1965, Lindi area, Tanzania].—Blow, 1969:320, pl. 2, figs. 1-3 (holotype re-illustrated).—Bolli and Saunders, 1985:182, fig. 13.16a-c (holotype re-illustrated).
Globoturborotalita gnaucki (Blow and Banner, 1962).—Olsson and others, 2006:118, pl. 6.4, figs. 5-14 [upper Eocene, Zone E15/E16, Shubuta Clay, Yazoo Fm., Wayne Country, Mississippi].

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]

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Test small, lobulate, with slightly embracing, globular chambers. Aperture large, umbilical. Wall texture cancellate.

Description

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]

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

Maximum diameter 0.25-0.36 mm, minimum diameter 0.23-30 mm, maximum width 0.19 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

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

No data available. [Spezzaferri et al. 2018]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts; based on comparison with other species of the genus.

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]

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

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 O

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

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). 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 16): 461-508. gs O

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006a). 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 O

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 O

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. (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., 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

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

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Concavo-convex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4-4.5	N.B. These characters are used for advanced search. N/A - not applicable

Globoturborotalita gnaucki

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments