pforams@mikrotax - Globoturborotalita bassriverensis

pforams@mikrotax - Globoturborotalita bassriverensis pforams@mikrotax - Globoturborotalita bassriverensis

Globoturborotalita bassriverensis

Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita bassriverensis
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.

Eocene_Atlas_pl06-3_fig9-11.jpg
Olig Atlas pl08-01 11-13.JPG
Eocene_Atlas_pl06-3_fig15.jpg
Eocene_Atlas_pl06-3_fig4-8.jpg

Taxonomy

Citation: Globoturborotalita bassriverensis Olsson & Hemleben, in Olsson et al. 2006

taxonomic rank: Species

Basionym: Globoturborotalita bassriverensis Globigerinatheka

Synonyms:

Globoturborotalita bassriverensis Olsson and Hemleben, 2006:117, pl. 6.3, figs. 1-14 [lower Eocene Zone E1, ODP 174AX, 1150.0-1169.2 feet, Bass River, New Jersey].—Pearson and Wade, 2015, fig. 9.6a-b [upper Eocene Zone E15/16, Sample TDP12/40/3, 88-96 cm, Tanzania].

Taxonomic discussion: Globoturborotalita bassriverensis is described from an exceptionally well-preserved assemblage of planktonic foraminifera from a Zone E1 section in the Bass River Borehole, ODP 174AX, New Jersey Coastal Plain. The assemblage from which this species is described is associated with the carbon isotope excursion (CIE) and the Paleocene-Eocene Thermal Maximum (PETM). In addition, the excursion taxa (Kelly and others, 1996), Acarinina africana, A. sibaiyaensis, and Morozovella allisonensis also occur in this E1 assemblage. The bassriverensis morphology has not been observed in the Paleocene (Olsson and others, 1999). Thus, it appears that the origin of Globoturborotalita is related to climate-induced changes in the structure of water masses during the PETM. The genus was apparently derived from Subbotina because of its symmetrical sacculifer-type, spinose wall texture and umbilically directed aperture. Specimens are quite common but have probably been overlooked because of their small size. [Olsson et al. 2006]

This species was described from lower Eocene Zone E1 and is more typical of the Eocene than the Oligocene (see Olsson and others, 2006 for the complete description, synonymy and discussion). Initially reported as ranging to Zone E10 (Olsson and others, 2006), it is here included for completeness because new observations have extended its range to the lower Oligocene Zone AO1 (Pl. 8.1, Figs. 11-14). Four specimens that were originally figured as G. bassriverensis by Olsson and others (2006) in plate 6.3, figs. 16-19, are here assigned to Globoturborotalita eolabiacrassata Spezzaferri and Coxall n. sp. (Pl. 8.5) based on their more compact profile and possession of a thickened rim bordering the aperture. The Globoturborotalita bassriverensis diagnosis, therefore, is restricted to forms with a more enclosing globular final chamber and a thin apertural lip. [Spezzaferri et al. 2018]

Catalog entries: Globoturborotalita bassriverensis

Type images:

holotype: G. bassriverensis
holotype: G. bassriverensis
paratype: G. bassriverensis

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, 4 globular, slightly embracing chambers in final whorl. Aperture umbilical with prominent lip, wall 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

Morphology:

Test moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 4 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, sutures depressed, straight, last 4 chambers make up about 1/2 of the test size; in umbilical view 4 globular, slightly embracing chambers, increasing moderately in size, sutures depressed, straight, umbilicus small, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by a narrow lip that is thickened in some specimens; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated.

Wall type:

Olig Atlas pl08-01 14.JPG

Cancellate, normal perforate, spinose, sacculifer-type wall structure.

Character matrix
test outline: Lobate chamber arrangement: Trochospiral edge view: Concavo-convex aperture: Umbilical
sp chamber shape: Globular coiling axis: Moderate periphery: N/A aperture border: Thick lip
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 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Distributed in mid- to low latitudes. [Olsson et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (2006a)

Isotope paleobiology

Recorded (as ‘small globigeriniforms’) by Pearson and others (2001) from the middle Eocene of Tanzania with relatively negative δ18O indicating a shallow water habitat. [Olsson et al. 2006]
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. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (2001a)

Phylogenetic relations

Globoturborotalita bassriverensis is the first species in a generic line that extends to the Recent. The probable ancestor is Subbotina hornibrooki. [Olsson et al. 2006]

Most likely ancestor: Subbotina hornibrooki - at confidence level 3 (out of 5). Data source: Olsson et al. 2006, f5.1.
Likely descendants: Globoturborotalita cancellata; Globoturborotalita eolabiacrassata; Globoturborotalita martini; Globoturborotalita ouachitaensis; Turborotalita carcoselleensis; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Zone E1 to Zone E10? [Olsson et al. 2006] Initially reported as ranging to Zone E10 (Olsson et al., 2006), new observations have extended its range to the lower Oligocene Zone AO1 [Spezzaferri et al 2018]
Last occurrence (top): within O1 zone (32.10-33.90Ma, top in Rupelian stage). Data source: Spezzaferri et al 2018;
First occurrence (base): within E1 zone (55.81-55.96Ma, base in Ypresian stage). Data source: Eocene Atlas

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globoturborotalita

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.225; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 117;

References:

Berggren, W. A., Olsson, R. K. & Premoli Silva, I. (2006a). Taxonomy, biostratigraphy and phylogenetic affinities of Eocene Astrorotalia, Igorina, Planorotalites, and Problematica (Praemurica? lozanoi). 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 12): 377-400. gs

Kelly, D. C., Bralower, T. J., Zachos, J. C. & Premoli Silva, I. T. , E. (1996). Rapid diversification of planktonic foramiifer in the tropical Pacific (ODP Site 865) during the late Paleocene thermal maximum. Geology. 24: 423-426. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

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

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

Globoturborotalita bassriverensis compiled by the pforams@mikrotax project team viewed: 16-10-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=100142 Go to Archive.is to create a permanent copy of this page - citation notes

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Concavo-convex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Moderate	periphery:	N/A	aperture border:	Thick lip
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	N.B. These characters are used for advanced search. N/A - not applicable