Turborotalita praequinqueloba


Classification: pf_cenozoic -> Globigerinidae -> Turborotalita -> Turborotalita praequinqueloba
Sister taxa: T. clarkei, T. cristata, T. humilis, T. quinqueloba, T. praequinqueloba, T. carcoselleensis, T. sp.,

Taxonomy

Citation: Turborotalita praequinqueloba Hemleben & Olsson, in Olsson et al 2006
Rank: Species
Basionym: Turborotalita praequinqueloba
Synonyms:
Taxonomic discussion:

This species has previously been identified only by Olsson and others (2006) from a single sample from Mississippi. Here we add occurrences from the Adriatic and Labrador Sea and extend the stratigraphic range into the Oligocene. [Pearson & Kucera 2018]

Catalog entries: Turborotalita praequinqueloba,

Type images:

Distinguishing features: Like T. carcoselleensis but more lobate and wall texture better developed.

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:

Turborotalita praequinqueloba is distinguished from T. quinqueloba by possessing 4-4½ chambers in the final whorl. It is more gracile than T. carcoselleensis, which has more inflated chambers and a thicker test. [Pearson & Kucera 2018]


Wall type: Normal perforate, spinose, may be covered by a crust in adult stage. [Pearson & Kucera 2018]

Test morphology: “Test very low trochospiral, lobulate in outline, chambers globular; in spiral view 4-4½ globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, ultimate chamber sometimes reduced in size, sutures moderately depressed, straight; in umbilical view 4-4½ globular, slightly embracing chambers, increasing moderately in size, ampullate ultimate chamber often reduced and directed towards and over the umbilicus, sutures moderately depressed, straight, umbilicus small and often covered by ultimate chamber, aperture umbilical, a wide arch bordered by an imperforate rim or narrow thickened lip; in edge view chambers globular in shape, slightly embracing” (Olsson and others, 2006:165). [Pearson & Kucera 2018]

Size: Maximum diameter of holotype: approximately 0.27 mm, thickness 0.13 mm (Olsson and others, 2006:165; note original scale bars are wrongly given as 100 µm instead of 40 µm on Olsson and others, 2006, pl. 6.20). [Pearson & Kucera 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
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: Probably global although so far only a few occurrences have been described. [Pearson & Kucera 2018]

Isotope paleobiology: No data available. [Pearson & Kucera 2018]

Phylogenetic relations: Probably evolved from T. quinqueloba by developing fewer chambers in the final whorl. [Pearson & Kucera 2018]

Most likely ancestor: Turborotalita quinqueloba - at confidence level 3 (out of 5). Data source: Pearson & Kucera 2018.

Biostratigraphic distribution

Geological Range:
Notes: Upper Eocene Zone E15/16 (Olsson and others, 2006) to upper Oligocene Zone O5 (this study). [Pearson & Kucera 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Pearson & Kucera 2018
First occurrence (base): within E15 zone (34.68-35.89Ma, base in Priabonian stage). Data source: Olsson et al 2006

Plot of occurrence data:

Primary source for this page: Pearson & Kucera 2018 - Olig Atlas chap.12 p.388; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 165

References:

Hemleben, C. & Olsson, R. K. (2006). Wall textures of Eocene planktonic foraminifera. 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: 47-66. 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: 111-168. gs

Pearson, P. N. & Kucera, M. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Turborotalita. 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: 385-393. gs


logo

Turborotalita praequinqueloba compiled by the pforams@mikrotax project team viewed: 22-7-2019

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=100322 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