pforams@mikrotax - Turborotalita clarkei pforams@mikrotax - Turborotalita clarkei

Turborotalita clarkei


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

Taxonomy

Citation: Turborotalita clarkei (Rögl & Bolli, 1973)
taxonomic rank: species
Basionym: Globigerina clarkei
Synonyms:
Taxonomic discussion: Although rarely recorded, T. clarkei likely represents the smallest as well as numerically most abundant of all modern species (Boltovskoy, 1991; Pearson et al., 2018; Chernikhovsky et al., 2020). Like T. humilis, T. clarkei is known in a lightly calcified lobate form commonly encountered in the living plankton as well as a heavily calcified compact (terminal) form often found in the sediment. The species was recognized by Saito et al. (1981) but assigned to Berggrenia. In Schiebel and Hemleben (2017), specimens of T. clarkei on plate 2.13, figs. 14– 15 and plate 2.16, figs. 13–17 are labelled as T. quinqueloba. [Brummer & Kucera 2022]

Catalog entries: Globigerina clarkei

Type images:

Distinguishing features:
Parent taxon (Turborotalita): Minute, with bullate extension of the final chamber, smooth wall, large pores and short conical spines concentrated along the periphery.
This taxon: Five chambers & small, compact outline

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


Wall type:
Spinose; Cancellate [Aze 2011]

Size:
<150µm

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin flange
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:5-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Low latitudes [Aze et al. 2011, based on Brummer & Kroon (1988)]

In modern oceans an abundant, temperate water, species [SCOR WG138]


Isotope paleobiology
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts; based on comparison with other species of the genus.

Most likely ancestor: Turborotalita cristata - at confidence level 3 (out of 5). Data source: Aze et al. 2011.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (SCOR WG138)
First occurrence (base): within PT1a subzone (0.61-1.88Ma, base in Gelasian stage). Data source: Aze et al. 2011

Plot of occurrence data:

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Brönnimann, P. & Resig, J. (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Initial Reports of the Deep Sea Drilling Project. 7(2): 1235-1469. gs O

Brummer, G. J. A. & Kroon, D. (1988). Planktonic foraminifers as tracers of ocean-climate history. Free University Press, Amsterdam. 1-346. gs

Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs

Rögl, F. & Bolli, H. M. (1973). Holocene to Pleistocene planktonik foraminifera of LEG 15, site 147 (Cariaco Basin (Trench), Caribbean Sea) and their climatic interpretation. Initial Reports of the Deep Sea Drilling Project. 15: 553-579. gs O

Saito, T., Thompson, P. R. & Breger, D. (1981). Systematic Index of Recent and Pleistocene Planktonic Foraminifera. University of Tokyo Press, Tokyo. 1-190. gs

Schiebel, R. & Hemleben, C. (2017). Planktic Foraminifers in the Modern Ocean. Springer-Verlag, Heidelberg. 1-358. gs

Missing or ambiguous references: Boltovskoy 1991; Chernikhovsky et al. 2020; Pearson et al. 2018;


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Turborotalita clarkei compiled by the pforams@mikrotax project team viewed: 21-4-2024

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