Ciperoella angulisuturalis


Classification: pf_cenozoic -> Globigerinidae -> Ciperoella -> Ciperoella angulisuturalis
Sister taxa: C. anguliofficinalis, C. angulisuturalis, C. ciperoensis, C. fariasi, C. sp.,

Taxonomy

Citation: Ciperoella angulisuturalis (Bolli, 1957)
Rank: species
Basionym: Globigerina ciperoensis angulisuturalis Bolli, 1957
Synonyms:
Taxonomic discussion:

This is an easily identified species and its first occurrence is a marker for the lower Oligocene Zone O4 (Wade and others, 2011). We note that C. angulisuturalis is missing from published species lists for the boreal North Sea (Hooybergh and De Meuter, 1972; Hooyberghs and others, 1992), whereas the ancestor C. anguliofficinalis and descendant C. ciperoensis respectively are recorded and illustrated (Rögl, 1969). This suggests that C. angulisuturalis has a more tropical affinity than other members of the genus and may explain the observed diachroneity of the last occurrence (see below). Blow (1969) regarded extreme versions with overly deepened sutures (Blow, 1969; pl. 11, fig. 9; pl. 12, figs. 1 and 2) from Zone N3/P22 (= O6/O7) Sicily as “phylogenetically advanced”. [Olsson et al. 2018]

Catalog entries: Globigerina ciperoensis angulisuturalis

Type images:

Distinguishing features: Like C. ciperoensis but smaller,; chambers squared off / wedge-shaped; sutures distinctly depressed; large umbilical aperture.

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:

The species is distinguished from C. ciperoensis and C. anguliofficinalis by its smaller lobulate test, squared off / wedge shaped chambers, distinctly depressed sutures forming steep U-shaped walls between chambers and large umbilical aperture. [Olsson et al. 2018]


Wall type: Normal perforate, spinose, Neogloboquadrina-type wall. Pore concentrations range from around 25-60 pores/50 μm2 test surface area and pore diameters from around 0.9-2.5 μm.

Test morphology: Moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 5 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, chambers squared off at sutures, sutures distinctly depressed, straight; in umbilical view 5 globular, slightly embracing chambers, increasing moderately in size, chambers squared off at sutures, sutures distinctly depressed forming steep U-shaped walls between chambers, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by a thin rim; in edge view chambers globular, slightly embracing, initial whorl of chambers slightly elevated. [Olsson et al. 2018]

Size: Maximum diameter of holotype 0.18 mm, minimum diameter 0.16 mm, thickness 0.11 mm. [Olsson et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
sp chamber shape:Trapezoidalcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.5-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Widespread in low to mid-latitudes. Rare or absent in high productivity areas. [Olsson et al. 2018]

Isotope paleobiology: Poore and Matthews (1984) and Shackleton and others (1984) record C. angulisuturalis as having isotopic ratios indicative of shallow, mixed-layer habitat. [Olsson et al. 2018]

Phylogenetic relations: Evolved from Ciperoella anguliofficinalis in the lower Oligocene. See the Ciperoella genus introduction for a summary on previous views on the evolutionary pathway. It did not leave any descendants. [Olsson et al. 2018]

Most likely ancestor: Ciperoella anguliofficinalis - at confidence level 4 (out of 5). Data source: .

Biostratigraphic distribution

Geological Range:
Notes: Zone O4 to M2. The FAD of C. angulisuturalis defines the base of Zone O4 (29.4 Ma), and the LAD is within Zone M2 (21.6 Ma) (Berggren and others, 1995; Wade and others, 2011). An earlier LAD in Subzone M1b is recorded in the Indian Ocean and Caribbean by Spezzaferri (1994). Pearson and Chaisson (1997:40) remarked that the datum is difficult to place in the equatorial Atlantic Ocean because of “a combination of abundance fluctuations of “G.” angulisuturalis in the higher part of its range and its susceptibility to dissolution”. [Olsson et al. 2018]
Last occurrence (top): within M2 zone (19.30-21.12Ma, top in Burdigalian stage). Data source: Olsson et al. 2018
First occurrence (base): within O4 zone (28.09-29.18Ma, base in Rupelian stage). Data source: Olsson et al. 2018

Plot of occurrence data:

Primary source for this page: Olsson et al. 2018 - Olig Atlas chap.7 p.220

References:

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Berggren, W. A., Kent, D. V., Swisher, I. , C. C. & Aubry, M. -P. (1995b). A revised Cenozoic geochronology and chronostratigraphy. In, Berggren, W. A. , Kent, D. V. , Aubry, M. -P. & Hardenbol, J. (eds) Geochronology, Time Scales and Global Stratigraphic Correlations. SEPM (Society for Sedimentary Geology) Special Publication No. 54, 129-212. 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

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

Bolli, H. M. (1954). Note on Globigerina concinna Reuss 1850. Contributions from the Cushman Foundation for Foraminiferal Research. 5(1): 1-3. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 97-123. gs

Chaproniere, G. C. H. (1981). Late Oligocene to Early Miocene planktic Foraminiferida from Ashmore Reef no. 1 well, northwest Australia. Alcheringa. 5: 103-131. gs

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Cifelli, R. (1982). Early Occurrences and some Phylogenetic Implications of Spiny, Honeycomb Textured Planktonic Foraminifera. Journal of Foraminiferal Research. 12(2): 105-115. gs

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Ciperoella angulisuturalis compiled by the pforams@mikrotax project team viewed: 31-3-2020

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