Acarinina angulosa

Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina angulosa
Sister taxa: A. medizzai, A. collactea, A. pentacamerata, A. aspensis, A. interposita, A. echinata, A. pseudosubsphaerica, A. alticonica, A. soldadoensis, A. cuneicamerata, A. angulosa, A. africana, A. sibaiyaensis, A. esnehensis, A. mckannai, A. subsphaerica ⟩⟨ A. bullbrooki, A. punctocarinata, A. boudreauxi, A. rohri, A. topilensis, A. praetopilensis, A. mcgowrani, A. quetra, A. pseudotopilensis, A. wilcoxensis> >>


Citation: Acarinina angulosa (Bolli 1957)
Rank: Species
Basionym: Globigerina soldadoensis angulosa
Taxonomic discussion: This distinctive taxon is a common component of lower Eocene (sub)tropical assemblages where it is associated with other acarininids (soldadoensis, interposita, pentacamerata, pseudotopilensis) and morozovellids (subbotinae, formosa, gracilis, aragonensis). In the course of our studies in Egypt we have found that this taxon has its FAD just below the base of the CIE / PETM interval, i.e., within the uppermost part of Zone P5 (as redefined in Berggren and Pearson, 2005). [Berggren et al. 2006]

Catalog entries: Globigerina soldadoensis angulosa

Type images:

Distinguishing features: Last whorl with strongly angular disposition of the chambers; outline strongly lobulate.

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.


Wall type: Muricate, normal perforate, nonspinose. [Berggren et al. 2006]

Morphology: Low trochospiral test with lobulate peripheral outline; about 10-12 chambers in 2½ whorls; 4½-5 subangular chambers in last whorl gradually increasing in size, separated by straight, radial and depressed sutures; spiral side flat to slightly convex, sutures curved/oblique; umbilicus moderately wide, open, deep; aperture a low interiomarginal-umbilical arch extending nearly to the periphery; axial/edge view subangular. [Berggren et al. 2006]

Size: Maximum diameter of holotype 0.40mm, thickness 0.28 mm. [Berggren et al. 2006]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Moderately muricateshell 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: Ranges from tropical to temperate regions; Arabian Sea, north Pacific Ocean (DSDP Site 47), New Jersey Coastal Plain (Bass River), Tethyan deposits of northern Africa (Egypt) and occurrences in Spain (Alicante Province) and New Guinea. [Berggren et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Berggren et al. (2006b)

Isotope paleobiology: No data available. [Berggren et al. 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations: This species evolved from Acarinina soldadoensis in uppermost Zone P5 and probably gave rise to A. cuneicamerata. [Berggren et al. 2006]

Most likely ancestor: Acarinina soldadoensis - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Likely descendants: Acarinina cuneicamerata;

Biostratigraphic distribution

Geological Range:
Notes: Zone P5 (uppermost part) to Zone E7. Note that the Paleocene part of the range was not recorded by Olsson and others (1999). [Berggren et al. 2006]
Last occurrence (top): within E7 zone (45.72-50.20Ma, top in Lutetian stage). Data source: Eocene Atlas
First occurrence (base): in mid part of P5 zone (50% up, 56.5Ma, in Thanetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 263


Belford, D. J. (1984). Tertiary foraminifera and age of sediments, Ok Tedi-Wabag, Papua New Guinea. Australia Bureau of Mineral Resources, Geology and Geophysics Bulletin. 216: 1-52. gs

Berggren, W. A. & Pearson, P. N. (2005). A revised tropical to subtropical Paleogene planktonic foraminiferal zonation. Journal of Foraminiferal Research. -. gs

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. 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 9): 257-326. gs V O

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. (1957a). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. 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: 155-172. gs V O

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. 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: 61-82. gs V O

Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs V O

Hillebrandt, A. , von (1976). Los foraminiferos planctonicos, nummulitidos y coccolitoforidos de la zona de Globorotalia palmerae del Cuisiense (Eoceno inferior) en el SE de Espana, (Provincias de Murcia y Alicante. Revista Española de Micropaleontología. 8(3): 323-394. gs

Samuel, O., Borza, K. & Kohler, E. (1972). Microfauna and lithostratigraphy of the Paleogene and adjacent Cretaceous of the Middle Vah Valley (West Carpathian). Geologicky Ustav Dionyza Stura, Bratislava. 1-264. gs

Soldan, D. M., Petrizzo, M. R. & Silva, I. P. (2014). Pearsonites, a new Paleogene planktonic foraminiferal genus for the broedermanni lineage. Journal of Foraminiferal Research. 44: 17-27. gs


Acarinina angulosa compiled by the pforams@mikrotax project team viewed: 11-4-2021

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