pforams@mikrotax - Acarinina topilensis

Acarinina topilensis

Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina topilensis
Sister taxa: << < 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, A. esnaensis, A. primitiva, A. coalingensis, A. nitida, A. strabocella, A. sp.


Citation: Acarinina topilensis (Cushman 1925)
Rank: Species
Basionym: Globigerina topilensis

Taxonomic discussion:
Originally described from the middle Eocene of Mexico, this taxon has since been shown to have an essentially global (sub)tropical distribution. With its distinctly angulo-conical test, disjunct (ante)penultimate chamber margins, wedge/cuneate shaped and strongly muricate terminal chamber(s), “supplementary” apertures along spiral sutural margins and relatively short stratigraphic range, it is one of the most distinctive middle Eocene taxa.
The main question regarding this taxon is its ancestry which bears in turn upon the limits of variability and stratigraphic range of possible ancestral morphotypes. Blow (1979, p. 1043-1045) created the taxon G. (T.) topilensis praetopilensis (said to have evolved from Acarinina pseudotopilensis) and viewed it as directly ancestral to topilensis. Differentiation was made primarily on the basis of the more involute coiling pattern, smaller umbilicus, less well developed murical ornament along the peripheral margin of the later chambers, and less well developed/pronounced chamber separation in the (ante)penultimate chambers.
Pearson (1990) and Pearson and others (1993, p. 124) viewed the evolution of this taxon in a similar fashion except that pseudotopilensis, rather than Blow’s praetopilensis, was viewed as the direct ancestor of topilensis. Reference to Pearson and others (1993, pl. 1, figs. 13-15) shows that their concept of pseudotopilensis is closer to Blow’s (1979, pl. 178, figs. 6-9; pl. 169, figs. 1-7, 9, and, in particular, 8 [=holotype] praetopilensis and/or Acarinina mcgowrani n. sp., are distinctly different from Subbotina’s (1953, pl. 21, figs. 8a-c [=holotype], 9a-c; pl. 22, figs. 1a-2c) pseudotopilensis from the Zone of conical globorotaliids (=Zones P6b-8 of Berggren and others, 1995). Pearson (1990) made the observation that the strongly anguloconical (truncorotaloid) character of the last chamber arises only in fully adult specimens (being absent in smaller size fractions) so that when the last chamber is lost or broken this taxon is indistingushable from “pseudotopilensis”. (We would agree except that we believe it is with praetopilensis that differentiation should be made.) The taxon pseudotopilensis has its FAD in Zone E1 and does not range into stratigraphic levels as high as Zones P11-
12 (=E9-11) from which “pseudotopilensis” of Pearson and others (1993) was illustrated. [Berggren et al. 2006]

Catalog entries: Globigerina topilensis, Truncorotaloides libyaensis

Type images:

Distinguishing features:
Parent taxon (Acarinina): Moderate to low trochospire; chambers ovoid, usually 4-6 in final whorl.
Wall muricate with pustules on umbilical shoulders;

This taxon: Chambers distinctly inflated, anguloconical; last 1 or 2 chambers strongly compressed, angulate and disjunct; rimmed by thick, blunt circum-cameral muricocarinae; sutural supplementary apertures on spiral side.

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: Strongly muricate, nonspinose, normal perforate. [Berggren et al. 2006]

Morphology: Subquadrate, lobulate peripheral outline; 3½ - 4½ chambers on umbilical side, increasing rapidly in size, laterally angulate, ante-and penultimate chamber(s) strongly flattened along peripheral margin giving distinctly cuneate or mitriform shape; sutures strongly incised, radial and straight to weakly curved depending on degree of compression of adjacent chambers resulting in disjunct/incised chamber separation; umbilicus narrow, deep; aperture a raised, umbilical-extraumbilical arch bordered by a thin lip; approximately 10 chambers in 2 - 2½ whorls on spiral side; chambers radially elongate, lunate/semicircular, last chamber often wedge shaped/cuneate; sutures curved, depressed; peripheral margin marked by concentration of (on some individuals large, blunt) muricae; supplementary apertures, bordered by raised rims, visible along spiral suture margin(s); planoconvex in edge view; early chambers of last whorl subrounded to subacute, (pen)ultimate chambers strongly anguloconical. [Berggren et al. 2006]

Size: Maximum diameter of holotype 0.34 mm, thickness 0.24 mm. [Berggren et al. 2006]

Character matrix
test outline:Subquadratechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Sutural
spiral sutures:Strongly depressedumb depth:Deepwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Widely distributed in the Caribbean, North and South Atlantic, Indo-Pacific and Tethyan/Mediterranean regions; rare in North Caucasus sections. [Berggren et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Berggren et al. (2006b)

Isotope paleobiology: Oxygen and carbon isotope evidence suggests a mixed layer habitat (Pearson and others, 2001). Boron isotope data (Pearson and Palmer, 1999) supports this interpretation. [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): Pearson et al. (1993, 2001a)

Phylogenetic relations: Evolved from Acarinina praetopilensis in E10 and gave rise to A. rohri. [Berggren et al. 2006]

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

Biostratigraphic distribution

Geological Range:
Notes: Zone E10 to mid Zone E12. [Berggren et al. 2006]
Last occurrence (top): within E11 zone (40.40-41.89Ma, top in Bartonian stage). Data source: Eocene Atlas
First occurrence (base): in lower part of E10 zone (20% up, 43Ma, in Lutetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 319


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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

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Acarinina topilensis compiled by the pforams@mikrotax project team viewed: 21-9-2021

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