Acarinina collactea

Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina collactea
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, > >>


Citation: Acarinina collactea (Finlay 1939)
Rank: Species
Basionym: Globorotalia collactea
Taxonomic discussion:

Berggren and others (2006) noted that this taxon is a particularly common form in mid-high latitude assemblages, but the extension of the range of Acarinina collactea into the upper Eocene was controversial. Acarinina collactea is the most common Oligocene acarininid. Here we extend the range of this taxon further to the upper Oligocene (Zone O7). Berggren and others (2006) restricted Acarinina collactea to exclusively dextrally coiled specimens (see their plate 9.8). We illustrate specimens with angular chambers and wide sutures that are consistent with Acarinina collactea although they are sinistrally coiled (Plate 13.1, Figs. 11-16). Jenkins (1965a) found 95% of specimens from the type locality to be dextrally coiled. [Wade & Kucenjak 2018]

This is one of the most distinct and ubiquitous components of middle Eocene planktonic foraminiferal assemblages. Distinguished by its small size and compact, densely muricate test with irregularly distributed minute “openings” on the spiral side, it is a familiar and particularly common form in mid-high latitude assemblages.  [Berggren et al. 2006]

This form has been thoroughly studied and documented by Jenkins (1965a) who re-examined Finlay’s original type material. Blow (1979, p. 920) noted that the suturally-located openings on the spiral side do not appear to be functional supplementary apertures and may owe their origin to the “stand off” effect of late stage calcification preventing smooth junction of adjacent chambers owing to the development of previously calcified muricae in the intervening space(s).
The form identified by Bolli (1957a) as Globorotalia spinuloinflata (Bandy) is a subangular variant of the generally more rounded collactea and included here in the synonomy of collactea. In the former Soviet Union collactea has been identified as Acarinina rotundimarginata Subbotina from the middle Eocene of the N. Caucasus. We specifically exclude from collactea the ovate, sinistrally coiled specimens identified by Bronnimann (1952) and Postuma (1971) from the lower Eocene (Zone P6b) of Trinidad. Acarinina collactea is generally subcircular in outline, dextrally coiled and restricted to stratigraphically younger levels. The possible extension of this taxon into upper Eocene levels in high latitudes remains controversial. [Berggren et al. 2006]

Catalog entries: Globorotalia collactea, Acarinina rotundimarginata

Type images:

Distinguishing features: Small (~0.25-0.30 mm), 5-chambered and compact (involute) test.

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.


Diagnostic characters:

Acarinina collactea is characterized by its compact test, subangular chambers that increase slowly in size, and wide, incised sutures. It differs from Acarinina medizzai and A. echinata by its lower trochospire, wedge shaped and more angular chambers. [Wade & Kucenjak 2018]

Wall type: Moderately to coarsely muricate, normal perforate, nonspinose. [Wade & Kucenjak 2018]

Test morphology: Chambers arranged in a low to moderate trochospiral, test compact, typically 4½ -5 chambers in the final whorl, slowly increasing in size; peripheral outline weakly lobate; chambers on the umbilical side wedge-shaped or triangular with blunt and blocky muricae; sutures distinct, straight, radial and wide; umbilicus narrow, deep; umbilical-extraumbilical aperture; weakly convex to flat; on spiral side 10-12 sub-circular chambers in three whorls; sutures weakly incised, curved; rounded to subangular peripheral margin in edge view (modified after Berggren and others, 2006). [Wade & Kucenjak 2018]

Size: Maximum diameter of holotype 0.18 mm, thickness 0.13 mm. [Wade & Kucenjak 2018]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Cosmopolitan distribution in the Eocene. Our Oligocene records are from the Adriatic Sea and western Indian Ocean. [Wade & Kucenjak 2018]

Isotope paleobiology: No data available. [Wade & Kucenjak 2018]
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: Berggren and others (2006) tentatively suggested that Acarinina collactea evolved from Acarinina pentacamerata. Acarinina collactea probably gave rise to A. medizzai. [Wade & Kucenjak 2018]

Similar species:

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

Biostratigraphic distribution

Geological Range:
Notes: Zone E7 (Berggren and others, 2006) to Zone O7 (this study), possibly ranges into the Miocene. [Wade & Kucenjak 2018]
Last occurrence (top): within O7 zone (22.96-25.21Ma, top in Aquitanian stage). Data source: Wade & Kucenjak 2018
First occurrence (base): within E7a subzone (48.31-50.20Ma, base in Ypresian stage). Data source: Berggren et al. 2006

Plot of occurrence data:

Primary source for this page: Wade & Kucenjak 2018 - Olig Atlas chap.13 p.395; Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 276


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Wade, B. S. & Hernitz Kucenjak, M. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Acarinina. 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(Chap 13): 393-402. gs V O


Acarinina collactea compiled by the pforams@mikrotax project team viewed: 29-9-2020

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