Acarinina primitiva

Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina primitiva
Sister taxa: << < 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 primitiva (Finlay 1947)
Rank: Species
Basionym: Globoquadrina primitiva
Taxonomic discussion: The outward, superficial morphologic similarity of the type species primitiva to that of the Neogene globoquadrinid form Globoquadrina dehiscens led Jenkins (1965b) to create the generic name Pseudogloboquadrina for Eocene morphotypes, but the morphology is similar to other Paleogene acarininids and this name is unnecessary (see also Blow, 1979, p. 950).
Acarinina primitiva is the dominant acarininid in middle Eocene austral assemblages and its disappearance/extinction in the late middle Eocene (?Chron C18n) is a useful datum level for regional correlation. See discussion in Berggren and Norris (1997, p. 69), Olsson and others (1999, p. 437) and above for A. coalingensis for further relevant data. [Berggren et al. 2006]

Catalog entries: Globoquadrina primitiva

Type images:

Distinguishing features: Like A. coalingensis but with triangular (broadly wedge-shaped) chambers and straight, incised, sutures on the umbilical 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: Coarsely muricate, often with relatively smooth umbilical face to final chamber, normal perforate, nonspinose. [Berggren et al. 2006]

Morphology: Robust, compact, subquadrate, strongly and bluntly muricate test; 3-4 triangular-shaped chambers in last whorl); chambers arranged at distinct right angles to each other and usually separated by distinct and incised sutures (particularly between preantepenultimate and antepenultimate chambers) on the umbilical side; umbilicus narrow, deep; aperture asymmetrically placed at base of last chamber, interiomarginal, umbilical-extraumbilical; high, smooth or beaded (but not muricate) face to final chamber above aperture, chambers on spiral side tangentially longer than broad; sutures curved, generally obscured by muricate ornament; peripheral margin subangular in edge view; [Berggren et al. 2006]

Size: Maximum diameter of holotype 0.29mm, thickness 0.26 mm. [Berggren et al. 2006]

Character matrix

test outline:Subquadratechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:Muricocarinateaperture border:N/A
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Essentially temperate-high latitude (austral; South Indian Ocean and Subantarctic Ocean distribution; less commonly reported in low latitudes (Caribbean, Atlantic, Indo-Pacific). [Berggren et al. 2006]
Aze et al. 2011 summary: Middle to high latitudes, less commonly in low 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 form descended from Acarinina coalingensis in the early Eocene by means of developing a more subquadrate test and concomitant sutural incision and chamber separation in the final whorl. [Berggren et al. 2006]

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

Biostratigraphic distribution

Geological Range:
Notes: Zone E6 to Zone E13. Berggren and others (2000) recorded the lowest/earliest occurrence of A. primitiva in association with the lowest/ earliest A. coalingensis in Zone P4c and Chron C25r and C25n at DSDP Site 384 in the northwest Atlantic Ocean (see also compilation in Berggren and others, 1995, p. 155); we now regard these records as referable to A. coalingensis. The last occurrence datum has been fixed by Huber (1991) to lower Zone AP11 at Sites 738 Kerguelen Plateau, by Stott and Kennett (1990) to a level in mid-Chron C18n at ODP Site 689 on Maud Rise and by Berggren (1992) to a level within/slightly above questionable Chron 18n at Site 748, Kerguelen Plateau, which is approximately equivalent to Zone E13 in the (sub)tropics. [Berggren et al. 2006]
Last occurrence (top): within E13 zone (37.99-39.97Ma, top in Bartonian stage). Data source: Eocene Atlas
First occurrence (base): within E6 zone (50.20-50.67Ma, base in Ypresian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 302


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Acarinina primitiva compiled by the pforams@mikrotax project team viewed: 16-1-2021

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