pforams@mikrotax - Acarinina punctocarinata pforams@mikrotax - Acarinina punctocarinata

Acarinina punctocarinata


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

Taxonomy

Citation: Acarinina punctocarinata Fleisher 1974
Taxonomic rank: species
Basionym: Acarinina punctocarinata
Synonyms:
Taxonomic discussion: Lower middle Eocene strata are characterized by a robust acarininid with distinctly wedge-shaped chambers and a peripheral concentration of thick, blunt muricae. Fleisher (1974) denominated this morphotype Acarinina punctocarinata. [Berggren et al. 2006]

Catalog entries: Acarinina punctocarinata

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: Like A. boudreauxi but larger and with distinct punctate pseudocarina formed by peripheral concentration of blunt, thick muricae.

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:

This taxon is distinguished from bullbrooki in the tangential elongation of its chambers (giving the test a semi- rectangular vs. (sub)quadrate shape), development of wedge-shaped chambers on the umbilical side, generally more angulo-conical umbilical profile and distinct punctate pseudocarina formed by peripheral concentration of blunt, thick muricae. [Berggren et al. 2006]

Morphology:
Low-trochospiral, 4 inflated, wedge-shaped chambers in last whorl, distinctly longer axially than radially broad; umbilicus open, deep, and generally relatively wide; aperture a low arch bordered by distinct lip extending towards, but not reaching, the peripheral margin; short, blunt muricae concentrated on umbilical shoulders but no circumumbilical muricate rim; sutures radial to slightly curved, distinctly incised; spiral side with radial to slightly curved sutures; distinctly punctate pseudocarina formed by peripheral concentration of muricae; in edge view periphery is subacute with distinctly punctate pseudocarina. [Berggren et al. 2006]

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

Size:
Maximum diameter of holotype 0.33mm, thickness 0.24 mm. [Berggren et al. 2006]

Character matrix
test outline:Subquadratechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Cosmopolitan distribution (from tropical to austral regions). [Berggren et al. 2006]
Aze et al. 2011 summary: Cosmopolitan; based on Berggren et al. (2006b)

Isotope paleobiology
[Berggren et al. 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts; based on comparison with other species of the genus.

Phylogenetic relations
Evolved from A. boudreauxi (see also Blow, 1979, p. 936-937). [Berggren et al. 2006]

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

Biostratigraphic distribution

Geological Range:
Notes: Zone E7 (upper part) to Zone E11 [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 upper part of E7a subzone (80% up, 48.7Ma, 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. 308

References:

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006). 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. 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 O

Blow, W. H. (1979). 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. E. J. Brill, Leiden. 2: 1-1413. gs

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

Galloway, J. J. & Wissler, S. G. (1927). Galloway, J. J. & Wissler, S. G. (1927). Pleistocene foraminifera from the Lomita Quarry, Palos Verdes Hills, California. Journal of Paleontology. 1(1): 35-87. Journal of Paleontology. 1(1): 35-87. gs

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Acarinina punctocarinata compiled by the pforams@mikrotax project team viewed: 15-5-2025

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