Acarinina punctocarinata


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Acarinina -> Acarinina punctocarinata
Sister taxa: << < A. pentacamerata, A. aspensis, A. echinata, A. pseudosubsphaerica, A. alticonica, A. soldadoensis, A. interposita, 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. pseudotopilensis, A. quetra, A. wilcoxensis, A. esnaensis, A. primitiva, A. coalingensis, A. nitida, A. strabocella, A. sp.,

Taxonomy

Citation: Acarinina punctocarinata Fleisher 1974
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:

Short diagnosis: 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.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

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]

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

Test 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]

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

Character matrix

test outline:Subquadratechamber arrangement:Trochospiraledge view:Planoconvexaperture:
umb chamber shape:Subtriangularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
sp chbr shape:Reniformumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Moderately depresseddiameter mm:0.33width mm:breadth mm:0.24
final-whorl chambers:4.0-5.0

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 very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study

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 - Atlas of Eocene Planktonic Foraminifera, chapter 9, p. 308

References:

Berggren, W.A.; Pearson, P.N.; Huber, B.T. & Wade, B.S., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 257-326.

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, 1413 pp.

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.

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


logo

Acarinina punctocarinata compiled by the pforams@mikrotax project team viewed: 17-12-2017

Taxon Search:
Advanced Search

Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics