Acarinina quetra


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Acarinina -> Acarinina quetra
Sister taxa: << < A. cuneicamerata, A. echinata, A. esnaensis, A. esnehensis, A. interposita, A. mcgowrani, A. mckannai, A. medizzai, A. nitida, A. pentacamerata, A. praetopilensis, A. primitiva, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quetra, A. rohri, A. sibaiyaensis, A. soldadoensis, A. strabocella, A. subsphaerica, A. topilensis, A. wilcoxensis,

Taxonomy

Citation: Acarinina quetra (Bolli 1957)
Rank: Species
Basionym: Globorotalia quetra
Synonyms:
Taxonomic discussion: Acarinina quetra is a distinctive form that with its cuneate chambers and peripheral concentration of muricae, bears a superficial
resemblance (in some instances) to the stratigraphically younger (middle Eocene) A. topilensis. [Berggren et al. 2006]

Catalog entries: Globorotalia quetra;

Type images:

Short diagnosis: This taxon is distinguished by its angular test whose chambers are loosely disposed sequentially to each other at ~ 90° and with a distinct, but discontinuous, peripheral muricocarina.

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 by its angular test whose chambers are loosely disposed sequentially to each other at ~ 90o and with a distinct, but discontinuous, peripheral muricocarina. [Berggren et al. 2006]

Wall type: Moderately to strongly muricate with concentration of muricae along peripheral margin of last whorl, nonspinose, normal perforate. [Berggren et al. 2006]

Test morphology: Low trochospiral; test subquadrate, planoconvex; peripheral margin lobulate; chambers on umbilical side moderately inflated, flattened on spiral side; 4 broadly subtriangular chambers visible in umbilical view; anterior and posterior margins of last chamber flattened resulting in disjunct geometry with bordering chambers and conical apex of last chamber; sutures depressed/incised, curved to sinuous, radial; umbilicus relatively wide, deep; aperture an umbilical-extraumbilical, arch extending towards (but not to) the peripheral margin; 10-12 chambers in 2½ to 3 whorls on spiral side; chambers loosely disposed, meeting almost at right angles, increasing gradually in size; final chamber sometimes reduced in size; chambers lens-shaped, tangentially longer than radially broad in general, overlapping; sutures curved; discrete intercameral openings visible on some individuals (depending on preservation); planoconvex in edge view, final chamber distinctly anguloconical with high conical angle; periphery distinctly, but discontinuously, muricocarinate [Berggren et al. 2006]

Size: Maximum diameter of holotype 0.50 mm, thickness 0.38 mm. [Berggren et al. 2006]

Character matrix

test outline:Subquadratecoiling axis:Very lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Coarsely muricateaperture:Umb.-extraumbilicalaperture border:N/Aaccessory apertures:N/A
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Broadly rounded
umb depth:Deepdiameter mm:0.5width mm:breadth mm:0.38
final-whorl chambers:4.0-4.0

Biogeography and Palaeobiology


Geographic distribution: Widely distributed in (sub)tropical regions (Caribbean, Atlantic, Indo-Pacific, Tethyan/Mediterranean regions, North Caucasus) [Berggren et al. 2006]
Aze et al. 2011 summary: 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: Descended from A. pseudotopilensis. [Berggren et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Zone E3 (upper part) to Zone E6. [Berggren et al. 2006]
Last occurrence (top): within E6 zone (50.20-50.67Ma, top in Ypresian stage). Data source: Eocene Atlas
First occurrence (base): within E3 zone (54.61-55.20Ma, base 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. 310

References:

Berggren, W.A., (1977). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In: Ramsay, A.T.S. (Editor), Oceanic Micropaleontology. Academic Press, London, pp. 205-300.

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.

Bolli, H.M., (1957). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 97-124.

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.

Hillebrandt, A., (1962). Das paleozan und seine Foraminiferenfauna im Becken von Reichehall und Salzburg. Abhandlungen Bayerische Akademie der Wissenschaften Mathematisch Naturwissenschaftliche Klasse, 108: 1-182.

Snyder, S.W. & Waters, V.J., (1985). Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur Region, Deep Sea Drilling Project Leg 80. Initial Reports of the Deep Sea Drilling Project, 80: 439-472.

Stainforth, R.M.; Lamb, J.L.; Luterbacher, H.; Beard, J.H. & Jeffords, R.M., (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. The University of Kansas Paleontological Contributions, 62: 1-425.

Warraich, M.Y. & Ogasawara, K., (2001). Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan. Science Reports of the Institute of Geosciences, University of Tsukuba, Section B = Geological Sciences, 22: 1-59.

Warraich, M.Y.; Ogasawara, K. & Nishi, H., (2000). Late Paleocene to early Eocene planktic foraminiferal blostratigraphy of the Dungan Formation, Sulaiman Range, central Pakistan. Paleontological Research, 4(4): 275-301, 18 figures, 3 appendices.


Acarinina quetra compiled by the pforams@mikrotax project team viewed: 23-5-2017

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