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.

Eocene_Atlas_pl09-5_fig4-8.jpg

Taxonomy

Citation: Acarinina punctocarinata Fleisher 1974

Rank: Species

Basionym: Acarinina punctocarinata

Synonyms:

Globorotalia crassaformis Galloway and Wissler.— Subbotina, 1953:223 (partim), pl. 21: figs. 5a-c [lower part of Zone of acarininids, Foraminiferal Beds, Green Group, Kuban River, North Caucasus]. [Not Galloway and Wissler, 1927.]
Acarinina punctocarinata Fleisher, 1974:1014, pl. 3: figs. 4-6 (holotype), 7, 8 [Zone P11, DSDP Site 220, Arabian Sea].

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:

holotype: A. punctocarinata
holotype: A. punctocarinata
paratypes: A. punctocarinata

Distinguishing features: 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

Wall type: Strongly muricate, normal perforate, nonspinose. [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]

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

Character matrix

test outline:	Subquadrate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Subtriangular	umbilicus:	Wide	periph margin shape:	Subangular	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Coarsely muricate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.0-5.0	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 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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Acarinina

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). 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. gs V O

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. gs

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

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

Acarinina punctocarinata compiled by the pforams@mikrotax project team viewed: 23-1-2021

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