Eocene_Atlas_pl09-5_fig4-8.jpg
Eocene_Atlas_pl09-5_fig4-8.jpgCatalog entries: Acarinina punctocarinata
Type images:
holotype: Acarinina punctocarinata
holotype: Acarinina punctocarinata
paratypes: Acarinina punctocarinataDistinguishing 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.
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: | 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 | |||
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.
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
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 :: :: 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 :: :: 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 :: :: References:
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Acarinina punctocarinata compiled by the pforams@mikrotax project team viewed: 2-6-2020
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