Catalog entries: Acarinina boudreauxi
Type images:Distinguishing features: Test anguloconical, tightly coiled with 4½-5 compressed chambers in fine whorl; straight radial sutures on the umbilical side; no muricocarina.
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.
Wall type: Robust, heavily calcified, wall with blocky fused muricae. [Berggren et al. 2006]
Morphology: Subcircular planconvex test, coiled in a low trochospiral with 4½ to 5 chambers in the final whorl. Chambers radially compressed and appressed with flat or slightly depressed sutures on a flat spiral side. Aperture umbilical-extraumbilical, a low arch. Ventral sutures straight, radial and depressed converging on a narrow, deep umbilicus. Periphery subacute. [Berggren et al. 2006]
Size: Maximum diameter of holotype 0.28 mm; thickness 0.21 mm. [Berggren et al. 2006]
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Crescentic | coiling axis: | Low | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Subtriangular | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Weakly depressed | umb depth: | Deep | wall texture: | Coarsely muricate | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.5-5.0 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution: Probably widespread; currently known only from the Indian Ocean. [Berggren et al. 2006]
Aze et al. 2011 summary: Probably widespread currently only known from Indian Ocean; 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: Possibly evolved from Acarinina pseudotopilensis and was ancestral to A. punctocarinata and A. bullbrooki. [Berggren et al. 2006]
Most likely ancestor: Acarinina pseudotopilensis - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Likely descendants: Acarinina bullbrooki; Acarinina punctocarinata;
Geological Range:
Notes: Ranges from the lower Part of Zone E7 to within Zone E9. [Berggren et al. 2006]
Last occurrence (top): within E9 zone (43.23-43.85Ma, top in Lutetian stage). Data source: Eocene Atlas
First occurrence (base): in lower part of E7a subzone (20% up, 49.8Ma, 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. 266
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 OReferences:
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Acarinina boudreauxi compiled by the pforams@mikrotax project team viewed: 19-1-2021
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