Catalog entries: Acarinina pseudosubsphaerica
Type images:Distinguishing features: Like A. alticonica but higher-spired; chambers less closely appressed; and umbilicus broader.
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: Weakly muricate, cancellate on spiral side with large, bladed muricae on umbilical side, normal perforate, nonspinose.[Berggren et al. 2006]
Morphology: Compact subspherical test coiled in a high trochospire of about two whorls with circular, slightly lobate outline; 4-6 moderately inflated, radially compressed chambers in final whorl; dorsal sutures wide and depressed, between circular chambers; primary aperture slit-like or a low, broad arch, situated in a wide, open umbilicus, and often covered by a small, sparsely muricate final chamber.[Berggren et al. 2006]
Size: Maximum diameter of holotype 0.19 mm, thickness 0.16 mm.[Berggren et al. 2006]
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | Moderate-high | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Subtriangular | umbilicus: | Wide | periph margin shape: | Broadly rounded | 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: | Weakly depressed | final-whorl chambers: | 4.0-6.0 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution: Probably widely distributed in tropical and mid-latitude sites. [Berggren et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Berggren et al. (2006b)
Isotope paleobiology: Recorded (under the name Muricoglobigerina esnehensis) as a mixed layer dwelling species by Pearson and others, (1993). [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): Pearson et al. (1993)
Phylogenetic relations: Descended from A. alticonica. [Berggren et al. 2006]
Most likely ancestor: Acarinina alticonica - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Likely descendants: Acarinina echinata;
Geological Range:
Notes: Zone E7 to Zone E10 [Berggren et al. 2006]
Last occurrence (top): within E10 zone (41.89-43.23Ma, top in Lutetian stage). Data source: Eocene Atlas
First occurrence (base): within E7a subzone (48.31-50.20Ma, base 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. 303
Berggren, W. A. & Norris, R. D. (1997). Biostratigraphy, phylogeny and systematics of Paleocene trochospiral planktonic foraminifera. Micropaleontology. 43(supplement 1): 1-116. gs 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 Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 173-198. gs V O Lu, G. & Keller, G. (1995). Planktic foraminiferal faunal turnovers in the subtropical Pacific during the Late Paleocene to Early Eocene. Journal of Foraminiferal Research. 25: 97-116. gs Nakkady, S. E. (1950). A new foraminiferal fauna from the Esna shales and Upper Cretaceous chalk of Egypt. Journal of Paleontology. 24(6): 675-692. gs Pearson, P. N. & Berggren, W. A. (2006). Taxonomy, biostratigraphy, and phylogeny of Morozovelloides n. gen. 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 10): 327-342. gs V O Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1993). Stable isotope paleoecology of middle Eocene planktonic foraminifera and multi-species isotope stratigraphy, DSDP Site 523, South Atlantic. Journal of Foraminiferal Research. 23: 123-140. gsReferences:
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Acarinina pseudosubsphaerica compiled by the pforams@mikrotax project team viewed: 22-4-2021
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