Orbulinoides beckmanni

Classification: pf_cenozoic -> Globigerinidae -> Orbulinoides -> Orbulinoides beckmanni
Sister taxa: O. beckmanni, O. sp.,


Citation: Orbulinoides beckmanni (Saito 1962)
Rank: Species
Basionym: Porticulasphaera beckmanni
Taxonomic discussion: The holotype chosen by Saito (1962), here refigured in Pl. 7.10, Figs. 1-3, falls within the variability of O. beckmanni as the last chamber possesses numerous supplementary apertures at its base; however, the enveloping degree of the early chambers of the outer whorl by the last chamber is moderate, resulting in a less compact shape instead of a spherical shape as in specimens illustrated in Pl. 7.11, Figs. 4-16; in addition, the sutural supplementary apertures are poorly visible in the early chambers. While the presence of areal supplementary apertures is further confirmed (see Pl. 7.11, Fig. 15), we do not have any evidence that the sutural supplementary apertures open into vestibules as described by Cordey (1968) and Proto Decima and Bolli (1970).
The specimens illustrated by Blow (1979) as Globigerapsis beckmanni in pl. 192, figs. 6-9 do not represent the beckmanni stage, because they lack multiple sutural supplementary apertures even at the base of the last chamber (see Blow, 1979, p. 1138) and in our opinion they fall within the variability of G. euganea. [Premoli Silva et al. 2006]

Catalog entries: Porticulasphaera beckmanni

Type images:

Distinguishing features: Test spherical with numerous small secondary apertures.

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.


Wall type: Spinose, cancellate. [Premoli Silva et al. 2006]

Size: Dimensions: 0.50-0.60 mm. [Premoli Silva et al. 2006]

Character matrix

test outline:Circularchamber arrangement:Envelopingedge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:Sutural
spiral sutures:Moderately depressedumb depth:N/Awall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:1.0-1.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: [Premoli Silva et al. 2006]
Aze et al. 2011 summary: Low latitudes; based on Premoli Silva et al. (2006)

Isotope paleobiology: No data available. [Premoli Silva 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: Proto Decima and Bolli (1970) indicated that Orbulinoides beckmanni is the end member of the lineage curryi -euganea -beckmanni. [Premoli Silva et al. 2006]

Most likely ancestor: Globigerinatheka euganea - at confidence level 4 (out of 5). Data source: Premoli Silva et al. 2006 f7.1.

Biostratigraphic distribution

Geological Range:
Notes: Orbulinoides beckmanni has a restricted stratigraphic range, confined to the middle Eocene Zone E12 (P13) (Orbulinoides beckmanni Zone). [Premoli Silva et al. 2006]
The LAD of Orbulinoides beckmanni marks the base of zone E13 / top of E12 (Wade et al. 2011)
The FAD of Orbulinoides beckmanni marks the base of zone E12 / top of E11 (Wade et al. 2011)
Last occurrence (top): at top of E12 zone (100% up, 40Ma, in Bartonian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): at base of E12 zone (0% up, 40.4Ma, in Bartonian stage). Data source: zonal marker (Wade et al. 2011)

Plot of occurrence data:

Primary source for this page: Premoli Silva et al. 2006 - Eocene Atlas, chap. 7, p. 207


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Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. 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: 3-50. gs V O

Cordey, W. G. (1968b). Morphology and phylogeny of Orbulinoides beckmannii (Saito 1962). Palaeontology. 11(3): 371-375. gs V O

Cushman, J. A. (1925d). New foraminifera from the Upper Eocene of Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research. 1(1): 4-9. 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

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Premoli Silva, I., Wade, B. S. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Globigerinatheka and Orbulinoides. 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 7): 169-212. gs V O

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Saito, T. (1962a). Eocene planktonic foraminifera from Hahajima (Hillsborough Island). Transactions and Proceedings of the Palaeontological Society of Japan, New Series. 45: 209-225. gs V O

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Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs

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Orbulinoides beckmanni compiled by the pforams@mikrotax project team viewed: 20-10-2020

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