Beella megastoma

Classification: pf_neogene -> Globigerinidae -> Beella -> Beella megastoma
Sister taxa: B. digitata, B. megastoma, B. praedigitata, B. sp.,


Citation: Beella megastoma (Earland 1934)
Rank: species
Basionym: Globigerina megastoma
Taxonomic discussion: Kennett & Srinivasan (1983) considered this a junior synonym of G. bulloides, but it is separated by  Aze et al (2011)

Catalog entries: Globigerina megastoma;

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.


Diagnostic characters: Trochospiral becoming streptospiral, chambers rounded to digitate

Aperture: : Interiomarginal umbilical-extraumbilical wide open symmetrical arch bordered by a thin lip [Aze 2011, based on Holmes 1984]

Wall type: Spinose; Irregularly cancellate [Aze et al 2011]

Biogeography and Palaeobiology

Isotope paleobiology: Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light ∂13C and very heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Most likely ancestor: Beella digitata - at confidence level 2 (out of 5). Data source: Aze et al. 2011.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Not recognised by WG138 but recorded as extant by Aze et al. 2011
First occurrence (base): within PT1a subzone (0.61-1.88Ma, base in Gelasian stage). Data source: Aze et al. 2011

Plot of occurrence data:


Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Earland, A., (1934). Foraminifera. Part III. The Falklands sector of the Antarctic (excluding South Georgia). Discovery Reports, 10: 1-208.

Holmes, N.A., (1984). An emendation of the genera Beella Banner and Blow, 1960, and Turborotalita Blow and Banner, 1962; with notes on Orcadia Boltovskoy and Watanabe, 1982. Journal of Foraminiferal Research, 14(2): 101-110.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.


Beella megastoma compiled by the pforams@mikrotax project team viewed: 23-1-2018

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