Beella praedigitata

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Beella -> Beella praedigitata
Sister taxa: B. digitata, B. megastoma, B. praedigitata, B. sp.,

Taxonomy

Citation: Beella praedigitata (Parker, 1967)
Rank: species
Basionym: Globigerina praedigitata Parker, 1967

Catalog entries: Globigerina praedigitata;

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.

Description


Diagnostic characters: Low to medium trochospiral, lobulate periphery

Aperture: : Interiomarginal umbilical semicircular arch bordered by a pronounced lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Smooth [Aze 2011]

Test morphology: Test low to medium trochospiral, equatorial periphery strongly lobulate; cham- bers inflated, initially spherical , later becoming ovate, 4 to 5, rapidly increasing chambers in the final whorl; sutures distinct, depressed; surface smooth with circular to subcircular pores and discrete tubercles rep- resenting spine bases (PI. 58; Fig. 2). Aperture interiomarginal, umbilical , a semicircular arch bordered by a pronounced lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical to temperate.

Isotope paleobiology: Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on comparison with other species of the genus

Phylogenetic relations: B. praedigitata evolved from Globigerina (Gg.) bulloides in the Late Miocene. [Kennett & Srinivasan 1983]

Similar species: B. praedigitata differs from its descendant B. digitata by lacking fully developed radially elongate chambers. [Kennett & Srinivasan 1983]

Most likely ancestor: Globigerina bulloides - at confidence level 2 (out of 5). Data source: Kennett & Srinivasan 1983, fig.26; Chaisson & Pearson 1997 p.29 [but Aze et al. 2012 assign Globigerinella siphonifera].

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within PT1b subzone (0.00-0.61Ma, top in "Holocene" stage). Data source: Chaisson & Pearson (1997)
First occurrence (base): within N17a zone (6.60-8.58Ma, base in Tortonian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.232

References:

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.

Chaisson, W.P. & Pearson, P.N.P., (1997). Planktonic foraminifer biostratigraphy at Site 925: Middle Miocene–Pleistocene. Proceedings of the Ocean Drilling Program, Scientific Results,, 154: 3-31.

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

Parker, F.L., (1967). Late Tertiary biostratigraphy (planktonic foraminifera) of tropical Indo-Pacific deep-sea cores. Bulletins of American Paleontology, 52(235): 115203.


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Beella praedigitata compiled by the pforams@mikrotax project team viewed: 23-11-2017

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