Globigerina druryi

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerina -> Globigerina druryi
Sister taxa: G. bulloides, G. bulloideus, G. druryi, G. falconensis, G. umbilicata,

Taxonomy

Citation: Globigerina druryi Akers, 1955
Rank: species
Basionym: Globigerina druryi
Synonyms:

Globigerina (Zeaglobigerina) druryi

Catalog entries: Globigerina druryi;

Type images:

Description


Diagnostic characters: Trochospiral, compact, sub-globular chambers
Aperture: Umbilical small low arch bordered by a distinct rim [Aze 2011, based on Kennett & Srinivasan 1983]

Wall type: Spinose; Hispid [Aze 2011]

Test morphology: Test small, compact, trochospiral, chambers subglobular, increasing uniformly in size as added, four in the final whorl; sutures radial, depressed; surface coarsely pitted; initial whorls indistinct due to the thickening of the test wall; aperture a small, low arch bordered by a distinct rim. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: A tropical to warm-subtropical species. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂13C and relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations:

The small, compact test, coarse- pitted surface, and small rimmed aperture serve to distinguish this species from others of the subgenus Zeaglobigerina. Gg. (Zg.) druryi evolved from Gg. (Zg.) woodi during the Early Miocene Zone N7 and developed into Gg. (Zg.) nepenthes by further elongation of the final chamber. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N15 zone (9.83-10.46Ma, top in Tortonian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N7 zone (16.38-17.54Ma, base in Burdigalian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.46

References:

Akers, W.H., (1955). Some planktonic foraminifera of the American Gulf Coast and suggested correlations with the Caribbean Tertiary. Journal of Paleontology, 29(4): 647-664.

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.

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


Globigerina druryi compiled by the pforams@mikrotax project team viewed: 29-5-2017

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