Globigerinoides tenellus

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerinoides -> Globigerinoides tenellus
Sister taxa: G. altiaperturus, G. conglobatus, G. diminutus, G. elongatus, G. extremus, G. mitra, G. obliquus, G. parawoodi, G. ruber, G. seigliei, G. subquadratus, G. tenellus, G. white, G. sp.,

Taxonomy

Citation: Globigerinoides tenellus Parker, 1958
Rank: species
Basionym: Globigerinoides tenellus

Catalog entries: Globigerinoides tenellus;

Type images:

Short diagnosis: Four chambers & small

Description


Diagnostic characters: Small, low trochospiral, chambers spherical

Aperture: : Primary aperture umbilical large almost circular opening with distinct rim small supplementary aperture on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]

Coiling direction (in extant population): mixed


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test small, low trochospire , chambers spherical, four in the final whorl, rapidly increasing in size as added; sutures cllrved and depressed; surface distinctly cancellate with pores set in polygonal pore pits; primary aperture umbilical large, almost circular in outline, with a distinct rim; single small, supplementary aperture on spiral side at intersection of spiral and intercameral sutures. [Kennett & Srinivasan 1983]

Size: >250µm

Biogeography and Palaeobiology


Geographic distribution: Tropical to temperate. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on ∂13C lighter than species with symbionts; also with relatively light ∂18O Cited sources (Aze et al. 2011 appendix S3): this study

Phylogenetic relations: Gs. tenellus is similar to Globigerina (Zeaglobigerina) rubescens in all respects except for the development of a small, supplementary aperture. This species evolved from Gg. (Zg.) rubescens in the Late Pliocene. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N21 zone (1.93-3.10Ma, base in Piacenzian stage). Data source: Chaisson & Pearson (1997)

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.80

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.

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

Parker, F.L., (1958). Eastern Mediterranean foraminifera. Reports of the Swedish Deep-Sea Expedition, 8(4): 217-283.


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Globigerinoides tenellus compiled by the pforams@mikrotax project team viewed: 26-9-2017

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