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Species Globigerinoides tenellus Parker 1958


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test small, low trochospire, chambers spherical, four in the final whorl, rapidly increasing in size as added; sutures curved 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.
Discussion / Comments:
Kennett & Srinivasan (1983):
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.
Bolli & Saunders (1985):
The major features of the species are its small size, strongly lobate equatorial outline, large primary aperture almost circular in outline, small and narrow supplementary apertures on the spiral side of the last chamber, more rarely in earlier chambers, and a wall surface roughened by dense, short spines. The species was first described from the Holocene but is also documented throughout the Pleistocene. In the Mediterranean area it is considered a good marker for this interval (Blow, 1969; Colalongo & Sartoni, 1977).
Chaisson & Leckie (1993):
Remarks: Rare. When Globigerina rubescens develops a secondary aperture, it becomes Globigerinoides tenellus.
Synonym list:
Kennett & Srinivasan (1983):
1958 Globigerinoides tenella Parker. - Parker : p.280 pl 6 figs 7-11
Bolli & Saunders (1985):
1958 Globigerinoides tenellus Parker. - Parker : p.280 pl.6, fig.7(holotype), figs.8-11(paratype)
1985 Globigerinoides tenellus Parker. - Bolli & Saunders : p.193 fig. 20.7
Chaisson & Leckie (1993):
1958 Globigerinoides tenella Parker. - Parker : p.280 pl. 6; fig. 7-11
1983 Globigerinoides tenellus Parker. - Kennett & Srinivasan : p.80 pl. 17; fig. 7-9
Was used in synonym list of:
Globoturborotalita tenella Parker 1958
References:

Parker,F.L. (1958):
Eastern Mediterranean Foraminifers . Reports of the Swedish Deep-Sea Expedition 1947-1948 Vol. 8

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Chaisson,W.P. and Leckie,R.M. (1993):
High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178
Anonymous: Unedited TaxonConcept data
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