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Species Globigerinoides altiapertura Bolli 1957


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, chambers spherical, increasing rapidly in size as added, three in the umbilical aspect and three and a half in spiral aspect; sutures on both sides depressed and slightly curved; surface with large pores and small spine bases on the pore ridges , hispid on the final chamber. Primary aperture interiomarginal, umbilical, a high, distinct arch bordered by a rim. One supplementary sutural aperture opposite the primary aperture on the last few chambers.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gs. altiapertura is distinguished by its large, arched primary aperture and almost equal-sized supplementary aperture opposite the primary one. This species gave rise to Gs. obliquus.
Chaisson & Leckie (1993):
Remarks: A narrow definition of this species is employed. Any significant departure from roundness of the primary aperture led to the classification of a specimen as Globigerinoides obliquus. In the morphological transition from G. altiapertura to G. obliquus, lateral oblongation of the aperture seems to precede lateral compression of the chambers. The secondary aperture of G. altiapertura is depicted in some illustrations as being nearly as large as the primary aperture (e.g., Bolli, 1957; Poag, 1972), but such specimens are rare at this site, particularly in the early part of its range. Similar species: This species is distinguished from Globigerinoides obliquus by its more spherical chambers and round primary aperture.
Synonym list:
Kennett & Srinivasan (1983):
1957 Globigerinoides triloba altiapertura Bolli. - Bolli : p.113 pl 25 figs 7a-c
Chaisson & Leckie (1993):
1957 Globigerinoides triloba altiapertura Bolli. - Bolli : p.113 pl. 25; fig. 7a-c
1983 Globigerinoides triloba altiapertura Bolli. - Kennett & Srinivasan : p.54 pl. 10, fig. 1; pl. 11, fig. 4-6
1993 Globigerinoides altiapertura Bolli. - Chaisson & Leckie : p.170 pl. 2; fig. 9-11
Was used in synonym list of:
Globigerinoides altiaperturus Bolli 1957
References:

Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123

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

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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