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Species Globigerina apertura Cushman 1918


Alternative name:
Globigerina (Zeaglobigerina) apertura Cushman 1918
Discussion / Comments:
Iaccarino (1985):
The species is recognizable by its characteristically large, semicircular aperture and low trochospire. It was considered as a subspecies of Globigerina bulloides by Blow (1969), but its large aperture is a stable distinguishing feature which justifies its retention as a separate species. G. riveroae Bolli & Bermudez, which according to Blow (1969) is a junior synonym of G. apertura due to its similarly large aperture, is here considered as a separate species because it differs from G. apertura in having a more elevated trochospire. The shape and size of the aperture of G. apertura recalls that of G. woodi and the analogies are so close that Jenkins (1960) reported the existence of intermediate forms. Colalongo et at. (1979b) illustrated forms called by them G. woodi apertura.
Chaisson & Leckie (1993):
Remarks: Globigerina apertura is particularly common in the uppermost Miocene to mid-Pliocene (Subzone N17b to upper Zone N18/N19). Similar species: The aperture of Globigerina apertura is very large and often wider than it is high, distinguishing it from both G. woodi and G. rubescens. G. apertura differs from G. decoraperta in having a lower trochospire. The latter two taxa are gradational.
Synonym list:
Iaccarino (1985):
1918 Globigerina apertura Cushman. - Cushman : p.57 pl. 12, figs. 8a-c
1985 Globigerina apertura Cushman. - Iaccarino : p.301 figs. 5.9; 4
Chaisson & Leckie (1993):
1918 Globigerina apertura Cushman. - Cushman : p.57 pl. 12; fig. 8a-c
1983 Globigerina (Zeaglobigerina) apertura Cushman. - Kennett & Srinivasan : p.44 pl. 8; fig. 4-6
1993 Globigerina apertura Cushman. - Chaisson & Leckie : p.169 pl. 1; fig. 6
Was used in synonym list of:
Globoturborotalita apertura Cushman 1918
Globigerina (Zeaglobigerina) apertura Cushman 1918
References:

Cushman,J.A. (1918):
Some Miocene foraminifers of the coastal plain of the United States. , US. Geological Survey Bulletin Vol. 676

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

Iaccarino,S. (1985):
Mediterranean Miocene and Pliocene planktic foraminifera.
In: Plankton stratigraphy Eds: Bolli, H.M.Saunders, J.B.Perch-Nielsen, K. p. 283-314

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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