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Species Globigerinatella insueta Cushman & Stainforth 1945


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test small, subglobular, early portion trochospiral with the final chamber usually embracing; chambers of the early portion spherical, rapidly increasing in size; the large, embracing final chamber constitutes more than 70 percent of the test; surface smooth, in large part covered by tiny crystallites and with extremely small microperf orations; aperture in the early stage interiomarginal-umbilical, in the later chambers with secondary sutural and areal apertures, surrounded by distinct lips, with small knobby pustule-like bullae sometimes covering the areal secondary apertures or crescent-shaped sutural bullae cover the secondary sutural apertures. All bullae may have infralaminal accessory apertures.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gt. insueta is distinguished from its ancestor Globigerinita glutinata by its embracing final chamber and by its second- ary sutural and areal supplementary apertures.
Bolli & Saunders (1985):
The species is readily recognizable by its more or less globular test with irregularly distributed bullae, which are either small, more or less circular in shape and covering individual sutural or areal apertures, or may extend, tube like, along intercameral sutures. Superficially juveniles of the species are closest to Globigerinita naparimaensis, which however differs in a less globular test and in possessing only one bulla that extends along the sutures on the umbilical side. There are also no areal apertures with bullae in G. naparimaensis. Broken specimens of Globigerinatella insueta frequently show areal apertures on earlier chambers, often surrounded by small raised lips, a feature that is very characteristic for the species (Fig. 18.6).
Chaisson & Leckie (1993):
Remarks: The areal secondary apertures on early forms can be very few (1 or 2) and difficult to find. They can become blocked with chalk and resemble dimpled pustules. When the areal apertures become more numerous on later forms, they occur in patches on the final chamber. Similar species: Species of Orbulina are cancellate and more spherical. Early forms of Globigerinatella insueta with few areal apertures are distinguished from Praeorbulina sicana by their microperforate wall in contrast to the distinctly cancellate wall of the latter taxon. G. insueta is gradational with Globigerinita glutinata in the early part of its range (e.g., see Plate 10, Fig. 3). These early forms are primarily distinquished by the oversized final chamber, more extensive sutural bullae, presence of areal bullae, and the occasional areal aperture (see Bolli et al., 1957).
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinatella
          Species Globigerinatella insueta
Synonym list:
Kennett & Srinivasan (1983):
1945 Globigerinatella insueta Cushman & Stainforth. - Cushman & Stainforth : p. 69 pl 13 figs 7-9
Chaisson & d'Hondt (2000):
1983 Globigerinatella insueta Cushman & Stainforth. - Kennett & Srinivasan : p.228 pl 56 fig 2, pl 57 figs 4,5
Bolli & Saunders (1985):
1945 Globorotalia insueta Cushman & Stainforth. - Cushman & Stainforth : p.69 pl. 13, figs. 6-9
1985 Globorotalia insueta Cushman & Stainforth. - Bolli & Saunders : p.189 figs. 18.3-6; 7,9,12
Bolli (1957):
1945 Globigerinatella insueta Cushman & Stainforth. - Cushman & Stainforth : p. 69 pl. 13, figs. 7-9
1950 Globigerinatella insueta Cushman & Stainforth. - Brönnimann : pp. 80-82 pl. 13, figs. 1-12, pl. 14, figs. 1-13
1957 Globigerinatella insueta Cushman & Stainforth. - Bolli :
1957 Globigerinatella insueta Cushman & Stainforth. - Bolli et al. : p. 38 pl. 8, figs. 4-7
Vincent & Toumarkine (1990):
1945 Globigerinatella insueta Cushman & Stainforth. - Cushman & Stainforth : p. 69 pl. 13, figs. 7-9
1990 Globigerinatella insueta Cushman & Stainforth. - Vincent & Toumarkine : p. 796
Chaisson & Leckie (1993):
1945 Globigerinatella insueta Cushman & Stainforth. - Cushman & Stainforth : p.69 pl. 13; fig. 7-9
1983 Globigerinatella insueta Cushman & Stainforth. - Kennett & Srinivasan : p.228 pl. 56, fig. 2; pl. 57, fig. 4-5
1993 Globigerinatella insueta Cushman & Stainforth. - Chaisson & Leckie : p.178 pl. 10; fig. 4-6
Quilty (1976):
1945 Globigerinatella insueta Cushman & Stainforth. - Cushman & Stainforth : p.69 pl. 13, figs. 7-9
1976 Globigerinatella insueta Cushman & Stainforth. - Quilty : 681, 683 pl. 8, fig. 22; pl. 9, figs. 1-2
Stratigraphy - absolute ages:
FAD: 18.8 ± 0 [Ma], Berggren et al. (1995)
References:

Cushman,J.A. and Stainforth,R.M. (1945):
The foraminifers of the Cipero Marl Formation of Trinidad, British West Indies . Journal of Foraminiferal Research Vol. 14 p. 1-75

Brönnimann,P. (1950):
Occurrence and ontogeny of Globigerinatella insueta Cushman and Stainforth from the Oligocene of Trinidad, B. W. I. . Contr. Cushman Found. Foram. Res. Vol. 1 p. 80-82

Bolli,H.M.; Loeblich,A.R. and Tappan,H. (1957):
The Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae, and Globotruncanidae . U.S. National Museum Bull. Vol. 215 p. 3-50

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

Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34

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

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836

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

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
Anonymous: Unedited TaxonConcept data
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