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Species Globigerina ampliapertura Bolli 1957


Diagnosis / Definition:
Bolli (1957):
Shape of test trochospiral; spiral side almost flat to slightly convex, umbilical side convex; equatorial periphery lobate; axial periphery rounded. wan calcareous, perforate, surface finely pitted. Chambers spherical in the early stage, becoming somewhat compressed laterally in the last whorl; about 12, arranged in 2 1/2 whorls; the usually 4 chambers of the last whorl increase rapidly in size. Sutures on spiral side radial to oblique, depressed; on umbilical side radial, depressed. Umbilicus fairly small, deep. Aperture a high, distinct arch; interiomarginal, umbilical. Coiling random. Largest diameter of holotype 0.55 mm.
Discussion / Comments:
Bolli (1957):
Globigerina ampliapertura, new species, is distinguished from G. venezuelana in having a larger, distinctly arched aperture. It differs from G. apertura Cushman, which was described from the Miocene, in having the chambers of the last whorl somewhat compressed laterally and in the aperture being smaller in relation to the chamber size. The G. apertura mentioned by Bronnimann (1950, p. 80) from the Cipero formation is a G. ampliapertura. The new species occurs also in the upper Eocene.
Globigerina ampliapertura, which appears in the uppermost Eocene and continues into the basal Oligocene, seems to be genetically related to Globorotalia centralis Cushman and Bermudez. Intermediate forms (USNM P5719a,b) showing the aperture in a transitional position, are commonly found in the Globorotalia cocoaensis zone (pl. 36, figs. 9, 10). The species might represent a gerontic stage of the G. centralis G. cocoaensis strain, 7 reverting before its ex¬tinction to a globigerinid form and also to random coiling.
Van Eijden & Smit (1991):
Remarks. This distinct marker species is rare in early Oligocene faunas.
Spezzaferri & Silva (1990):
Typical specimens are very rare. Wall surface of this taxon is cancellate, possibly spinose (see Blow and Banner, 1962), then its generic attribution is still uncertain.
Systematics:

22
 Genus Dentoglobigerina
  Species Globigerina ampliapertura

24
  Genus Globigerina
   Species Globigerina ampliapertura

32
 Ordo Foraminiferida
  Familia Globigerinidae
   Genus Globigerina
    Species Globigerina ampliapertura
Synonym list:
Bolli (1957):
1957 Globigerina ampliapertura Bolli. - Bolli : pl. 22, figs. 4a-7b new species
Bolli (1957):
1957 Globigerina ampliapertura Bolli. - Bolli : p. 273 pl. 36, figs. 8a-c
1957 Globigerina ampliapertura Bolli. - Bolli : p. 108 pl. 22, figs. 4a-7b
Van Eijden & Smit (1991):
1957 Globigerina ampliapertura Bolli. - Bolli et al. : p.108 pl. 22, figs. 4-7
1991 Globigerina ampliapertura Bolli. - Van Eijden & Smit : p.109
Spezzaferri & Silva (1990):
1957 Globigerina ampliapertura Bolli. - Bolli : pl. 22; fig. 5-6
1990 "Globigerina" ampliapertura Bolli. - Spezzaferri & Silva : p.254 pl. XIII; fig. 6a-d
Quilty (1976):
1957 Globigerina ampliapertura Bolli. - Bolli : p.108 pl. 22, figs. 5-7
1976 Globigerina ampliapertura Bolli. - Quilty : p.667 pl. 1, figs. 1-2
Was used in synonym list of:
Globigerina prasaepis Blow 1969
Turborotalia ampliapertura Bolli 1957
References:

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

Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172

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

Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263

Van Eijden,A.J.M. and Smit,J. (1991):
Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 121 Eds: Weissel, J.Peirce, J.Taylor, E.Alt, J. p. 77-123
Anonymous: Unedited TaxonConcept data
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