Globoquadrina altispira globosa Bolli 1957 from: 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 | . |
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Subspecies Globoquadrina altispira globosa Bolli 1957 |
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| Diagnosis / Definition: |
Bolli (1957):
Shape of test medium to high trochospiral; equatorial periphery distinctly lobate. Wall calcareous, perforate, surface finely pitted, with short spines on well preserved specimens (figs. 10a-c). Chambers spherical to very slightly compressed laterally; 15-20, arranged in 3-4 whorls; the 5-6 chambers of the last whorl increase moderately in size. Sutures on spiral side radial, depressed; on umbilical side radial, depressed. Umbilicus fairly wide, deep. Aperture high, covered above by an elongate, toothlike flap; interiomarginal, umbilical. Coiling random in the Catapsydrax dissimilis zone, later becoming predominantly sinistral (as is also Globoquadrina altispira altispira and Globoquadrina dehiscens; Bolli, 1951). Largest diameter of holotype 0.7 mm. |
| Discussion / Comments: |
Bolli & Saunders (1985):
The subspecies of G. altispira differ from G. dehiscens in having a less angular test without a flattened spiral side. The chambers are more globose with usually more than 4 in the last whorl. Well preserved specimens usually show prominent apertural flaps extending into the umbilicus. The morphological range of the species has been used to erect the three subspecies. G. altispira globosa has a low spire with initially globular chambers becoming slightly laterally compressed. The central form, G. altispira altispira has a higher spire with more laterally compressed chambers. High spired forms with drawn out, laterally compressed later chambers originally included by Bolli (1957) in G. altispira altispira (Fig. 15.2) were separated as G. altispira conica by Brönnimann & Resig (1971). We find all three subspecies to he long ranged whereas Brönnimann & Resig recorded their new subspecies over only a short time interval from zones N 14 to base N 16. The G. altispira group became extinct before the end of the Middle Pliocene and this is important stratigraphically.
Bolli (1957):
Globoquadrina altispira globosa, new subspecies, is distinguished from G. altispira altispira (Cushman and Jarvis) by having more globular chambers.
Van Eijden & Smit (1991):
Remarks. Occurring in the Oligocene-Miocene at Site 758, it is connected to Globigerina praebulloides Blow, 1959 by intermediate forms. |
| Systematics: |
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Familia Globigerinidae
Genus Globoquadrina
Subspecies Globoquadrina altispira globosa
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| Synonym list: |
Bolli & Saunders (1985):
Bolli (1957):
Van Eijden & Smit (1991):
Quilty (1976):
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| Was used in synonym list of: |
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| 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
Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34
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
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
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