Catalog - Globorotalia opima nana

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Globorotalia opima nana

Citation: Globorotalia opima nana Bolli 1957

Type age (chronostrat): Globorotalia opima opima zone

Type locality: Holotype (USNM P5661) from the type section of the Globorotalia opima opima zone, Cipero type section, Trmidad, sample JS 20 (TTOC 193265).

Type repository: Washington; USNM

Shape of test very low trochospiral; equatorial periphery slightly lobate, of a somewhat quadrangular aspect in four-chambered specimens; axial periphery roimded. Wall calcareous, perforate, surface finely pitted. Chambers spherical; about 10, arranged in about 2 whorls; the 4-5 chambers of the last whorl increase fairly rapidly in size. Sutures on spiral side radial, depressed; on umbilical side radial, depressed. Umbilicus narrow, deep. Aperture a low arch, a rim or lip is often present; interiomarginal, umbilical-extraumbilical. Coiling random.

Largest diameter of holotype 0.3 mm.

Stratigraphic range (in Cipero formation): Globigerina ampliapertura zone to Globigerina ciperoensis ciperoensis zone. Similar forms occur sparsely in the higher zones of the Cipero formation.

Remarks: Globorotalia opima nana, new species, new subspecies, is distinguished from G. mayeri Cushman and Ellisor by greater relative thickness of test and by having 4-5 chambers in the last whorl, instead of 5-6. The range of the new subspecies is restricted to the lower part of the Cipero formation, while that of G. mayeri extends into the lower Lengua. G. opima nana differs from G. opima opima, new species, new subspecies, by its smaller size. It has a more extended stratigraphic range

References:

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

Leckie, R. M., et al. (2018). Leckie, R. M. et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 5): 67-110. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 5): 67-110. gs O

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia opima nana Bolli 1957

Globorotalia opima nana

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