Catalog - Globorotalia opima opima Catalog - Globorotalia opima opima

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia opima opima Bolli 1957

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globorotalia -> Globorotalia opima opima
Other pages this level: << < G. monmouthensis, G. multiloculata, G. munda, G. nagappai, G. nana pseudocontinuosa, G. nartanensis, G. naussi, G. neominutissima, G. nicobarica, G. nicolae, G. nicoli, G. obesa, G. occlusa, G. opima continuosa, G. opima nana, G. opima opima, G. orientalis, G. oscitans, G. palmerae, G. paniae, G. pentacamerata, G. perclara, G. perconigi, G. perforataminuta, G. pertenuis, G. petaliformis, G. planocompressa, G. planocompressa evoluta, G. planocompressa planocompressa, G. planoconica, G. planoconvexa> >>

Globorotalia opima opima

Citation: Globorotalia opima opima Bolli 1957
taxonomic rank: sub-species
Type specimens: Holotype ( P5659) and figured paratype ( P5660)
Type sample (& lithostrat): Cipero type section, Trinidad
Type age (chronostrat): type section of the Globorotalia opima opima zone
Type locality: Holotype (USNM P5659) and figured paratype (USNM P5660) from the type section of the Globorotalia opima opima zone, Cipero type section, Trinidad, sample JS 20 (TTOC 193265).
Type repository: Washington; USNM

Linked specimens: USNM-5660 USNM-5659

Current identification/main database link: Paragloborotalia opima (Bolli, 1957)


Original Description

Shape of test very low trochospiral; equatorial periphery slightly lobate; axial periphery rounded; due to the rapid increase in size of the chambers in the last whorl, the spiral side often appears slightly concave. Wall calcareous, perforate, surface finely pitted. Chambers spherical, 10-12, arranged in about 2½ whorls; the 4-5 chambers of the last whorl increase rapidly in size. Sutures on spiral side radial, depressed; umbilical side radial, depressed. Umbilicus narrow, deep. Aperture a fairly low arch, a slight rim or lip is only occasionally observed, interiomarginal, umbilicalextraumbilical. Coiling random. Largest diameter of holotype 0.55 mm.

Size:
Largest diameter of holotype 0.55 mm.

Extra details from original publication
Stratigraphic range (in Cipero formation) : Globorotalia opima opima zone.

Remarks: Globorotalia opima opima, new species, new subspecies, is distinguished from G. mayeri Cushman and EUisor by the greater thickness of the test and in having 4-5 chambers in the last whorl, instead of 5-6. The apertural lip, which is usually present in G. mayeri, is only occasionally seen ia the new subspecies. G. opima opima has a very restricted range whereas G. mayeri can be followed through most of the Cipero formation into the lower Lengua. G. opima opima differs from G. opima nana, new species, new subspecies, by its larger size. It has a more restricted stratigraphic range.

References:

Bolli, H. M. (1957b). 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. gs

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. gs

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Globorotalia opima opima compiled by the pforams@mikrotax project team viewed: 16-10-2024

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