CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina exumbilicata Herman 1974

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 -> Globigerina -> Globigerina exumbilicata
Other pages this level: << < G. edita, G. edita polycamera, G. eggeri, G. eggeriformis, G. elburganica, G. elevata, G. elongata, G. elongata Shutskaya, G. eocaena, G. eocaenica, G. eocaenica irregularis, G. esnaensis, G. euapertura, G. eugubina, G. eximia, G. exumbilicata, G. falconensis, G. fariasi, G. finlayi, G. fistulosa, G. flosculus, G. foliata, G. fragilis, G. fringa, G. frontosa, G. galapagosensis, G. galavisi, G. gaultina, G. gautierensis, G. gerpegensis, G. globigerinellinoides, > >>

Globigerina exumbilicata

Citation: Globigerina exumbilicata Herman 1974
Rank: species
Holotype Repository: USNM
Type & figured specimens: Holotype 186540

Linked specimens: USNM-186539 USNM-186540

Current identification/main database link:

See also: Globigerina quinqueloba egelida ;


Original Description
The small trochospiral test has a rounded lobate periphery; chambers are spherical, enlarging gradually, arranged in 3 to 3½ whorls; there are generally 4½ to 5 chambers in the last whorl. The final chamber is spherical and possesses a thin but distinct lip. The umbilicus is deep, and is surrounded by umbilical teeth. The aperture of the last chamber is a low arch, umbilical-extraumbilical. Sutures are distinct, narrow, and depressed. The wall is perforate, thin, and spinose; the coiling direction is random.

Extra details from original publication
The main difference between this taxon and Globigerina quinqueloba Natland is in the shape of the last chamber, which is spherical in the newly named species, and its well-developed umbilicus, higher spire, and larger size. The wall texture of the new taxon also differs from that of G. quinqueloba, as illustrated in plates 13 through 19. Electron-probe analyses indicate that the test is composed of three discrete layers; an outer and inner Mg-rich layer and an intermediate Ca-rich layer.

Distribution: G. exumbilicata is abundant in the shallow Northwind Escarpment and in Alpha Rise sediments deposited during the Matuyama epoch. In earlier publications (Herman 1970a; Herman et al., 1971) and in Figs. 2 and 14 this species was included with the counts of G. quinqueloba and was also referred to as Globigerina sp., cf. G. quinqueloba.

Editors' Notes
Herman 1980 argued that this was a junior synonym of G. quinqueloba egelida Cifelli & Scott 1970:
" In 1970, Cifelli and Smith established a new planktonic foraminiferal subspecies, Globigerina quinqueloba egelida (p. 32-34, PI. 3, figs 4-6). This taxon, present in plankton tows collected in the North Atlantic exhibits peak development in the western "Slope Waters" during winter and in the subarctic region during the summer. In 1974, the writer published an article in which a new planktonic foraminifer, Globigerina exumbilicata was described from Arctic Ocean basin Pleistocene and Pliocene sediments. Subsequently, Dr. Cifelli sent me specimens from his plankton tow collection which were examined under scanning electron microscopy. It appears that Globigerina exumbilicata Herman, 1974, is identical to Globigerina quinqueloba egilida Cifelli and Smith 1970, and the latter name has priority."

References:

Cifelli, R. J. & Smith, R. K. (1970). Distribution of planktonic foraminifera in the vicinity of the North Atlantic Current. Smithsonian Contributions to Paleobiology. 4: -. gs

Herman, Y. (1974). Arctic Ocean sediments, microfauna, and the climatic record in late Cenozoic time. In, Herman, Y. (ed.) Marine geology and oceanography of the Arctic seas. Springer-Verlag, Berlin 283-348. gs

Herman, Y. (1980b). Globigerina exumbilicata Herman, 1974, a synonym of G. quinqueloba egelida Cifelli and Smith, 1970. Journal of Paleontology. 54: 631-. gs


logo

Globigerina exumbilicata compiled by the pforams@mikrotax project team viewed: 26-9-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=130471 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics