CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana arcaformis Maslakova 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 -> Globotruncana -> Globotruncana arcaformis
Other pages this level: G. adamsi, G. aegyptiaca, G. aegyptiaca duwi, G. alpina, G. andori, G. ansarii, G. appenninica, G. arabica, G. araratica, G. arca caribica, G. arca esnehensis, G. arcaformis, G. aspera, G. asymetrica, G. atlantica, G. aturica, G. azerbaidjanica, G. bahijae, G. bollii, G. bulloides naussi, G. calcarata, G. calcarata arcata, G. calcarata primitiva, G. calcarata retardata, G. caliciformis sarmientoi, G. caliciformis trinidadensis, G. campbelli> >>

Globotruncana arcaformis

Citation: Globotruncana arcaformis Maslakova 1974
Rank: Species

Current identification/main database link: Globotruncana arca (Cushman, 1926)

Original Description
Test large, with a slightly convex spiral side and a flattened or slightly concave umbilical side, consists of 3 whorls. In the first whorl are 5-6 small spherical chambers. From the start of the second whorl there is a sharp change in size and shape of the chambers, the peripheral margin becomes keeled, and sutural and circum-umbilical flanges appear; there are 5-6 angularly truncated chambers, rapidly increasing in size, in the whorl: on the spiral side of the test at the beginning of the whorl the chambers are semicircular, at the end sickle-shaped; septal sutures bordered, convex, on the spiral side oblique, slightly curved, on the umbilical side radial, strongly curved. Peripheral margin with two parallel keels. Inter-keel area quite broad, slightly concave. Test outline round or slightly oval, lobate. Umbilicus broad, surrounded by well expressed circum-umbilical flanges, nearly hall the width of the test. Principal aperture umbilical. Apertural lips forming supra-umbilical supplementary apertures not discernible, since the umbilicus in the specimens studied is filled with rock. Surface of chambers rough; keels, sutural and circum-umbilical flanges coarsely rough. Right-coiling.


Maslakova, N. I. (1974). New foraminifera of the genus Globotruncana from the Upper Cretaceous deposits of the southern USSR. Paleontologicheskii Sbornik, Lvovskogo Geologicheskogo Obshchestva. 10(2): 12-16. gs


Globotruncana arcaformis compiled by the pforams@mikrotax project team viewed: 30-7-2021

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