CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana samuriensis 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.
Original Description Test large, flattened. Spiral side flat or slightly convex, umbilical side weakly convex. Three whorls. In the first whorl there arc usually 5 small spherical chambers. The second whorl consists of 5, more rarely 6, much larger, rapidly enlarging chambers; they become angularly truncated in shape owing to lateral flattening and the appearance of a double keel on the peripheral margin; circum-umbilical flanges arise; the chambers on the spiral side are semicircular, the septal sutures bordered, convex, radial, curved. In the last whorl there are usually 6-7 angularly conical chambers gradually increasing in size; often the last one or sometimes the last two are smaller than the preceding chambers; the chambers on the spiral side at the beginning of the whorl are semicircular in outline, then become roundly rectangular, and are rounded-rectangular on the ventral side; septal sutures radial, on the spiral side bordered, convex, slightly curved, on the umbilical side linear, depressed, nearly straight. Peripheral margin of test with two adjacent keels, which merge into a single keel in the last one or two, more rarely three, chambers; umbilical keel usually more weakly developed than spiral keel. Test outline rounded or slightly oval, lobate. Umbilicus broad. Circum-umbilical flanges well expressed. Principal aperture umbilical. In the umbilicus of many specimens fragments of the long, slightly curved apertural lips, forming supra-umbilical supplementary apertures, are observed. Surface of chambers rough, nearly smooth; septal. Circum-umbilical flanges and keel coarsely rough; at the beginning of the last whorl on the keels (especially the spiral keel) in many forms short spines are observed. Right-coiling.
References:
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 samuriensis compiled by the pforams@mikrotax project teamviewed: 11-2-2025
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