Catalog - Globotruncana helvetica posthelvetica Catalog - Globotruncana helvetica posthelvetica

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana helvetica posthelvetica Hanzlikova 1963

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 helvetica posthelvetica
Other pages this level: << < G. fornicata globulocamerata, G. fornicata manaurensis, G. fornicata motai, G. fornicata plummerae, G. fresnoensis, G. fundiconulosa, G. gagnebini, G. gansseri, G. gansseri gandolfii, G. gansseri subgansseri, G. globigerinoides, G. goudkoffi, G. hanzawai, G. havanensis, G. helvetica, G. helvetica posthelvetica, G. hilli, G. imbricata, G. indica, G. inornata, G. intermedia, G. intermedia difformis, G. japonica, G. japonica robusta, G. kuepperi, G. lakrai, G. lamellosa, G. lapparenti, G. lapparenti coronata, G. lapparenti depressa, G. lapparenti inflata> >>

Globotruncana helvetica posthelvetica

Citation: Globotruncana helvetica posthelvetica Hanzlikova 1963
taxonomic rank: sub-species

Current identification/main database link: Helvetoglobotruncana helvetica (Bolli, 1945)


Original Description

More than half of the tests from the material studied is evolute, irregularly hemispherical. All the specimens coil dextrally. The dorsal side is flatly undulated up to concave, its surface is smooth with expressive ornamentation formed by a keel. The ventral side consists of blown spherical g!obigerine-shaped chambers, it is inflated and its diameter extends over the dorsal part with a keel. The chamber walls are covered with rough papillas up to pustules, which are as a rule, arranged radially, sometimes also horizontally. The number of chambers varies from 4 to 7 in every whorl, especially, in the last one. The chambers are frequently of a different size, they enclose a varied large and deep umbilical area which is larger in the evolute specimens. The youngest chamber is usually smooth, often immature and devoid of a keel. Aperture .interiomarginal, in most cases indistinct, in some specimens tegillum can be seen. The test is considerably fossilized. Keel very .smooth, rarely papillose, bordering expressively the earlier chambers.

References:

Georgescu, M. D. (2012c). Origin, evolutionary classification, and biostratigraphic significance of the Late Cretaceous planktic foraminiferal directional lineage Bollitruncana O.A. Korchagin, 2001. Studia UBB Geologia. 57: 3-16. gs

Hanzlíková, E. (1963). Globotruncana helvetica posthelvetica n. subsp. from the Carpathian Cretaceous. Vestnik Ustredniho Ustavu Geologickeho. 38: 325-327. gs


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Globotruncana helvetica posthelvetica compiled by the pforams@mikrotax project team viewed: 20-6-2024

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