Catalog - Globorotalia convexa Catalog - Globorotalia convexa

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia convexa Subbotina 1953

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 convexa
Other pages this level: << < G. cavernula, G. caylaensis, G. centralis, G. cerroazulensis cunialensis, G. cerroazulensis pomeroli, G. cerroazulensis possagnoensis, G. challengeri, G. chapmani, G. cibaoensis, G. cocoaensis, G. collactea, G. conica, G. conicotruncata, G. conomiozea, G. conomiozea mons, G. convexa, G. crassacarina, G. crassaconica, G. crassacrotonensis, G. crassaformis ronda, G. crassata aequa, G. crassula, G. crater, G. crimensis, G. crosswicksensis, G. crotonensis, G. crozetensis, G. crystalriverensis, G. cushmani, G. dalii, G. decorata> >>

Globorotalia convexa

Citation: Globorotalia convexa Subbotina 1953
Taxonomic rank: species
Type specimens: Pl. 17, figs. 2-3, holotype and "original," respectively, X 72: a, dorsal views; b, ventral views; c, peripheral views.
Type age (chronostrat): Lower-middle Eocene, series F1, zone of conical Globorotalias. Ranges from the Danian? to the middle Eocene; and occurs in the zones of Rotalia-like Globorotalias, flattened Globorotalias, and conical Globorotalias.
Type locality: Nalchik, along the Kheu River, Northern Caucasus, U.S.S.R. Found also elsewhere in the Northern Caucasus.
Type repository: VNIGRI

Current identification/main database link: Igorina tadjikistanensis (Bykova 1953)


Original Description

[Translation from the Russian. - Test rounded, biconvex. Two whorls. Umbilicus very small, or, rather than an umbilicus, there may be only a weak depression. Peripheral border lobate and sharp, keel not expressed. In most specimens there are six, chambers in the final whorl. Dorsally, the chambers have an alar or semicircular outline, and ventrally they are triangular. Chamber dimensions in the final whorl are almost uniform. Surfaces of the chambers distinctly convex, except in the final chamber, which is concave. Septal sutures depressed, slightly curved. Spiral suture slightly sinuous. Aperture a small, slightly curved slit, extending from the umbilicus to the middle of the marginal suture. A thin lip which covers the aperture is often observed. Wall thin, finely porous, densely and evenly covered by small uniform spines. Dimensions: Diameter 0.16-0.20 mm.; thickness 0.05-0.07 mm.

Size:
Dimensions: Diameter 0.16-0.20 mm.; thickness 0.05-0.07 mm.

Extra details from original publication

[Basically, this species differs in the marked inflation of its test and in having a larger number of chambers than closely related Globorotalias such as Globorotalia pseudoscitula Glaessner and Globorotalia planoconica Subbotina. Specimens are often found with as many as seven chambers in the final whorl, but the final chamber is always bulla-like, with a markedly thinner and smoother wall, and is always smaller than the penultimate chamber.]

References:

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

Subbotina, N. N. (1953). Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs


logo

Globorotalia convexa compiled by the pforams@mikrotax project team viewed: 22-5-2025

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=131103 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image

Comments

No comments yet. Be the first!