Catalog - Globotruncana fornicata manaurensis Catalog - Globotruncana fornicata manaurensis

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana fornicata manaurensis Gandolfi 1955

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 fornicata manaurensis
Other pages this level: << < G. convexa, G. culverensis, G. dalbiezi, G. dentata, G. dorreeni, G. dupeublei, G. erevanica, G. falsocalcarata, G. falsostuarti, G. fareedi, G. flexuosa, G. fornicata, G. fornicata ackermanni, G. fornicata cesarensis, 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> >>

Globotruncana fornicata manaurensis

Citation: Globotruncana fornicata manaurensis Gandolfi 1955
taxonomic rank: sub-species
Type specimens: PI. 2. fig. la-c. Text fig. 9(la-c), 9(2a-c) ; 20834: type description p.41
Type sample (& lithostrat): Manaure section, S. 9168.
Type age (chronostrat): Campanian-Maastrichtian
Type locality: Cesar Valley, Rio Manaure, 100 km. ESE of La Paz; northern Colombia
Type repository: Ithaca, New York; Paleontological Research Institution

Current identification/main database link: Marginotruncana manaurensis (Gandolfi 1955)


Original Description

Test convex on the dorsal side, double-keeled, subcircular with a narrow peripheral band; the second keel only slightly shifted toward the umbilicus; chambers becoming long, arched, elongated in the adult stage, sutural elevations thinner than in Glt. lapparenti lapparenti, but continuously raised on the umbilical side, running with sigmoidal development, but bending sharply back and tending to attach themselves to the previous ones. The last ones sometimes still plunge within the umbilical cavity. The test is generally smooth; the umbilical cavity is large with thin, long, nearly straight apertural lips. The specimens investigated are dextrally coiling.

Size:
Dimensions of holotype: Width 0.41 x 0.38 mm.; thickness 0.22mm

Etymology:
from the name of the Manaure shale, Cesar Valley.

Extra details from original publication
Remarks.— Of phylogenetic interest is the "lapparenti" appearance of this primitive fornicata type. Though the material is not abundant, all intermediate stages are present and connect this form with Glt. lapparenti longilocula on one side and with Glt. fornicata fornicata on the other side. Some tests show a more pronounced dorsal convexity with either extremely elongated chambers such as to be transitional toward Glt. contusa scutilla or with larger final chambers and more lobated contour such as to be connected with Glt. caliciformis-intermedia tests. In the Manaure shale and in the lower Colon formation all degrees of intermediate stages were found connecting this form with Glt. fornicata plumnierae.

References:

Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletins of American Paleontology. 36: 1-118. gs


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Globotruncana fornicata manaurensis compiled by the pforams@mikrotax project team viewed: 25-7-2024

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