Catalog - Globotruncana fornicata cesarensis Catalog - Globotruncana fornicata cesarensis

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana fornicata cesarensis 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 cesarensis
Other pages this level: << < G. contusa scutilla, G. contusa witwickae, 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> >>

Globotruncana fornicata cesarensis

Citation: Globotruncana fornicata cesarensis Gandolfi 1955
taxonomic rank: sub-species
Type specimens: PI. 2, fig. 10a-c; 20838: type description p.45
Type sample (& lithostrat): Km. 92 section, S. 5587.
Type age (chronostrat): Campanian-Maastrichtian
Type locality: A section near Km. 92 on the Fonseca-Riohacha road, Rancheria Valley, 40 km. north of Fonseca, NE part of the State of Magdalena, northern Colombia.
Type repository: Ithaca, New York; Paleontological Research Institution

Current identification/main database link: Contusotruncana plummerae (Gandolfi, 1955)


Original Description

Form flat or slightly convex dorsally, the chambers (three-four in the last whorl) are considerably inflated on both sides, more strongly so on the umbilical one. It is similar to Glt. Fornicata plummerae, with chambers, however, more rapidly increasing in size, the last one usually considerably elongated and occupying half of the test. It shows a narrow, well-defined double keel, and a peripheral band which is nearly perpendicular to the plane of coiling. On the ventral side the sutures are radial and depressed; the last chamber is provided with more or less evident and Globotruncana-like terminal face; the test is rough especially in the early chambers and dextrally coiling.

Size:
Dimensions of holotype. Width 0.35 x 0.24 mm.; thickness, 0.17mm

Extra details from original publication
Remarks.— This form apparently represents a final stage of evolution with respect to the reduction of the number of chambers in the last whorl ( cf. Glt. tricarinata colombiana). The arched, elongated last chamber with median inner marginal depression remains a distinctive character.

References:

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


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

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