Catalog - Globotruncana (Praeglobotruncana) renzi primitiva Catalog - Globotruncana (Praeglobotruncana) renzi primitiva

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana (Praeglobotruncana) renzi subsp. primitiva Küpper 1956

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Globotruncana (Praeglobotruncana) renzi primitiva

Citation: Globotruncana (Praeglobotruncana) renzi subsp. primitiva Küpper 1956
Taxonomic rank: sub-species
Type specimens: PI. 8, fig. 2 a-c. Stanford Univ. Paleo. Type CoIl. No. 8323.
Type sample (& lithostrat): Antelope Shale; 1680 feet stratigraphically below the base of the Venado sandstone.
Type age (chronostrat): Upper Cenomanian,
Type locality: Loc. GGCM, Colusa County. California. 325 feet South, 500 feet West of the North East corner of Sec. 8, T. 17 N., R. 4 W., Mt. Diabll) base meridian, Colusa County, California, elevation 325 feet, 1680 feet stratigraphically below the base of the VenadD sandstone.
Type repository: Stanford University

Current identification:

See also: Globotruncana kuepperi - Thalmann, 1959, replacement name;


Original Description

Diagnosis: A subspecies of Globotruncana (Praeglobotruncana) renzi (Thalmann & Gandolfi) characterized by its rapidly opening spiral, the possession of a single prominent keel and depressed sutures on the ventral side.

Description: Outline slightly elongate, shape distinctly truncate. Dorsal side with rapidly opening spiral, well developed raised sutures and only slightly inflated chambers. The dorsal side is almost flat. On the ventral side 5 chambers are present, all inflated, separated by distinctly depressed sutures. The umbilicus is deep, no apertures are observable, other than a very narrow slit at the base of the last formed chamber within the umbilicus. The terminal chamber is elongate and unkeeled. The keel is broad and very distinct; a peculiar development is a strong ribbing which can be clearly observed in a lateral view.

Etymology:
primitiva-primitive, because of the relationship with Globotruncana (Praeglobotruncana) renzi renzi (Thalmann & Gandolfi) of which it is a more primitive relative.

Extra details from original publication
Comparisons: The relationship with Globotruncana (Praeglobotruncana) renzi renzi (Thalmann & Gandolfi) is obvious when comparing the dorsal side of the two subspecies. There is hardly any difference between those two forms in this respect. On the ventral side, however, we have in the new subspecies distinctly depressed sutures, whereas the typical form has limbate sutures, clearly raised and continuing along the margin, thus forming a normal second keel. This is in complete agreement with the stratigraphic distribution of the two subspecies.

Editors' Notes
This name proved to be homonym of Globotruncana ventricosa subsp. primitiva Dalbiez, 1955 and so Thalmann (1959) proposed the replacement name Globotruncana kuepperi

References:

Dalbiez, F. (1955). The genus Globotruncana in Tunisia. Micropaleontology. 1(2): 161-171. gs

Küpper, K. (1956). Upper Cretaceous Pelagic Foraminifera from the "Antelope Shale", Glenn and Colusa Counties, California. Contributions from the Cushman Foundation for Foraminiferal Research. 7(2): 40-47. gs

Thalmann, H. E. (1959). New names for foraminiferal homonyms. Contributions from the Cushman Foundation for Foraminiferal Research. 10(4): 130-. gs


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Globotruncana (Praeglobotruncana) renzi primitiva compiled by the pforams@mikrotax project team viewed: 13-3-2026

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Comments (3)

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Globotruncana (Praeglobotruncana) subsp. renzi primitiva Küpper 1956 subsp. between renzi and primitiva

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This species was renamed Globotruncana kuepperi Thalmann, 1959 (homonymy) please see: http://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=930677

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corrected, thanks Jeremy