Catalog - Fingeria

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Fingeria

Citation: Fingeria Georgescu 2010

Type species: Fingeria kingi (Trujillo, 1960).

Diagnosis. Late Cenomanian–early Campanian globular- chambered trochospiral planktic foraminifera with incipient meridional ornamentation. Description. Test is low to medium high trochospiral, consisting of globular chambers that increase in size at low to moderate, rarely high rates. Sutures are distinct and depressed, perpendicu- lar to oblique on the previous whorl on the spiral side and straight and radial on the umbilical one. Periphery is broadly rounded, without peripheral structures. Umbilicus is small to medium sized, its diameter representing one-fifth to one-third of the maximum test diameter; the widest umbilici occur in evolved species. Aperture is a low to medium high arch, umbilical– extraumbilical in position and bordered by flaps. Ornamentation consists of scattered, often randomly distributed and occasionally aligned pustules and rugosities in the primitive species and aligned or not pustules, rugosities and occasional costellae in the evolved species; an ornamentation pattern that is loosely meridional or parallel to the periphery can be developed over isolated chambers. Test wall is calcitic, hyaline and perfor- ate; pore diameter ranges from 1.7 to 4.9 μm.

Genus named after Dr Kenneth Finger (University of California, Berkeley) for his contributions to the study of foraminifera; suffix ‘-ia’ is added to his name.

Remarks. Fingeria is a directional lineage consisting of two composite palaeontological species, which present significant ornamentation variability; pustules are the dominant ornamentation elements but rugosities and faint costellae may occur over some chambers in some specimens. An incipient meridional pattern can sporadically occur in both species. These features separate it from Whiteinella, which has tests ornamented with scattered and isolated pustules. Fingeria differs from the Archaeoglobigerina blowi Pessagno, 1967 – A. cretacea (d’Orbigny, 1840) group of species by having a broadly rounded and simple periphery rather than with an imperforate peripheral band bordered by two rows of pustules or weak keels and ornamentation with occasionally developed rugosities and incipient meridional pattern. It differs from Paracostellagerina Georgescu & Huber, 2006 (late Albian–early Cenomanian), Costellagerina Petters, El-Nakhal & Cifelli, 1983 (Santonian–early Campanian) and Rugoglobigerina Brönnimann, 1952 (late Campanian– Maastrichtian) mainly by lacking a consistently ornamented chamber surface with costellae that show well-developed meridi- onal pattern or one that is parallel to the periphery. Meridionalla El-Nakhal, 1982 (type species: Hedbergella murphyi Marianos & Zingula, 1966) is a trans-lineage genus based on nonexistent features (i.e. costellae) in the type species and can be considered valid only if the presence of consistent costellate ornamentation can be documented in the designated type species (El-Nakhal, 1982).

Geographical distribution. Cosmopolitan.

Range: Turonian–lower Campanian (from the Helvetoglobotruncana helvetica Biozone to the Globotruncanita elevata Biozone).

References:

Georgescu, M. D. (2010b). Evolutionary classification of the Upper Cretaceous (Turonian–lower Campanian) planktic foraminifera with incipient meridional ornamentation. Journal of Micropalaeontology. 29: 149-161. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Fingeria Georgescu 2010

Fingeria

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