Catalog - Liuella falklandica

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Other pages this level: L. falklandica

Liuella falklandica

Citation: Liuella falklandica Georgescu 2008

Type age (chronostrat): Campanian

Type locality: Falkland Plateau, DSDP Site 511

Type repository: Calgary, Canada; Willi K. Braun Micropaleontological Collection of the University of Calgary, Canada.

Test with very low trochospire, nearly planispiral, consisting of 12 to 17 globular to subglobular chambers, which gradually and slowly increase in size as added. There are 5 K to 6 chambers in the final whorl. Sutures are distinct, straight, radial and depressed. Test slightly asymmetrically biconvex in edge view. Periphery broadly rounded with an imperforate peripheral band, which is developed on all the chambers of the final whorl. Main aperture is in the shape of a low to medium high arch, interiomarginal, umbilical-peripheral in position and bordered by an imperforate lip. Umbilicus is of medium size, its diameter reaching approximately one third of the maximum test diameter. Relict apertures and periapertural structures are present in the umbilical area. Test wall calcitic, hyaline, perforate; perforation diameter varies between 1.7 and 3.1 mm; crater-like pores are developed on the earlier chambers of the test. Perforations can be occasionally present in the imperforate band area along the sutures. Test surface smooth."

Dimensions of the holotype. Maximum test diameter: Dmax = 0.229 mm, minimum test diameter: Dmin = 0.189 mm, Dmin/Dmax = 0.825, thickness: T = 0.108 mm, T/Dmax = 0.472.

Genus is named in honor of Dr. Chengjie Liu (ExxonMobil Exploration and Production) in appreciation for his studies on the Paleogene planktonic foraminifera. Species is named after the Falkland Plateau, where the type locality is situated.

Remarks. The presence of the imperforate peripheral band developed on the last whorl and crater-like pores on the earlier chambers of the test differentiate Liuella falklandica nov. sp. from any hedbergellid taxon. It differs from Hedbergella planispira (Tappan) in having (i) a smooth test surface rather than pustulose, (ii) larger pores rather than being finely perforate and (iii) presenting an imperforate peripheral band rather than lacking peripheral structures. Whiteinella loetterlei (Nauss) is a species with a hispid test surface as shown in the scanning electron microscope images by McNeil and Caldwell (1981, pl. 21, fig. 1).

References:

Georgescu, M. D. (2008a). A new planktonic foraminifer (Family Hedbergellidae Loeblich and Tappan, 1961) from the lower Campanian sediments of the Falkland Plateau, South Atlantic Ocean (DSDP Site 511). Journal of Foraminiferal Research. 38: 157-161. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Liuella falklandica Georgescu 2008

Liuella falklandica

References:

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