CATALOG OF ORIGINAL DESCRIPTIONS: Liuenella nadinae Korchagin 2011
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.
Citation: Liuenella nadinae Korchagin 2011Taxonomic rank: speciesType specimens: Plate 1, figs. 1 and 2, Plate 2, fig. 1; GIN, no. 4899/1Type age (chronostrat): Middle–Upper Turonian.Type locality: Crimea, B’yukType repository: Moscow; Geological Institute, Russian Academy of Sciences
Current identification:
Original Description The shell is low trochoid, sinistral or dextral, biconvex, slightly asymmetrical, with 2.5 whorls of the spire. The outline is circular or slightly ovate, strongly lobate. The last whorl includes five or six spherical chambers slightly laterally flattened and gradually increasing in size. Early whorls are distinct on the side of spire. Chambers of the early whorl are either positioned in the same plane as chambers of the last whorl or slightly elevated above the last whorl. The chambers on the spiral and umbilical sides are separated by deep straight radial septal sutures. The surface is slightly spinate, sometimes, moderately spinate or even coarsely spinate, becoming smooth only on the last chamber. On the umbilical and spiral sides, chambers of the last whorl are covered with irregularly oriented crater-like pores; crater-like pores are sometimes also discernible on chambers of the early whorl. The pore openings are up to 2.0 μm in diameter and craters are up to 4.5 μm in diameter. The main aperture is moderately arched, externally umbilical–umbilical; the umbilical region is widely open partially covered by a large plate of the main aperture and short relict supraapertural lips (porticos). The periphery is widely circular or ovate–circular, covered with small widely spaced cylindrical pores without craters. Size: Measurements in μm. Holotype: GIN, no. 4899/1: long diameter, 300; small diameter, 240; thickness of early chambers of the last whorl, 50; shell thickness in the last whorl, 130; paratype GIN, no. 4899/2: long diameter, 270; small diameter, 160; thickness of early chambers of the last whorl, 70; shell thickness in the last whorl, 100; paratype GIN, no. 4899/3: diameter, 270; thickness of early chambers of the last whorl, 70; shell thickness in the last whorl, 80. Etymology: From the Latin translation of the old Slavic name Nadezhda, in honor of my wife. Extra details from original publication Variability. The shells examined include specimens (paratype GIN, no. 4899/2) with crater-like pores, but having a more spinate surface of chambers than others, a sharpened periphery, and a wider supra-apertural plate (portico?) of the main aperture; and wider supra-apertural plates (porticos) of the relict apertures. Comparison. The new species differs from congeners in the spinate, sometimes roughly spinate rather than smooth surface of chambers, in the higher spire of the shell, the early shell whorl elevated above the last whorl, and sometimes sharpened periphery.
Material. Ten perfectly preserved shells.
References:
Korchagin, O. A. (2011a). New species of planktonic foraminifers of the genus Liuenella from the Middle-Upper Turonian of the Crimea, Ukraine. Paleontological Journal. 45: 593-598. gs
Liuenella nadinae compiled by the pforams@mikrotax project teamviewed: 12-2-2026
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Korchagin 2011 pl1 f1a-c.JPG
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Korchagin 2011 pl1 f2d.JPG
Korchagin 2011 pl2 f1a-c.JPG
Korchagin 2011 pl1 f1a-c.JPG
Korchagin 2011 pl1 f1d.JPG
Korchagin 2011 pl1 f2a-c.JPG
Korchagin 2011 pl1 f2d.JPG
Korchagin 2011 pl2 f1a-c.JPG
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