Catalog - Hantkenina liebusi

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Hantkenina liebusi

Citation: Hantkenina liebusi Shokhina 1937

"Test planispiral, compactly coiled, almost completely involute, bilaterally symmetrical. Contour oval, elongate at the apertural end. The test consists of two whorls, usually only the last one visible, with 5-6 chambers; in young specimens the chambers of the first volution are clearly visible. Chambers slightly inflated, internal end more vaulted, outer angle extended into a hollow acicular spine. The spines are mostly long and thin, but in some specimens they were found to be rather stout and granulate. "The periphery is lobulate, mostly more or less rounded, but may be slightly angled. The size of the chambers increases gradually, except in the last one which is almost twice as large as the preceding one. Chambers separated by rather deep sutures. The chamber walls are calcareous and mostly thin, in some cases slightly thickened, transparent and smooth, finely perforate. The aperture is situated at the inner margin of the chamber and consists of 3 parts; an upper arch and 2 basal lateral lobes which are broken in most of the specimens. The margin of the aperture is furnished with a thin plate-like lip, projecting in the direction of coiling. The diameter of the shell is 0.48 mm.

A lectotype was designed by Coxall & Pearson 2006:
"Shokhina illustrated a large number of H. liebusi syntypes that clearly represent the range of morphology exhibited by this taxon. Since no holotype was designated we herein select Shokhina’s (1937) text-fig. 2 as the lectotype of H. liebusi and text fig. 8 as the paralectotype (Pl.8.9, Figs. 1-2). Blow (1979) did not recognise H. liebusi and instead assigned Shokhina’s (1937) morphotypes either to H. mexicana sensu lato or H. dumblei. We consider H. liebusi to be a useful species that is morphologically and stratigraphically intermediate between H. mexicana and H. dumblei." [Coxall & Pearson 2006]

References:

Coxall, H. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of the Hantkeninidae (Clavigerinella, Hantkenina and Cribrohantkenina). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 8): 213-256. gs O

Shokhina, V. A. (1937). The genus Hantkenina and its stratigraphical distribution in the north Caucasus. Problemy Paleontologii, Paleontologicheskay Laboratoriya Moskovskogo Universiteta. 425-441. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Hantkenina liebusi Shokhina 1937

Hantkenina liebusi

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