pforams@mikrotax - Liuenella pforams@mikrotax - Liuenella


Classification: pf_mesozoic -> Hedbergellidae -> Liuenella
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuenella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella
Daughter taxa (time control age-window is: 0-800Ma)
Liuenella falklandica

Liuenella globigerinellinoides

Liuenella punctata

Liuenella sp.

Liuella sp.
Specimens which cannot be assigned to established species


Citation: Liuenella  Georgescu 2010
taxonomic rank: Genus
Type species: Liuenella falklandica (Georgescu, 2008)
Taxonomic discussion: Liuenella nov. gen. differs from any other hedbergellid genus by presenting an imperforate peripheral band throughout the final whorl. It also differs from Clavihedbergella Banner and Blow of the upper Albian by its finely perforate to macroperforate test wall and lack of radially elongate chambers. Seemingly, there is a gap that separates the stratigraphic ranges of the two genera and that spans the Cenomanian-early Santonian interval. Herein, Liuenella is included within the Subfamily Hedbergellinae—despite the presence of the imperforate peripheral band—due to the strong general resemblances with the hedbergellid group rather than with the ticinellids of the Subfamily Ticinellinae, such as Biticinella, Clavihedbergella, Claviticinella and Ticinella (Loeblich and Tappan, 1987, p. 466). Pore-size terminology is that used by the Mesozoic Planktonic Foraminifera Working Group (2006, coordinator B. T. Huber): 1.0 to 2.5 mm is considered finely perforate, and over 2.5 mm is considered macroperforate.

Original description:

Diagnosis. Smooth, very low trochospiral test, finely perforate  to macroperforate test wall, crater-like  pores on the earlier chambers  and imperforate  peripheral  band  throughout the final whorl.

Description. Test low to very low trochospiral with globular to  subglobular   chambers,  separated  by  straight,  incised  and radial sutures. Test biconvex, nearly symmetrical in edge view. Periphery broadly rounded with a wide imperforate  band throughout the final whorl. Main  aperture  is in the shape of a low to medium high arch, peripheral-umbilical in position  and bordered by an imperforate  lip. Test wall calcitic, hyaline, perforate, with perforation diameters  ranging between 1.7 and 3.1 mm. Test surface smooth.

Entries in the Catalog of original descriptions: Liuella, Liuenella

Distinguishing features:
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: Smooth, very low trochospiral test, finely perforate to macroperforate test wall, crater-like pores on the earlier chambers and imperforate peripheral band throughout the final whorl.

Geological Range:
Last occurrence (top): at top of G. ventricosa zone (100% up, 76.2Ma, in Campanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:


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

Georgescu, M. D. (2010a). Liuenella, new name for Liuella Georgescu, 2008. Journal of Foraminiferal Research. 40: 206-. gs


Liuenella compiled by the pforams@mikrotax project team viewed: 25-7-2024

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Comments (2)

Le Coze

Liuella Georgescu, 2008 is a junior homonym of Liuella Wang & Bai, 1992 (Arthropoda, Chelicerata, Arachnida) and was given the replacement name Liuenella in Georgescu, 2010




Jeremy Young(UK)

Thanks I will rename this