nmn

Leupoldina


Classification: pf_mesozoic -> Schackoinidae -> Leupoldina
Sister taxa: Leupoldina, Schackoina,
Daughter taxa: (blue => in age window 0-300Ma)





Specimens which cannot be assigned to established species

Taxonomy

Citation: Leupoldina Bolli 1957
Rank: Genus
Basionym: Leupoldina protuberans
Type species: Leupoldina protuberans Bolli, 1957
Taxonomic discussion: The genus and its constuent species is discused at length by Verga & Premoli Silva 2002

Type images:

Original description: Leupoldina Bolli 1957: Test free, early stage possibly slightly trochospiral, later planispiral, stellate, biumbilicate; early chambers globular to subglobular, chambers of last whorl elongate; some or all chambers of the last whorl with two or occasionally more long, tapering spines or bulb-shaped extensions symmetrically arranged on each side of the equatorial plane. Sutures depressed, radial; wall calcareous, perforate; surface smooth, pitted or hispid; aperture an interiomarginal, equatorial arch in the early stage, ultimate chamber with two interiomarginal, umbilical apertures, one on each side of the chamber. There are indications that in some specimens relict apertures may exist in the penultimate and possibly in earlier chambers of the last whorl.

Entries in the Catalog of original descriptions: Leupoldina;

Distinguishing features: Test irregular in form, in a low trochospiral coil, early chambers small and subglobular, then rapidly enlarging, becoming radially elongate and tapering distally, chambers of the final whorl clavate, the final one or two chambers commonly with two bulbous projections, one on each side of the median plane, sutures distinct, depressed; wall calcareous, perforate, surface smooth, pitted or hispid; aperture interiomarginal and equatorial, with a narrow bordering lip, final chamber may have an aperture at each side of the median plane.

Geological Range:
Last occurrence (top): within Aptian Stage (112.95-126.30Ma, top in Aptian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

References:

Loeblich, A.R. & Tappan, H., (1988). Foraminiferal Genera and Their Classification (Volume I-II)Van Nostrand Reinhold Co., New York, 1059 pp.

Verga, D. & Premoli Silva, I., (2002). Early Cretaceous planktonic foraminifera from the Tethys: the genus Leupoldina. Cretaceous Research, 23: 189-212.


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Leupoldina compiled by the pforams@mikrotax project team viewed: 18-10-2018

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110308Go to Archive.is to create a permanent copy of this page - citation notes



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