pforams@mikrotax - Leupoldina pustulans

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Leupoldina pustulans

Classification: pf_mesozoic -> Schackoinidae -> Leupoldina -> Leupoldina pustulans
Sister taxa: L. cabri, L. hexacamerata, L. pustulans, L. quinquecamerata, L. reicheli, L. sp.

Cismon-348.JPG

Taxonomy

Citation: Leupoldina pustulans (Bolli, 1957)

Rank: Species

Basionym: Schackoina pustulans pustulans Bolli, 1957

Taxonomic discussion: This species displays a rather wide variability regarding the number of chambers (4 to 6); a more marked morphological variability concerns (a) the shape of the chambers in the last whorl that ranges from subglobular or pyriform in the first chambers to pyriform, digitiform or tubular in the outer ones, (b) the presence/absence of bifurcation in the last chambers, leading to bear one or two ampullae per chamber, and (c) the degree of constriction that separates the ampullae from their respective chambers, abrupt to barely marked. In general, well-separated ampullae are associated with pyriform chambers, whereas in cylindrically shaped chambers constrictions are almost absent. [copied from Chronos database]

Type images:

holotype: S. pustulans pustulans

Original description: Shape of test. - Early stage possibly very slightly trochospiral (usually not recognizable), later becoming planispiral, stellate. Wall. - Calcareous, finely perforate. Chambers. - Early chambers globular to subglobular, becoming more and more elongated ; the four chambers of the last whorl each with a bulb-or bubble- shaped extension (often broken off). Sutures. - Radial, depressed. Aperture. - An interiomarginal, equatorial arch bordered by a lip; in position often slightly asymmetrical to the equatorial plane.

Entries in the Catalog of original descriptions: Schackoina pustulans pustulans

Geological Range:
Last occurrence (top): within G. ferreolensis zone (122.17-122.98Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within L. cabri zone (123.89-125.71Ma, base in Aptian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Leupoldina

Character matrix

test outline:	Stellate	chamber arrangement:	Pseudoplanispiral	edge view:	Compressed	aperture:	Equatorial
sp chamber shape:	Elongate	coiling axis:	Very low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Elongate	umbilicus:	Narrow	periph margin shape:	Narrowly rounded	accessory apertures:	Relict
spiral sutures:	Strongly depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	4.0-4.5	N.B. These characters are used for advanced search. N/A - not applicable

References:

Bolli, H. M. (1957c). The foraminiferal genus Schackoina Thalmann, emended, and Leupoldina, n. gen. in the Cretaceous of Trinidad, B. W. I. Eclogae Geologicae Helvetiae. 50(2): 271-278. gs V O

Leupoldina pustulans compiled by the pforams@mikrotax project team viewed: 5-3-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110311 Go to Archive.is to create a permanent copy of this page - citation notes

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