pforams@mikrotax - Gansserina repanda

Gansserina repanda

Classification: pf_mesozoic -> Globotruncanidae -> Gansserina -> Gansserina repanda
Sister taxa: G. gansseri, G. repanda, G. wiedenmayeri, G. sp.

Taxonomy

Citation: Gansserina repanda (Bolli, 1957)

Rank: Species

Basionym: Globotruncana repanda

Type images:

holotype: G. repanda
holotype: G. repanda
holotype: G. repanda

Original description: Shape of test a very low trochospiral, spiral side concave, umbilical side strongly inflated; equatorial periphery lobate, early chambers of last whorl with double keel, which may be absent in the ultimate and penultimate chambers. Wall calcareous, perforate; surface in well-preserved specimens slightly rugose, especially on the umbilical side. Chambers globular to hemispherical, twelve to fifteen, arranged in two to three whorls; the four chambers of the last whorl increase rapidly in size, earlier whorls small by comparison. Sutures on spiral side almost radial, depressed; on umbilical side radial, depressed. Umbilicus deep, wide. Primary apertures interiomarginal, umbilical; tegillia with accessory apertures not preserved in Trinidad material, but present in specimens of this species from the Gulf Coast. The twenty-five specimens counted all coiled dextrally.

Entries in the Catalog of original descriptions: Globotruncana repanda

Emended description:

Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.20-84.19Ma, base in Santonian 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: Gansserina

Character matrix
test outline: Lobate chamber arrangement: Trochospiral edge view: Planoconvex aperture: Umbilical
sp chamber shape: Petaloid coiling axis: Very low periphery: Double keel aperture border: N/A
umb chbr shape: Globular umbilicus: Narrow periph margin shape: Subangular accessory apertures: N/A
spiral sutures: Moderately depressed umb depth: Deep wall texture: Mod. Pustulose shell porosity: Finely Perforate: 1-2.5µm
umbilical or test sutures: Moderately 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. (1957e). The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper Cretaceous of Trinidad, B. W. I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 51-60. gs V O

Gansserina repanda compiled by the pforams@mikrotax project team viewed: 2-7-2022

Taxon Search:

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110113 Go to Archive.is to create a permanent copy of this page - citation notes

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test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical
sp chamber shape:	Petaloid	coiling axis:	Very low	periphery:	Double keel	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Subangular	accessory apertures:	N/A
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Mod. Pustulose	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.0-4.5	N.B. These characters are used for advanced search. N/A - not applicable