Taxonomy
Robaszynski et al., 1979: Early representatives of M. schneegansi resemble somewhat Dicarinella hagni in having globose chambers and depressed radial sutures on the umbilical side. [copied from Chronos database]
Original description: A côte d'elle [G. sigali] se développe une autre espece très caractéristique, à une carène aussi, Globotruncana schneegansi n. sp. faiblement dissymetrique et dont les loges conservent une certaine globulosité; toutes les formes existent depuis celles à une carene jusqu'à celles à deux carenes franches, étroitement accolées.
Translated from French: (G.) schneegansi n. sp. occurs with (G.) sigali, another species characterized by its single keel. (G.) schneegansi has a slightly asymmetrical test profile and the surface of chambers are inflated on both sides. All intermediate forms exist between single-keeled to closely spaced double-keeled specimens.
Entries in the Catalog of original descriptions: Globotruncana schneegansi, Globotruncana lakrai
Emended description:
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | - |
sp chamber shape: | Crescentic | coiling axis: | Low-moderate | periphery: | Single keel | aperture border: | Thin porticus |
umb chbr shape: | - | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Raised | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 5.5-6.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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Marginotruncana schneegansi compiled by the pforams@mikrotax project team viewed: 25-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110339 Go to Archive.is to create a permanent copy of this page - citation notes |
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