Marginotruncana sinuosa

Taxonomy

Original description: DIAGNOSE : Cette espèce est morphologiquement très semblable à Globotruncana fornicata PLUMMER, mais elle s'en distingue par la position de l'ouverture primaire qui est ombilicale-extraombilicale et non franchement ombilicale.

DESCRIPTION : Test calcaire hyaline perforé bilamellaire et enroulement trochospiralé. Ouverture primaire ombilicale-extraombilicale. Forme biconvexe, la face dorsale étant généralement plus convexe que la face ventrale. Bandeau carénal périphérique étroit, comportant deux carènes divergentes, étroitement accolées sur la partie postérieure des loges. Le plan de chacune des loges est décalé par rapport celui de ses voisines, ce qui donne g l'ensemble du test une allure contournée caractéristique. Cette disposition se traduit surtout par un aspect sinueux du bandeau carénat et par une ondutation de la surface du test sur Ia face spirale. Les loges sont très fortement étirées dans le sens de l'enroulement et prennent une allure imbriquée, nettement soulignée sur la face ventrale par le parcours sigmoide des bourrelets suturaux et périombilicaux. L'ombilic, relativement large, est en partie masqué par les expansions lamelleuses ("tegilla") issues de la partie adombilicale de chacune des loges; ces expansions ménagent entre elles des ouvertures accessoires infra et intralaminales.

Entries in the Catalog of original descriptions: Marginotruncana sinuosa

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 M. schneegansi zone (89.75-92.51Ma, base in Turonian 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
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Marginotruncana sinuosa, synonyms included - Contusotruncana fornicata manaurensis; Globotruncana fornicata manaurensis; Marginotruncana manaurensis; Marginotruncana sinuosa;
• See also space-time plot :: Samples map :: Parent: Marginotruncana

Marginotruncana sinuosa compiled by the pforams@mikrotax project team viewed: 17-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110342 Go to Archive.is to create a permanent copy of this page - citation notes

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Comments (3)

 

 

 

 

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Le Coze

Posts: 149

Since: Aug 2017

Le Coze

Inversed priority

19 September 2017 20:54

Jeremy Young

Posts: 559

Since: Jan 2017

Jeremy Young(UK)

another one for Brian's list

19 September 2017 21:22

Brian Huber

Posts: 14

Since: Aug 2017

Brian Huber

Globotruncana fornicata manaurensis moved out of sinuosa and now considered as a valid species of Marginotruncana.

26 September 2018 16:05

 

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