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Falsotruncana


Classification: pf_mesozoic -> Hedbergellidae -> Falsotruncana
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuenella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella,
Daughter taxa: (blue => in age window 0-800Ma)



Specimens which cannot be assigned to established species

Taxonomy

Citation: Falsotruncana Caron 1981
Rank: Genus
Basionym: Falsotruncana maslakovae
Type species: Falsotruncana maslakovae Caron, 1981

Original description: Test à trochospire basse, enroulement toujo urs senestre. Contour lobe. profil tronque par un bandeau peripherique imperfore marque parfois jusque sur les dernieres loges. borde par deux carenes pustu- leuses visibles au mains sur les trois permieres loges du dernier tour. Dans cer- tains cas, bandeau peripherique et carene pustuleuse sont nettement perfores. Ouverture principale ombilicale-extraombilicale presque peripherique, ourlee d'une levre etroite. Ombilic peu profond, evase, sans portici ni tegilla. Sutures ombilicales radiates et deprimees. Sutures spirales, radiates apeu arquees, deprimees. Chez certaines formes primitives, la surface des premieres loges (face spirale) est tres pustuleuse.

Entries in the Catalog of original descriptions: Falsotruncana

Distinguishing features: Test in low trochospiral coil, compressed, chambers petaloid, sutures radial, slightly curved, depressed on the spiral side, radial and depressed around the shallow umbilicus on the umbilical side, peripheral margin truncate to narrowly rounded, with imperforate carinal band bordered in the earlier chambers of the final whorl by two low pustulose keels, peripheral outline lobulate; wall calcareous, perforate, rare perforations may occur in the generally imperforate carinal band, surface of earlier chambers pustulose, especially on the spiral side; primary aperture interiomarginal, umbilical-extraumbilical, nearly equatorial, bordered with a thin lip but lacking portici or umbilical extensions.

Geological Range:
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian 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. 1-1059. gs


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Falsotruncana compiled by the pforams@mikrotax project team viewed: 23-2-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110101 Go to Archive.is to create a permanent copy of this page - citation notes



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