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Helvetoglobotruncana


Classification: pf_mesozoic -> Hedbergellidae -> Helvetoglobotruncana
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella,
Daughter taxa (blue => in age window 0-300Ma)


Taxonomy

Citation: Helvetoglobotruncana Reiss 1957
Rank: Genus
Basionym: Globotruncana helvetica
Type species: Globotruncana helvetica Bolli, 1945

Type images:

Original description: Helvetoglobotruncana:

Entries in the Catalog of original descriptions: Helvetoglobotruncana;

Short diagnosis: Test in low trochospiral coil, planoconvex, spiral side flattened, umbilical side inflated, with narrow to moderately wide central umbilicus of about one-third to one-fourth the test diameter, chambers subtriangular, broad and inflated on the umbilical side, sutures radial and slightly depressed or may be elevated on the spiral side, peripheral margin marked by a row of pustules or a single keel, peripheral outline lobulate; primary aperture umbilical-extraumbilical, bordered by a well-developed flap or porticus, those of successive chambers overlapping in a ring about the umbilicus but do not fuse.

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 Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

References:

Loeblich, A.R., Jr. & Tappan, H. (Editors), (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York, 1059 pp.


Helvetoglobotruncana compiled by the pforams@mikrotax project team viewed: 30-3-2017

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