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Planoheterohelix


Classification: pf_mesozoic -> Heterohelicidae -> Planoheterohelix
Sister taxa: Braunella, Gublerina, Hendersonites, Heterohelix, Huberella, Laeviheterohelix, Lunatriella, Planoglobulina, Planoheterohelix, Praegublerina, Protoheterohelix, Pseudoguembelina, Pseudotextularia, Racemiguembelina, Rectoguembelina, Sigalia, Spiroplecta, Ventilabrella, Zeauvigerina,
Daughter taxa (blue => in age window 0-300Ma)









Specimens which cannot be assigned to established species

Taxonomy

Citation: Planoheterohelix
Rank: Genus
Synonyms:

Type images:

Original description: Planoheterohelix Georgescu & Huber, 2009:

Entries in the Catalog of original descriptions: Globoheterohelix; Planoheterohelix;

Short diagnosis: Test is moderate in size and has globular to subglobular chambers that are biserially arranged throughout and become reniform in some species. Proloculus diameters range from 12–72 mm and subsequent chambers increase in size at varying rates. Aperture is a symmetrical semicircular arch at the base of the final chamber. Sutures are depressed and form at an oblique angle to the central axis. Apertural structures vary but typically consist of symmetrical flanges or an imperforate apertural lip. Test wall is calcitic, ornamented with fine, continuous costae and is microperforate to finely perforate (pore diameter 5 0.6–3.2 mm).


Emended description: Test is moderate in size and has globular to subglobular chambers that are biserially arranged throughout and become reniform in some species. Proloculus diameters range from 12–72 mm and subsequent chambers increase in size at varying rates. Aperture is a symmetrical semicircular arch at the base of the final chamber. Sutures are depressed and form at an oblique angle to the central axis. Apertural structures vary but typically consist of symmetrical flanges or an imperforate apertural lip. Test wall is calcitic, ornamented with fine, continuous costae and is microperforate to finely perforate (pore diameter 5 0.6–3.2 mm).

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian 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:


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Planoheterohelix compiled by the pforams@mikrotax project team viewed: 21-10-2017

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AphiaID: 1034736 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



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