pforams@mikrotax - Planoheterohelix paraglobulosa

Planoheterohelix paraglobulosa


Classification: pf_mesozoic -> Heterohelicidae -> Planoheterohelix -> Planoheterohelix paraglobulosa
Sister taxa: P. globulosa, P. moremani, P. olssoni, P. papula, P. paraglobulosa, P. planata, P. postmoremani, P. praenuttallii, P. reussi, P. rumseyensis ⟩⟨ P. labellosa, P. sphenoides, P. stenopos, P. vistulaensis, P. sp.

Taxonomy

Citation: Planoheterohelix paraglobulosa (Georgescu & Huber, 2009)
Rank: Species
Basionym: Globoheterohelix paraglobulosa

Type images:

Original description: Test is biserial throughout. The large proloculus (31-56 microns) is followed by six to eight globular chambers, which increase slowly in size as added. Second chamber is smaller than the proloculus. Sutures are distinct, straight to slightly oblique, depressed. Aperture is an interiomarginal, low- to medium-high symmetrical arch bordered by lateral imperforate rims and an imperforate band in the central part. Chamber surface displays closely spaced continuous or discontinuous fine (2.5-3.3 microns) costae. Intercostal spaces are commonly narrower than the width of the costae. Test wall is calcitic, microperforate to finely perforate with pore diameter ranging 0.7-1.1 microns. Pores are intercostal or occasionally penetrate costae.

Entries in the Catalog of original descriptions: Globoheterohelix paraglobulosa


Emended description:


Morphology:

Wall type:

Size:

Character matrix
test outline:Elongatechamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:Imperforate bandaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. concavata zone (86.71-89.91Ma, top in Coniacian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Georgescu, M. D. & Huber, B. T. (2009). Early evolution of the Cretaceous serial planktic foraminifera (late Albian-Cenomanian). Journal of Foraminiferal Research. 39: 335-360. gs


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Planoheterohelix paraglobulosa compiled by the pforams@mikrotax project team viewed: 29-9-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110405 Go to Archive.is to create a permanent copy of this page - citation notes



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