pforams@mikrotax - Planoheterohelix papula

Planoheterohelix papula


Classification: pf_mesozoic -> Heterohelicidae -> Planoheterohelix -> Planoheterohelix papula
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 papula (Belford, 1960)
Rank: Species
Basionym: Guembelina papula
Taxonomic discussion: In paratype D (tf. 3, fig. 3), a chamber, now broken off, has been developed to the side of the main biserial series of chambers; this is the only specimen observed showing any tendency to develop the fan-shaped test of Ventilabrella. Specimens which taper throughout
resemble Guembelina globulosa (Ehrenberg) [Textularia globulosa, 1840], but may be distinguished by the roughened early portion of the test. Guembelina glabrans Cushman has a roughened early portion, but the periphery of the early chambers has a slight keel. [copied from Chronos database]

Type images:

Original description: Diagnosis: Test 1½ to 2 times as long as broad, early portion rapidly broadening to maximum width, surface roughened. Chambers globular, sutures depressed, horizontal. Wall of test perforate, radiate in structure, aperture large.

Description: Test 1½ to 2 times as long as broad, early portion usually broadening rapidly to maximum breadth, sides of test then almost parallel, or sometimes narrowing over last one or two pairs of chambers; some specimens taper throughout. Median axis of the test usually straight, sometimes slightly curved. Central part of test depressed, periphery lobate. Chambers globular, inflated, sutures narrow, distinct, depressed, horizontal or only slightly inclined. Wall of test calcareous, finely perforate, radiate in structure; surface of test roughened on early chambers giving a pimpled appearance, last one or two pairs of chambers smooth. Aperture a large arched opening at the base of the inner margin of the chamber.

Entries in the Catalog of original descriptions: Guembelina papula


Emended description:


Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): within G. elevata zone (79.20-84.19Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (86.71-89.91Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix
test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Subrectangularcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Subrectangularumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:
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

References:

Belford, D. J. (1960). Upper Cretaceous foraminifera from the Toolonga Calcilutite and Gingin Chalk, Western Australia. Australia Bureau of Mineral Resources, Geology and Geophysics Bulletin. 57: 1-198. gs


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Planoheterohelix papula compiled by the pforams@mikrotax project team viewed: 29-5-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110404 Go to Archive.is to create a permanent copy of this page - citation notes



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