pforams@mikrotax - Planohedbergella escheri

Planohedbergella escheri


Classification: pf_mesozoic -> Globigerinelloididae -> Planohedbergella -> Planohedbergella escheri
Sister taxa: P. aspera, P. circularis, P. escheri, P. impensa, P. messinae, P. multispina, P. prairiehillensis, P. subcarinata, P. ultramicra, P. yaucoensis

Taxonomy

Citation: Planohedbergella escheri (Kaufmann, 1865)
Rank: species
Basionym: Nonionina escheri Kaufmann, 1865
Synonyms:

Type images:

Original description: Test transparent, calcareous, smooth, strongly compressed, elongate-rounded on the wide side and more or less lobate. Five to six arched chambers surround the first central chamber, which appears five or size-sided, dark, and of variable size. The last and, at times, the second last chambers are often distinctly inflated producing deep incisions between the chambers. Aperture is not visible. Structure is equally equal-sided.

Entries in the Catalog of original descriptions: Nonionina escheri, Globigerinella aissana, Hastigerina aspera digitata, Planomalina mendezensis, Globigerinelloides praevolutus


Emended description:

Georgescu & Huber, 2008, p.57:"Test planispirally coiled, biumbilicate, with 4.5 to 6.0 globular to subglobular chambers in the final whorl; chambers increase slowly in size as added. Sutures are straight, depressed and radial. Periphery broadly rounded, without peripheral structures. Primary aperture is a low arch, equatorial in position, extending into the umbilical areas. Relict apertures may be present in the umbilicus. Scattered pustules are present on all the chambers of the test. Test wall calcitic, hyaline, microperforate to finely perforate; pore diameters are in the range of 0.8 to 1.3 microns." [copied from Chronos database]

Morphology:

Wall type:

Size:

Character matrix
test outline:Lobatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:N/Aumb depth:N/Awall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Most likely ancestor: Planohedbergella aspera - at confidence level 3 (out of 5). Data source: Huber et al. 2022 fig. 2.
Likely descendants: Planohedbergella messinae; plot with descendants

Geological Range:
Last occurrence (top): within R. calcarata zone (75.71-76.18Ma, top in Campanian stage). Data source: Huber et al 2022
First occurrence (base): within D. concavata zone (86.71-89.91Ma, base in Turonian stage). Data source: Huber et al 2022

Plot of range and occurrence data:

References:

Georgescu, M. D. & Huber, B. T. (2008). Taxonomic re-evaluation and phylogeny of the stellate planktonic foraminiferal genus Hastigerinoides Brönnimann, 1952. Journal of Foraminiferal Research. 38: 52-58. gs

Huber, B. T., Petrizzo, M. M. & Falzoni, F. (2022). Taxonomy and phylogeny of Albian–Maastrichtian planispiral planktonic foraminifera traditionally assigned to Globigerinelloides. Micropaleontology. 68(2): 117-183. gs

Kaufmann, F. J. (1865). Die Zeit der kreidebildung: Die Polythalamien des Seewerfaltes, des Gault und Schrattefaltes. In, Heer, O. (ed.) Die Urwelt der Schweiz. F. Schulthess, Zurich 1-198. gs


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Planohedbergella escheri compiled by the pforams@mikrotax project team viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110132 Go to Archive.is to create a permanent copy of this page - citation notes



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