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

DSDP Site 356-328_b.JPG
Georgescu and Huber 2008_2f4-713.JPG
Georgescu and Huber 2008_2f7-328.JPG
Georgescu and Huber 2008_2f5-713.JPG
Georgescu and Huber 2008_2f6-713.JPG

Taxonomy

Citation: Planohedbergella escheri (Kaufmann, 1865)

Rank: species

Basionym: Nonionina escheri Kaufmann, 1865

Synonyms:

Globigerinella aissana;
Hastigerina aspera digitata
Globigerinelloides escheri (Kaufmann, 1865)
Planomalina mendezensis (Eternod Olvera 1959) = Globigerinelloides mendezensis (Eternod Olvera 1959)
Globigerinelloides praevolutus Petters 1977

Type images:

lectotype: N. escheri

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:

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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Planohedbergella

Character matrix
test outline: Lobate chamber arrangement: Planispiral edge view: Hourglass aperture: Equatorial
sp chamber shape: Globular coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Globular umbilicus: N/A periph margin shape: Broadly rounded accessory apertures: Relict
spiral sutures: N/A umb depth: N/A wall texture: Finely pustulose shell porosity: Microperforate: <1µm
umbilical or test sutures: Moderately depressed final-whorl chambers: 4.5-6.0 N.B. These characters are used for advanced search. N/A - not applicable

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

Planohedbergella escheri 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=110132 Go to Archive.is to create a permanent copy of this page - citation notes

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test outline:	Lobate	chamber arrangement:	Planispiral	edge view:	Hourglass	aperture:	Equatorial
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Broadly rounded	accessory apertures:	Relict
spiral sutures:	N/A	umb depth:	N/A	wall texture:	Finely pustulose	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.5-6.0	N.B. These characters are used for advanced search. N/A - not applicable