pforams@mikrotax - Planohedbergella subcarinata pforams@mikrotax - Planohedbergella subcarinata

Planohedbergella subcarinata


Classification: pf_mesozoic -> Globigerinelloididae -> Planohedbergella -> Planohedbergella subcarinata
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 subcarinata (Bronnimann, 1952)
taxonomic rank: species
Basionym: Globigerinella messinae subcarinata Bronnimann, 1952
Synonyms:

Type images:

Original description: The small, compressed and planispiral test has a lobate outline. The adult volution is composed of 5, rarely 6, much-compressed, subcarinate chambers. The last whorl is semi-involute, exposing in the shallow umbilici parts of the earlier chambers. The chambers are separated by rather deep and straight sutures. The end chamber is occasionally not larger or even smaller than the penultimate one. The outline of the individual chambers is elongate-ellipsoid in apertural and subcircular in lateral view. Early ontogenetic chambers are rounded peripherally, similar to those of the subspecies Globigerinella messinae subsp. messinae Bronnimann. The large arcuate aperture is situated equatorially at the base of the end chamber and is provided with a delicate, indistinct lip-like projection. The walls appear to be thin and finely perforate. Minute papillae are evenly distributed over the surface. The ornamentation is stronger in the early stage of the last volution."

Entries in the Catalog of original descriptions: Globigerinella messinae subcarinata

Character matrix
test outline:Quadratechamber arrangement:Planispiraledge view:Compressedaperture:Equatorial
sp chamber shape:N/Acoiling axis:N/Aperiphery:-aperture border:Thin lip
umb chbr shape:Petaloidumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:N/Aumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

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

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: Huber et al 2022

Plot of range and occurrence data:

References:

Brönnimann, P. (1952c). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. gs

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

Huber, B. T., Tur, N., Self-Trail, J. & MacLeod, K. G. (2022a). Calcareous plankton biostratigraphic fidelity and species richness during the last 10 m.y. of the Cretaceous at Blake Plateau, subtropical North Atlantic. Cretaceous Research. 131: 1-42. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O

Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs O

Missing or ambiguous references: ;


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Planohedbergella subcarinata compiled by the pforams@mikrotax project team viewed: 25-7-2024

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Maria Rose(Italy)
THANK YOU SO MUCH!!!