pforams@mikrotax - Planomalina praebuxtorfi pforams@mikrotax - Planomalina praebuxtorfi

Planomalina praebuxtorfi

Classification: pf_mesozoic -> Planomalinidae -> Planomalina -> Planomalina praebuxtorfi
Sister taxa: P. buxtorfi, P. praebuxtorfi, P. pulchella, P. sp.


Citation: Planomalina praebuxtorfi Wonders 1975
taxonomic rank: Species
Basionym: Planomalina praebuxtorfi

Type images:

Original description: "Test planispiral, rather deeply umbilicate, equatorial periphery subangular to angular, lobulate in outline, with either a keel or irregular rugosities or both, wich only occur on the earlier part of the last whorl. The last 2 or more chambers are unornamented. Sutures depressed, curved, bordered at their posterior side by more or less well-developed rugosities on the earlier part of the last whorl, thus giving the impression of being raised. At least the last suture remains unornamented. Chambers rounded triangular in apertural view, reniform in lateral view. There are 6-8, mostly 7 chambers in the last whorl, increasing gradually in size as added. Aperture an equatorial arch, interiomarginal in position, extending on either side into the umbilicus and backwards to the spiral suture, and bordered by a distinct lip. The lateral umbilical extensions of earlier apertures remain visible as relict apertures with their lips. Wall perforate, covered with small pustules, which, in the earlier part of the last whorl, tend to concentrate to form a keel and raised sutures."

Entries in the Catalog of original descriptions: Planomalina praebuxtorfi

Character matrix
test outline:Subcircularchamber arrangement:Planispiraledge view:Compressedaperture:Equatorial
sp chamber shape:Subtriangularcoiling axis:Very lowperiphery:Single keelaperture border:Thick lip
umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Narrowly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:7-10 N.B. These characters are used for advanced search. N/A - not applicable

Most likely ancestor: Planomalina pulchella - at confidence level 3 (out of 5). Data source: Huber et al. 2022.
Likely descendants: Planomalina buxtorfi; plot with descendants

Geological Range:
Last occurrence (top): within P. appenninica zone (100.50-101.92Ma, top in Albian stage). Data source: Huber et al. 2022
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian stage). Data source: Huber et al. 2022

Plot of range and occurrence data:


Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

Petrizzo, M. R. & Huber, B. T. (2006). Biostratigraphy and taxonomy of late Albian planktonic foraminifera from ODP Leg 171B (western North Atlantic Ocean). Journal of Foraminiferal Research. 36: 166-190. gs

Wonders, A. A. H. (1975). Cretaceous planktonic foraminifera of the Planomalina buxtorfi Group from El Burrueco , Southern Spain. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. 78(2): 83-93. gs


Planomalina praebuxtorfi compiled by the pforams@mikrotax project team viewed: 25-6-2024

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