Taxonomy
Original description: Test planispiral, more elongate than circular in equatorial outline, biumbilicate, involute, lobulate periphery angular in early part gradually becoming subangular to subrounded in final chambers, peripheral angle ornamented by coarse rugose knobs over early part, rugosity diminishing over later part; early chambers small and indistinct, angular-rhomboid increasing in size and globularity as added, 7-8 in final whorl; sutures indistinct, curved, raised and nodular in early part, becoming less ornamented between middle chambers, slightly depressed, more distinct and almost straight between final chambers; wall heavily rugose in early part becoming quite smooth on final 2-3 chambers; aperture indistinct, beneath rounded arched lip at base of final chamber, outline of lip extending to umbilicus on both sides, lips of former apertures circling the umbilical area.
Entries in the Catalog of original descriptions: Planomalina pulchella
Character matrix
test outline: | Subcircular | chamber arrangement: | Planispiral | edge view: | Compressed | aperture: | Equatorial |
sp chamber shape: | N/A | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Subtriangular | umbilicus: | Wide | periph margin shape: | Narrowly rounded | accessory apertures: | N/A |
spiral sutures: | N/A | umb depth: | Shallow | wall texture: | - | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 7-9 | N.B. These characters are used for advanced search. N/A - not applicable |
Most likely ancestor: Muricohedbergella wondersi - at confidence level 2 (out of 5). Data source: Huber et al. 2022.
Likely descendants: Planomalina praebuxtorfi;
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. ticinensis zone (101.92-103.94Ma, base in Albian stage). Data source: Huber et al. 2022
Plot of range and occurrence data:
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 Todd, R. & Low, D. (1964). Cenomanian (Cretaceous) Foraminifera from the Puerto Rico Trench. Deep-Sea Research. 11: 395-414. gsReferences:
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Planomalina pulchella compiled by the pforams@mikrotax project team viewed: 6-2-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110144 Go to Archive.is to create a permanent copy of this page - citation notes |
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