Planomalina buxtorfi

Taxonomy

Original description: Conchiglia piatta dal contmmo tipicamente scafoide, avvolgimento planispirale, camere numerose, sottili, lunghe, arcuate, regolarmente e rapidamente crescenti, suture curve, orlate da fini listelli che girano tutto attorno alla camera stessa, biforcandosi sulle due faccie. Il margine stesso è pertanto nettamente unicarenato, l'apertura giace sulla faccia terminale dell'ultima camera; piccola arcuata, sembra prolugarsi un poco sulle due faccie laterali. L'ultima spira copre in parte il giro precedente; il centro è da ambo le parti un po' incavato, pochè i giri interni sono più profondi di quelli esterni. I listelli dell'ultima camera biforcandosi si allargano alquanto l'uno all'altro ed abbracciano una curva, triangolare, faccia terminale. La spira infine è alquanto aperta e tende ad estendersi nella tipica, sopramenzionata forma scafoide.
Numero delle camere all'ultimo giro 9-10 (eccezionalmente anche 11).  

Entries in the Catalog of original descriptions: Planulina buxtorfi, Planomalina apsidostroba

Emended description:

Most likely ancestor: Planomalina praebuxtorfi - at confidence level 3 (out of 5). Data source: Huber et al. 2022.

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): at base of P. appenninica zone (0% up, 101.9Ma, in Albian stage). Data source: zonal marker (from Timescale Creator)

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
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Planomalina buxtorfi, synonyms included - Planomalina aspidostroba; Planomalina buxtorfi;
• See also space-time plot :: Samples map :: Parent: Planomalina

Planomalina buxtorfi compiled by the pforams@mikrotax project team viewed: 7-12-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110413 Go to Archive.is to create a permanent copy of this page - citation notes

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