Catalog - Praeplanctonia quasiplanctonica Catalog - Praeplanctonia quasiplanctonica

CATALOG OF ORIGINAL DESCRIPTIONS: Praeplanctonia quasiplanctonica Georgescu 2009

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> P -> Praeplanctonia -> Praeplanctonia quasiplanctonica
Other pages this level: P. globifera, P. quasiplanctonica

Praeplanctonia quasiplanctonica

Citation: Praeplanctonia quasiplanctonica Georgescu 2009
Taxonomic rank: species
Type specimens: Holoype.– Specimen WKB 010015. Paratypes.– Five specimens, WKB 010016.
Type age (chronostrat): Upper Albian (upper part of the P. ticinensis Biozone throughout the upper part of T. appenninica Biozone).
Type locality: Western North Atlantic Ocean Blake Plateau) and Eastern North Atlantic Ocean (offshore Cape Bojador, Spanish Sahara).
Type repository: Alberta; Willi Karl Braun Micropaleontological Collection at the University of Calgary (Calgary, Alberta, Canada.)

Current identification:


Original Description

Diagnosis.– Species of Praeplanctonia nov. gen. with relatively smaller proloculus and lower rate of chamber increase in size.

Description.–Test twisted, small-sized with biserial chambers arrangement throughout (Pl. 4, Figs 14, 19, 20) or sometimes with a short triserial stage in the earlier part of the test (Pl. 4, Figs 9, 12, 13, 16, 17). Proloculus is relatively small, its diameter being between 11 and 14 µm.

Chambers are globular in the earlier part of the test, subglobular in the adult and increase slowly in size as added.

Sutures are distinct, depressed and straight to slightly curved. Aperture is elliptical in shape and subterminal in position; it is bordered by an asymmetrical and imperforate rim (Pl. 4, Fig. 10) and bears a toothplate (Pl. 4, Figs 16-20). Chamber surface is smooth. Test wall is calcitic, hyaline, nannoperforate with elongate to circular pores, pore dimension ranging between 0.2 and 0.5 µm (Pl. 4, Fig. 11).


Size:
Dimensions of the holotype.– Length: L = 0.224 mm;width: W = 0.095 mm; W/L = 0.424; thickness: T = 0.079 mm; T/L = 0.353; proloculus diameter: PD = 0.012 mm.

Etymology:
The name suggests the quasi-planktic appearance of this species.

Extra details from original publication

Remarks.– Praeplanctonia quasiplanctonica differs from any species of serial planktic foraminifera in the position of the aperture, which is subterminal and not interiomarginal and by having the aperture provided with a well-developed toothplate, which is absent in the planktics with serial chamber arrangement.

References:

Georgescu, M. D. (2009a). On the origins of Superfamily Heterohelicacea Cushman, 1927 and the polyphyletic nature of planktic foraminifera. Revista Española de Micropaleontología. 41: 107-144. gs


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Praeplanctonia quasiplanctonica compiled by the pforams@mikrotax project team viewed: 10-7-2026

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