Catalog - Praeplanctonia globifera Catalog - Praeplanctonia globifera

CATALOG OF ORIGINAL DESCRIPTIONS: Praeplanctonia globifera 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 globifera
Other pages this level: P. globifera, P. quasiplanctonica

Praeplanctonia globifera

Citation: Praeplanctonia globifera Georgescu 2009
Taxonomic rank: species
Type specimens: HOLOTYPE: WKB 010010 PARATYPE: SEVEN SPECIMENS, WKB 010011
Type sample (& lithostrat): Sample 28-4, 66-69 cm.
Type age (chronostrat): Upper Albian (upper part of the P. ticinensis Biozone)
Type locality: Western North Atlantic Ocean (Blake Plateau), ODP Leg 171B, Site 1050C. Geographical coordinates: 30o 05’ N, 76o 14’ W.
Type repository: Alberta; Willi Karl Braun Micropaleontological Collection at the University of Calgary (Calgary, Alberta, Canada.)

Current identification:


Original Description

Description.– Test biserial throughout (Pl. 2, Fig. 7, Pl. 3, Figs 1, 2, 5, 6, 8, 10, Pl. 4, Figs 7, 8) or, occasionally, with a very short early triserial stage (Pl. 3, Fig. 12, Pl. 4, Fig. 1).
The test is twisted along the axis of growth at least in the earlier part. Proloculus is large, its maximum dimension ranging between 28 and 44 µm. Chambers are globular to subglobular, with little overlapping and slow and gradual increase in size. Aperture is elliptical and subterminal in position; it is bordered by an asymmetrical imperforate rim (Pl. 2, Fig. 8, Pl. 4, Figs 1, 2, 3, 6, 7) and provided with a toothplate. A supplementary suture is present on the apertural face of the last-formed chamber and it extends from the aperture base to the suture between the last-formed two chambers (Pl. 3, Fig. 2, Pl. 4, Figs 1-4, 6,7). Chamber surface is smooth. Test wall is calcitic, hyaline, nannoperforate; pores are elongate to circular in shape, their size ranging between 0.2 and 0.5 µm.


Size:
Dimensions of the holotype.– Length: L = 0.241 mm; width: W = 0.093 mm; W/L = 0.386; thickness: T = 0.067 mm; T/L = 0.278; proloculus diameter: PD = 0.035 mm

Etymology:
The species name reflects the globular to subglobular shape of the chambers.

Extra details from original publication


Remarks.– Praeplanctonia globifera differs from P. quasiplanctonica nov. sp. by having larger proloculus and lower rate of increase in chamber size during the ontogenetic development.


Diagnosis.– Species of Praeplanctonia with large proloculus and globular chambers, which increase slowly in size.

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 globifera compiled by the pforams@mikrotax project team viewed: 13-9-2026

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